CN1892053A - Multi-layer movable wall fluid drag-reduction and propulsion device - Google Patents
Multi-layer movable wall fluid drag-reduction and propulsion device Download PDFInfo
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- CN1892053A CN1892053A CN 200610106732 CN200610106732A CN1892053A CN 1892053 A CN1892053 A CN 1892053A CN 200610106732 CN200610106732 CN 200610106732 CN 200610106732 A CN200610106732 A CN 200610106732A CN 1892053 A CN1892053 A CN 1892053A
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Abstract
The invention provides a fluid drag-reducing and propelling device with plural layers of active wall surfaces, able to reduce resistance to fluid, arranging one to plural layers of active wall surfaces able to circularly rotate on the surface of an object in the flowing direction of the fluid, where one to multiple active wall surfaces are arranged in the space formed by each layer of active wall surface, all the active wall surfaces moves with the fluid, reducing their relative speed to the fluid so as to reduce frictional resistance and energy consumption; by applying driving force to make the moving speeds of the active wall surfaces greater than that of the fluid, it can produce propelling force, able to reduce pressure difference between the two ends of the object and thus reducing shape resistance and making the frictional resistance disappear. And it can be widely applied to various drag reducing occasions of fluid.
Description
Technical field
The device that the present invention relates to reduce fluid resistance (resistance that contains surface friction drag, viscous pressure resistance and similarity) and have propulsion functions (pressurization function) concurrently.
Background technique
People seek when reducing the fluid resistance method for a long time, and attention was only concentrated in the past and was confined to type body aspect, promptly explored the streamlined aspect of object, and the design of air drag reductions such as present bullet train, guided missile, automobile still is parked in this stage.After founding boundary layer theory, through years development, drag reduction method roughly can be divided into four classes by the different approaches that reduces viscous resistance, one class is the local method that changes the boundary vicinity fluid, as Hovercraft technology, air lubrication technology, its drag reduction power potentiality are considerable, but realize that on whole borders the concrete technology and the technological measure of the displacement of the viscous fluid that viscosity and proportion all differ widely still are difficult to solve fully, popularization is had any problem, and is mainly used in traffic and mechanical engineering field at present.Two classes are by the change of boundary layer temperature and control, or by measure such as air-breathing to change the laminar boundary layer velocity flow profile to reduce viscous resistance, more in outflow area research application such as aviations, these are existing detailed the discussion in a large amount of monographs, and its drag-reduction effect is limited.Three classes are injected attached wall district drag reduction with the macromolecule thin liquid, can be used for crude oil, water or other fluid drag reduction, but high molecular polymer costs an arm and a leg, and easily lost efficacy when being subjected to shearing force, and drag-reduction effect are limited.Four classes are to adopt suitable border material (elastic material) to make the border fully submissive, so that it easily produces dynamic response, vibrate with laminar flow boundary layer T-S wave-wave is moving, and this is grown up by bionics Study, but its drag-reduction effect is still limited.Reduce profile drag and then still rest on the streamline molded lines aspect of exploring object basically, it is exactly to be arranged that by the drag reduction interior of articles passage connects initial and end portion that a kind of method is also arranged, make fluid be discharged into the rear end by front end through passage, thereby reduce the front end and back end pressure difference and reduce viscous pressure resistance, but passage surface friction drag is bigger, thereby has influenced drag-reduction effect.Also having a noticeable method is to allow the interface of object move along with fluid motion, this discovery in one's early years has intuitively for a long time to be verified, but this method was not widely used afterwards, being almost people forgets, and the drag-reduction effect of its technological scheme is limited, so do not draw attention so far.These drag reduction methods all have a large amount of argumentations in various drag reduction mechanics textbooks and monograph; Present all kinds of advancing means (pressurization device) then mainly provides propelling force or pressure, and does not have what relation with the minimizing fluid resistance.
Summary of the invention
The objective of the invention is to propose a kind of and fluid and make the damping device of the object of relative movement, this device is drag reduction efficiently, and can be widely used in the fluid drag-reduction in fields such as water conservancy, aviation, navigation, sub aqua sport, communications and transportation, national defence, line transportation, and have propulsion functions (pressurization function) concurrently.
For achieving the above object, the present invention mainly adopts such technological scheme: lay the movable wall of one deck to the rotation capable of circulation of multilayer at the flow direction of the body surface longshore current body of need drag reduction, lay one in the space that every layer of movable wall surrounded and heavily arrive the movable wall of multiple rotation capable of circulation, make the moving wall of every layer of every taskwork with the fluid motion campaign, reduce the relative velocity of itself and fluid.
When the flow direction of the body surface longshore current body of need drag reduction is laid the movable wall of one deck rotation capable of circulation, the movable wall of the double at least rotation capable of circulation of the laying space that this movable wall surrounded in.
Further scheme is, the movable wall of rotation capable of circulation is applied driving force, make it with near so that surpass the speed motion of fluid motion speed.When the speed of the movable wall of outermost surface rotation capable of circulation during near liquid speed, both relative velocities are near zero, the resistance to motion of object in fluid will be near zero, and when the speed of the movable wall of outermost surface rotation capable of circulation during above liquid speed, will produce propelling force.
This device is applicable to the situation of outflow drag reduction (as the object that moves, as moving vehicle, aircraft, boats and ships etc.) in fluid, the situation of stream drag reduction (as transfusion, gas pipeline etc.) in also being applicable to.
Thereby the present invention is owing to arrange successively that at the body surface that needs drag reduction one deck, every layer of movable wall that is no less than a rotation capable of circulation that weighs separate interface with body surface at least, make its can with the fluid associated movement, and by human intervention with the near surface fluid displacement and its layering is flowed in order by certain way, each layer born certain relative velocity respectively, reduces even the eliminate fluid resistance with the speed motion that exceeds fluid motion speed even thereby interface can be reduced with the fluid relative velocity with less running resistance; A movable wall system is set between body surface and fluid in other words conj.or perhaps, often be provided with a device, and arrange one deck at least according to certain way, every layer is no less than the moving wall of a taskwork and bears certain relative velocity successively, and the inner space is replaced as the auxiliary drag reduction of fluid of lubricated and balance pressure effect, device can be along with the motion of fluid motion direction with the movable wall of fluid contacting side, after arriving end points, turn to and enter backhaul, from installing interior return to origin, finish a circulation, owing to born the role of interface at this moment with the movable wall of fluid contacting side, laminar boundary layer and laminar flow boundary layer produce at this, it is along with fluid motion direction motion has just reduced relative velocity between it and the fluid, thereby reduced the current gradient value that laminar boundary layer and laminar flow boundary layer are pressed close to boundary, the minimizing of the energy value that causes the minimizing of fluid opposite side interface shear stress and directly disperse by viscosity is exactly that surface friction drag reduces; In outflow drag reduction situation and part, flow in the drag reduction, as a kind of improvement, can be at the surface, inner passage and the multiple movable wall of object both sides arranging multiplayer that connect the object front end and back end, also changed the dynamic characteristic of top, afterbody fluid at the resistance of reducing friction, when increasing fluid dispatch amount, compare its pressure difference and reduce with not arranging preceding state, had the effect that reduces the viscous pressure resistance effect.When using drive unit when the active edges interface applies driving force and makes the interface movement velocity greater than liquid speed, thrust rating appears, negative pressure appears in the front portion simultaneously, malleation appears in the rear portion, thereby offset and the disappearance of fluid friction resistance with the part viscous pressure resistance, this shows that movable wall can have the function of propulsion device, pressurization device concurrently, though its mechanical efficiency and other propulsion device, pressurization device are more or less the same, but it can make the fluid friction resistance disappear, outside during stream mode and can reduce profile drag; And object top, afterbody increased side velocity to incoming flow and also can reduce the impact force of fluid to movable wall along the fluid motion direction or along helping movable wall that the fluid motion direction the arranges special arrangement with fluid motion and top layout this moment; Because movable wall device and object can be regarded an integral body as in the force analysis at this moment, fluid is exactly that fluid resistance to object reduces to the minimizing of movable wall resistance, object convection cell resistance reduces in other words, and the relative movement state of object and fluid and uninfluenced, all kinds of drag reduction processes are just accused and are finished.
Concrete technological scheme of this drag reduction scheme and drag principle thereof are:
1, arranges that on the wall of need drag reduction or body surface one can movable wall to multiple, multilayer, can think that the outermost surface wall that wherein contacts with fluid bears the interface effect, make mobilizable interface along with the motion of flow motion direction, reduce the relative velocity of interface and fluid, reduce and fluid between surface friction drag.When the outermost surface wall be interface speed equate with liquid speed be relative velocity when being zero the fluid friction resistance disappear.
For example apparatus of the present invention of wall are moved in one deck one taskwork of having only of a simple similar conveyor belt of certain fixed wall place layout under water, and its mantle of useing movable wall as can rotate with rotating cylinder and move, and fills fluid in the device and considers by water temporarily.As shown in Figure 1.
If current and fixed wall speed of related movement are V, then this device obviously can move under water current driven, and the mantle movement velocity is V when establishing its balance dress attitude
1, rotating cylinder bearing resistance and mantle twine that resistance is very little ignores (can take technical measures to reduce resistance) temporarily, then have: top water current driven R
fEquate with the surface friction drag of bottom and backhaul water, that is:
R
f=C
f1/2 ρ S (V-V
1)
2=C
f1/2 ρ V
1 2S * 3=3R
F1(S is a single face mantle area)
Can get (V-V
1)
2=3V
1 2, solve V
1=0.366V,
Then the surface friction drag of top current is:
R
f＝C
f.1/2ρS×(V-V
1)
2
＝C
f·1/2ρSV
2×0.634
2
＝0.402×C
f.1/2ρV
2S
And power loss is W=C
f.1/2 ρ S * (V-V
1)
3
＝0.255C
f.1/2ρV
3S
And as not add the drag reduction device resistance be C
f.1/2 ρ V
2S, power loss is C
f.1/2 ρ V
3S
Conclusion: movable wall can significantly reduce fluid friction resistance and energy loss.
2, the movable wall of rotation capable of circulation can be by arranging on the rotating cylinder that is wrapped in a plurality of runners, every pair of runner lays the movable wall of a heavy rotation capable of circulation, thereby in the space that it surrounded, arrange a heavy movable wall that reconstitutes one deck rotation capable of circulation at the most, turn to identical with the moving wall of each taskwork in one deck; Between first floor movable wall and the body surface, according to arrange a movable wall device to multilayer rotation capable of circulation, the movable wall switched in opposite of adjacent layer with method.
The movable wall of described rotation capable of circulation appended around the rotating cylinder that a plurality of runners are arranged in, the mode (as the mode of interior dress drive motor) that can take to connect with driving mechanism in the rotating shaft of at least one rotating cylinder drives the movable wall cycle rotation, becomes the driving rotating cylinder.
The layout of movable wall and circulation route are different and different with the drag reduction situation; Can find from force analysis, the device running resistance is mainly from frictional force between internal flow and the movable wall, for reducing this resistance, device inside can be evacuated in theory, resist exterior fluid pressure with contactless forces such as electromagnetic forces, but complex structures such as its motive sealing, the steering gear, involve great expense at present, and the motive sealing power consumption is bigger, and being evacuated to run into a lot of complicated problems, must adopt cautiously.So should be replaced as the little lubricated fluid of use of coefficient of viscosity under the general situation, adopt sealing or semitight state, and arrange multiple, the similar movable wall device of multilayer with the minimizing running resistance according to certain way in that device is inner, thereby increase drag-reduction effect greatly.As shown in Figure 2.
When interior stream drag reduction, the length of installation unit determines its starting point and endpoint location, movable wall is along with the motion of fluid motion direction, after arriving end points, turn to and enter backhaul, return to origin in the space between boundary layer and the body surface, finish a circulation, can arrange again in the space that movable wall surrounded that one arrives multiple similar movable wall to reduce running resistance, the multiple similar movable wall of arranging in the space that movable wall surrounded is called one deck temporarily, and is identical with moving its motion sense of rotation of wall of each taskwork of one deck; And the space that movable wall backhaul side and body surface surround can arrange again one deck to multi-layer movable wall to reduce running resistance, its motion sense of rotation of movable wall that each layer is adjacent is opposite; Thereby form the multiple movable wall of multilayer system.
As shown in Figure 4, though when outflow drag reduction situation, also can make similar arrangements with reference to interior stream drag reduction situation, but adopt following scheme much then simple: movable wall begins always to return cacumen by the object tail end again and to finish a circulation around to the object tail end from cacumen.Can arrange multiple movable wall according to same recycle circuit, because backhaul side liquid and the movable wall relative velocity is very big and resistance is very big, solution is to arrange the multiple movable wall of one deck accessory charactor at the object opposite side, this two-layer movable wall direction of rotation, its backhaul side is adjacent, resistance is minimum because movement velocity is similar, so only needs two-layer movable wall to meet the demands, and does not also get rid of the combination that other form is arranged because of actual demand certainly.
Then arrange just much simply for the object that rotates, need only arrange that multiple concentric drums class ring wall surface gets final product around its running shaft.
3, each of above-mentioned multiple movable wall layer, double wall face each other can be free movable, and do not produce or produce less contact friction during operation, each wall is born certain relative velocity respectively, generate certain velocity gradient successively, the motion of a plurality of speed much smaller than V resolved in the motion that a speed is V, though latter's speed sum still equals V, resistance and energy loss sum be much smaller than the former, application be a
2+ b
2＜(a+b)
2Principle; And the minimizing of each interlayer relative velocity can make the mobile in order minimizing reynolds' number of turbulent fluid trend and recover to laminar condition, the generation and the development of restriction whirlpool, thus drag overall and energy consumption are further reduced.The distribution principle of relative velocity was to make the suffered fluid resistance equal and opposite in direction in every double wall face two sides between each was heavy, and direction is opposite, (the identical and speed difference of fluid that each interlayer fills equates often), thereby consumption even needing no outside energy and keep the motion state balance less.The increase movable wall is heavy, the number of plies can increase drag-reduction effect, then continues to increase necessity heavy, the number of plies when fluid all reverts to laminar condition up between each wall.
As shown in Figure 3, with the flywheel drag reduction is example: a cylindric flywheel V rotation at full speed, its periphery is with n the concentric firm matter cylinder of thin-walled as multiple movable wall device, suppose that we put aside the influence of flywheel and each thin walled cylinder end, also ignore the influence of cylinder thickness and spacing and establish flywheel and the long-pending S that is of each layer cylinder inner and outer surface, then each layer cylinder can generate the velocity gradient of successively decreasing successively from inside to outside, and the relative velocity when establishing state of equilibrium between every layer is respectively Δ V
1, Δ V
2, Δ V
3Δ V
n, specific gravity is ρ between each cylinder.Get m layer cylinder and make force analysis, be subjected to two power effects, a driving force that is interior side liquid to it, size is C
f* 1/2 ρ Δ V
m 2S, another is the resistance of outer side liquid to it, size is C
f* 1/2 ρ Δ V
M+1 2S, two power equal and opposite in directions, direction is opposite, can derive Δ V
m=V
M+1All can derive such conclusion to each cylinder equally, also just can draw each layer relative velocity and be V/n, because each cylinder is considered by movement at the uniform velocity in state of equilibrium, the merit that inside and outside side liquid is done it is cancelled each other, and the not other in theory consumed energy suffered fluid friction power of flywheel so as can be known is C
f* 1/2 ρ S * (V/n)
2=1/n
2* C
f* 1/2 ρ V
2S, power loss is 1/n
3C
f* 1/2 ρ V
3S that is to say that the suffered surface friction drag of drag reduction rear flywheel and power loss are original 1/n in theory
2And 1/n
3The also available similar approach derivation of drag-reduction effect during plane motion (its process slightly), the power of the suffered fluid in the moving wall both sides of every taskwork equal and opposite in direction, direction basically is in the moving equilibrium state mutually on the contrary, and in force analysis, should be regarded as an integral body by drag reduction object and movable wall, then the suffered fluid resistance of object depends on movable wall that outermost surface contacts with fluid and the relative movement state between fluid, and three, four layers of (weight) movable wall can be reduced friction resistance more than 90% in theory.
Certainly, can unrestrictedly increase the removable wall surface layer in theory, tuple constantly increases drag-reduction effect, though but in fact fluid motion speed reduces, but still have a spot of energy dissipation when producing frictional force, fluid has certain kinetic energy rejection when turning to, there is resistance in the shaft bearing place, and (resistance can be by F when adopting mechanical bearing
t=0.005FTd
0/ D calculates, F
TBe the positive pressure of rotating shaft place, d
0And D is bearing bore diameter and rotating shaft diameter), the winding resistance when movable wall turns on rotating shaft, runner (is calculated as F by conveyor industry empirical correlation
1=9B (140+0.01F/B) d/D, wherein B is a width, F is a movable wall tension force, d is a movable wall thickness, D is a turning circle diameter, unit is newton, but be used for obviously bigger than normal herein), these all need fluid trend motive force makeup energy, even what charge into like this is fluid of the same race, the speed of its two side liquid also has small difference when the power of the suffered fluid in movable wall both sides equates, provides a side of driving force to be a bit larger tham opposite side, and this has a qualification the highest with regard to the increase that makes removable wall surface layer, tuple.These resistances are that main low speed occasion can account for certain proportion at gas, and are very little at other occasion proportion, so can ignore during theory analysis.
4, be replaced as lubricated at the active edges interface and in and keep the little fluid of coefficient of viscosity that pressure balance is used by the space between the fixed wall of drag reduction or the body surface, and make its sealing or be in semi-closed state, to reduce running resistance, also can be evacuated under some situation, and electromagnetic force and so on contactless force opposing hydrodynamic pressure is set.It is lubricated that to select principle for use with fluid be generally to select the fluid that coefficient of viscosity is little, density is little, if by drag reducing fluid is gas, gases such as then first-selected hydrogen, helium, (but if then seal request strictness of hydrogen of choosing danger and so on), if by drag reducing fluid is liquid, then select the fluid that coefficient of viscosity is little, lubrication is arranged, as macromolecule polymer solution etc.As select for use gas then should note keeping the balance of air pressure and hydraulic pressure.Also can charge into fluid of the same race under a lot of situations.
5, movable wall can so that its easily produces dynamic response, vibrate with laminar flow boundary layer T-S wave-wave is moving with certain flexible material is arranged, and increases drag-reduction effect, and its principle is identical with the 4th kind of method in the background technique.
6, when reducing viscous pressure resistance (mainly being to flow in the drag reduction in outflow drag reduction situation and the small part), as a kind of improvement, the multiple movable wall of inner passage surface arrangement multilayer that connects the object front end and back end, also changed the dynamic characteristic of top, afterbody fluid at the resistance of reducing friction, when increasing fluid dispatch amount, compare its pressure difference and reduce with not arranging preceding state, the existing effect that reduces the viscous pressure resistance effect that increases.When using drive unit when the active edges interface applies driving force and makes the interface movement velocity greater than liquid speed, thrust rating appears, and (can partly replace angle of rake function), negative pressure appears in the front portion simultaneously, and malleation appears in the rear portion, thereby offsets with viscous pressure resistance.Equally, the object both sides also can be considered the passage that does not seal, both side surface arranges that movable wall can make the fluid friction resistance greatly reduce, make the movable wall movement velocity greater than the time when applying driving force by drag reducing fluid speed, the fluid friction resistance disappears, thrust rating also appears on the contrary, negative pressure appears in the front portion simultaneously, malleation appears in the rear portion, thereby offset with viscous pressure resistance, also can add other fluid exhaust device and accelerate speed of fluid delivery, when fluid dispatch speed reaches certain critical value (should be the product of certain undetermined coefficient and object cross-section area and speed), profile drag disappears, and continues to strengthen dispatch speed and corresponding " the sticking thrust of pressing " then occurs.
7, push up at object, afterbody arranges that along the fluid motion direction or along helping the fluid motion direction movable wall also can reduce the impact force (be profile drag) of fluid to object, to consider during layout to make it meet streamlined principle, and can be unlikely to produce excessive sudden change along sliding the binding, reduce angle between itself and object major axis to reduce impact force that mechanical shock directly brought and the energy of dispersing as far as possible, appoint a part of getting on this movable wall to analyze, each inclined-plane all can be decomposed into two planes, a vertical surface that is perpendicular to the fluid motion direction, one is the horizontal plane that is parallel to the fluid motion direction, two faces all along the fluid motion direction backward and to object two lateral movements, thereby vertical surface backward decreased locomotion reduced the impact force (being profile drag) of fluid with the relative velocity of fluid, then its frictional force will be fluid row to both sides to two lateral movements; Horizontal plane decreased locomotion has backward been eliminated the surface friction drag of convection cell even, also pushes fluid to both sides to two lateral movements; Arrange that in afterbody following current body moving direction movable wall then can import fluid the object tail end, thereby increase the pressure minimizing front end and back end pressure difference of fluid the object tail end; So the movable wall that the top afterbody is arranged not only can directly reduce fluid impact power and surface friction drag, and have the pump drainage fluid function concurrently and auxiliary drag reduction.The top fluid set up receive this holder gram equation and can find also to arrange that fluid arrives its momentum of two rear flank from the summit behind the movable wall reduces with kinetic energy change amount, that is to say the minimizing of energy consumption and resistance.
8, fluid produces profile drag to the object head impact, some is a surface friction drag in its tangible profile drag, promptly when being decomposed, object top surface liquid speed is parallel to the surface friction drag that is actually that the velocity component of flow surface causes as can be known, can eliminate with the method for arranging movable wall, and cause impact force perpendicular to the velocity component on surface, but this component is less, it is littler when the object nose shape meets the streamline molded lines for dragon, apply a side velocity to incoming flow and just can reduce and even eliminate velocity component perpendicular to body surface, make the velocity vector direction parallel with the surface, make profile drag be converted to surface friction drag, arrange the movable wall resistance of reducing friction again, thereby reduce profile drag.For head relatively the object (being sharp type) of taper as the high-speed aircraft head can use improved propeller-like mechanism that incoming flow is applied side velocity (as shown in figure 16), but its " blade " plane with come flow path direction substantially parallel, thereby make profile drag very little, make incoming flow produce side velocity during the blade rotation, simultaneously at centrifugal masterpiece around fluid is thrown toward down, successively cloth one or more, thereby reduce the mechanical shock of fluid to the object top; Then can add one at the movable wall place for the more flat situation of head and come to apply side velocity to fluid to multilayer scraping blade class mechanism, when movable wall speed is spent less than flow velocity, note protecting scraping blade thin wing edge direction to incoming flow to reduce the caused profile drag of scraping blade itself.
The realization such scheme can be designed specific device according to its main points and go to implement, the method of arranging movable wall at body surface is a lot, its major character of the technological scheme of device of the present invention is that device and fluid contacting side are provided with multiple mobilizable wall, can reduce and the fluid relative velocity with the fluid motion campaign; When applying driving force its with can be surpassed fluid motion speed by the speed of related movement of drag reduction object, thereby eliminate fluid surface friction drag and reduce profile drag.
Apparatus of the present invention are installed between the body surface and fluid that needs drag reduction, with using situation different and by different forming and compound mode, but can be divided into following several sections basically: movable wall mechanism, steering equipment, a shell and a retaining device, sealing mechanism, in fill lubricating fluid and other assisting agency etc., and but Yian dress arts demand is divided into a plurality of measure-alike or different installation units, the composition of each unit is basic identical, and the organic assembling of each unit just constitutes a complete movable wall system and device.
Extremely shown in Figure 12 as Fig. 5, movable wall mechanism is meant the mantle class A of geometric unitA that can make the same shuttling movement of similar conveyor belt in this device, it is the main execution member of implementing drag reduction method, can have than the material of high-tensile or fabric etc. by nylon, rubber-like and make (also having resistant to elevated temperatures requirement sometimes), and has certain elasticity, easily produce dynamic response, can vibrate with laminar flow boundary layer T-S wave-wave is moving; Its proportion is set to identical or approaching with the institute contacting fluid, to reduce the unfavorable load that weight own causes, and cover the little teflon class self lubricating material of friction factor outward, to reduce the frictional force (more special when being gas) that is in contact with one another when adjacent movable wall moves and produces by drag reducing fluid; With installation unit and under layer, tuple determines parameters such as its length, width, as turning to its width direction of situation that needs to be arranged to leave certain amount of tension for having; Both sides are provided with the sideband of the very strong tensile strength of having of two imitative drive belt design, two-sided external application high strength friction material along its length, sideband twines on " runner " that is overlying on steering equipment, can with " runner " rotate move and with movable wall member associated movement; The movable wall member also can need to lay some special materials because of function of use, push away the power of current drainage body when increasing outflow or can not drive movable wall when the too little and flow velocity of fluid density is low during stream in preventing as the outermost surface movable wall and also can arrange that thereby rough surface and even scraping blade and so on pantagraph current collector accepts fluid energy and drive each movable wall, or the increase row of pushing away ability; Thicken wall or add deposited wire-core rope and so on reinforcement for increasing movable wall rigidity, add deposited thin rod and so on for resisting unbalanced pressure, also can be and to utilize electromagnetic force to drive or balance external force and lay lead or compound magnet material etc., for example be to be in contact with one another when preventing adjacent movable wall operation, can paste on relative movable wall surface, the homopolarity magnet of placement of flexible composite plastic magnetic or rubber magnetic stripe and so on produces repulsion, even contact friction is inevitable also very little because of positive pressure and the little frictional force that is produced that makes of friction factor; And the protruding magnetic stripe of arranging according to certain way also can prevent the movable wall sideslip, plays the effect of location and sealing, and can resist the unfavorable load that gravity causes.When the movable wall fluid in contact is gas, the weight of movable wall will make it produce bigger sag, though can rest be set or rotating cylinder gives support every a segment distance, but rest or rotating cylinder will increase contact friction, and additionally produce profile drag, and wayward installation thickness is also established the magnetic device so can lay magnetic substance in movable wall on object Gu Bi, it is fixed that spacing and magnetic intensity should be come through the strictness measuring and calculating, in order to eliminate the influence that gravity causes with electromagnetic force.
Steering equipment orders about, thereby the mechanism that assists movable wall member converting motion direction to finish shuttling movement, generally form by rotating cylinder and subsidiary body thereof, rotating cylinder is by rotating shaft and bearing and support and be fixed on and be arranged in order one of symmetric arrangement in the rotating shaft and to many circular rotary wheel constituted, just as driving belt in the belt drive unit is wound on the belt wheel, sideband on the movable wall is wound on the runner, runner structure is also very similar to the belt wheel of transmission device, the fluted sideband sideslip that prevents on the outer perimeter, the runner number is by the tuple decision of this layer movable wall, the runner of different radii has determined to cover the relative velocity between thereon the moving wall of each taskwork on the rotating cylinder, every layer of two ends arrange that a pair of rotating cylinder promptly meets the demands substantially in the interior stream drag reduction, twine respectively thereon again and cover multiple movable wall formation one deck, the scheme definite according to drag reduction method, the space that movable wall backhaul side and body surface surround can be used with quadrat method again and arrange that one deck is to multi-layer movable wall, its motion sense of rotation of movable wall that each layer is adjacent is opposite, for controlling the relative velocity between each layer, can establish a belt wheel in addition in the rotating shaft of the every layer of rotating cylinder outside, control relative velocity between each layer thereby each belt wheel interacts with mechanical drive modes such as belt transmission; The compound mode that the device of outflow situation is also determined according to drag reduction method equally arranges that the device of accessory charactor is positioned on the object two side portions and is positioned on the object top section and also can be installed separately, and also can make a recycle circuit and install; Thereby form the multiple movable wall system and device of multilayer.
Establish the driving rotating cylinder for driving outermost surface wall generation thrust, mode such as dress drive motor etc. drives and is the driving rotating cylinder in taking in its rotating shaft, motor driving is the technology of comparative maturity in the conveyor industry, does not also get rid of certainly otherwise to drive, and for example mechanical drive mode transmits kinetic energy; Driving rotating cylinder can arrange along the outermost surface movable wall, determines as required to arrange number and position, does not arrange and be not confined to the movable wall turning point.
Sometimes because of the rotating cylinder diameter more greatly take in sail wall install total thickness when avoiding outflowing caused profile drag and in reduce effective overflow section area during stream and be provided with and turn to rotating cylinder, unfixing between runner on it and the rotating shaft, can rotate freely but be equipped with bearing, radius is more or less the same between each runner, perfect condition is the spacing that is substantially equal to two adjacent movable walls, the sideband of movable wall is staggered successively being wound on each runner that turns to rotating cylinder after rotating cylinder turns to, thereby make the thickness minimizing is installed.
Space between each layer is replaceable for the fluid that lubricates and keep the pressure balance effect is arranged, it is lubricated that to select principle for use with fluid be generally to select the fluid that coefficient of viscosity is little, density is little, if by drag reducing fluid is gas, gases such as then first-selected hydrogen, helium, but if then seal arrangement is strict for hydrogen of choosing danger and so on, if is liquid, then select the fluid that coefficient of viscosity is little, lubrication is arranged, as macromolecule polymer solution etc. by drag reducing fluid.As select for use gas then should note keeping the balance of air pressure and hydraulic pressure, especially the vertical surperficial position of device of useing movable wall as should add special arrangement or through the special design balance that just can keep-up pressure, for example can in movable wall, broad ways lay thin steel rod or waddy and so on to strengthen the ability of the unbalanced pressure of opposing liquid, transverse baffle is set in the air chamber it vertically is separated into a plurality of separate little air chambers, carry out the motive sealing design between baffle plate and the movable wall, each little air chamber all keep certain force value (often equal this air chamber point midway outside liquid pressure and in making the outside pressure sum equate), the unbalanced hydrodynamic pressure of air chamber small in ends is then to arrange that methods such as permanent magnetism material produce electromagnetic force and come balance up and down, or by pushing away that the specially designed sealing mechanism of the present invention produces, pulling force gives balance, these have used for reference the technology of air cushion conveyer to a certain extent, also can consider in some sport equipment with the inhomogeneous fluid pressure of magnetic levitation technology balance.The variation in pressure that runs in the running is general to be considered its volume with pressure to be changed the lubricating fluid sealing and change, thereby produce opposing pressure and give balance, also can imitate spiral labyrinch seal as sideband and the first-class position of positioning convex strip striped is set, thereby on may command, become the non-contact motive sealing during lower wall surface position, with common one or more airtight or hemi-closure spaces of forming such as rotating shaft and shell, strengthen each wall rigidity simultaneously, default initial tension, increase the rotating cylinder number, dwindle the installation unit size and set up the electromagnetic force resisting apparatus and measure such as hydrodynamic pressure compensation device all can improve the ability that the opposing external pressure changes; The suffered impact force of movable wall of object top layout during as for outflow, should strengthen the rigidity of outermost surface wall, set up rotating cylinder, and the outermost surface wall is provided with recycle circuit separately in this part of tip position, the a chain of arrangement of a plurality of rotating cylinders also can be set directly keep out fluid impact (the rotating cylinder double as movable wall and the drive unit of rotation), thereby make this partial cancellation outermost surface movable wall become special case.Acutely cause fluid volume to change under the situation of violent (what especially charge into is gas) in some variation in pressure, can cancel sealing and make extraneous fluid be easy to enter as far as possible, thereby keep pressure balance.
The object top applies the mechanism of side velocity or pump drainage fluid to incoming flow, can select improved propeller arrangement as required for use or lay scraping blade and blade etc.
About the design of sealing mechanism with select for use, the width direction seal arrangement mainly arranges with the movable wall intersection that along a shell or a rib edge it is selected for use with general motive sealing design and is as good as; Sealing along its length generally is located between the outermost movable wall and movable wall that movement velocity is identical and adjacent between each installation unit, (also sealing can be set between the internal layer movable wall in case of necessity), in the movable wall in the sideband outside, lay the strong ferromagnetic substance of penetrating power, external application and the sealing identical or close material of packing ring, (also can directly paste the compound magnetic of rubber magnetic stripe and so on), when two adjacent movable walls arrival start positions are adjacent to each other, magnetic substance on two movable walls is attracted each other, and generation suction closes up automatically and packing washer class material forms sealing, when direction is moved separately, destroy respectively when moving to end two movable walls at the tension lower seal, reaction is more rapidly in its process, this situation appears in so mutual circulation, that is to say that sealing is the knot that can be undone by a pull formula, can draw back as required or synthetic; Also can become the mechanical interlocking open/close device in the less demanding occasion of reaction velocity with reference to the chain stretching device principle design.If what fill in the device is not allow leakage hydrogen gas and so on hazmat, then obturator is strict, even can consider magnet fluid sealing etc., if allow the fluid of part leakage rate, then adopt general Seal Design also can, in many cases in outer fluid be identical, then the sealing can cancel.Sealing mechanism is except that formation relative closure space makes the unlikely escape of lubricating fluid and prevents that impurity from entering, also can strengthen contact by the movable wall of its connection, make it to form airtight relatively space, certain stability is arranged, possess the ability of certain opposing unbalanced force.
Sometimes this device is pacified convenient for the processing system or is prevented that lubricating fluid is provided with shell to needs such as body surface corrosion, steering equipment and shell and shell and can be as required determined flexibly by the means of fixation of drag reduction body surface sometimes can be cancelled the part shell and replaced by body surface.End enclosure also can be resisted the impact that turns to fluid opposite end portion, does not have the ground of shell opposing fluid impact power that the centrifugal force that produces when a retaining comes the balance fluid diverting can be set at the movable wall steering position sometimes.
As the drag reduction and the propelling occasion of Aeronautics and Astronautics aircraft, can adopt high-speed electric expreess locomotive to drive under the very high situation of movement velocity, rotating shaft this moment is equivalent to a high-speed electric main shaft, can adopt the correlation technique of high-speed electric main shaft.Also can adopt the electromagnetic force driving mode and movable wall is implemented driving, arrange in movable wall that promptly wire netting or lead pass to electric current or make it produce induction current, and the mode that adds electromagnetic field on device drives the movable wall motion (as shown in figure 17) of rotation capable of circulation.This mode is identical with the linear electric motor working principle, this moment, movable wall was equivalent to the secondary of linear electric motor, and the device that adds electromagnetic field is equivalent to the elementary of linear electric motor, movable wall produces thrust and also directly passes to object and no longer bearing and the support transmission by rotating shaft by elementary, turning point also can be put and arranged that elementary the stator class mechanism of high-speed motor (or be similar to) assist it to turn to locating shell and gear, also available magnetic suspension of transverse force even superconductor technology under the situations such as rotating shaft place starting or brake give balance and location, rotating shaft and runner also can be set on the movable wall elementary or secondary even respectively, for example arrange in rotating shaft that lead produces induction current, thereby control the situation such as stressed of the moving wall of each taskwork by the electric current of cloth in the lead that the runner and the control system may command on the sideband of conduction imports movable wall, concrete ins and outs are with reference to techniques of linear motor.Control the moving wall of each taskwork and fluid and by the relative velocity of drag reduction object certain value with interior (as being no more than velocity of sound) thus can prevent that shock wave from producing the elimination shock wave drag, occur but locate still to have shock wave, during specific design corresponding consideration and layout should be arranged at moving object top and rotating shaft and rotating wheel etc.Advance situation also can use this type of promotion program in low occasion of speed such as drag reductions such as boats and ships, submarine, also can be in seawater in conjunction with technology such as electromagnetic fluid propellings, it has features such as power is big, starting is fast, capacity usage ratio height, but equipment has high input the technical requirements height.
Also have in addition such as the safe operation mechanism for monitoring, various kinds of sensors and control wiring, various cowling mechanism, assisting agencies such as lubricating fluid supplementary mechanism and pressure compensation balanced controls also are this device important component parts, these are all basic identical with prior art, have under the low-speed motion state partial content can be directly with reference to the related content of conveyor technology.
The present invention and device thereof are for the first kind method in the background technique, and it is equivalent to solve replacement technique and the technological measure of realizing the viscous fluid that viscosity and proportion all differ widely at body surface, thereby its considerable drag reduction potentiality are excavated; For second class methods, change interface and be easier to control flowing state transition, and each layer movable wall to bear certain relative velocity respectively energy consumption is greatly reduced, and the prospect of elimination shock wave drag is provided with the fluid relative velocity, drag-reduction effect is remarkable; For the 3rd class methods, it makes high molecular polymer reduce the possibility that is subjected to shear action and lost efficacy, and high molecular polymer costs an arm and a leg, for considering that thereby Economy often reduces implantation concentration and influences drag-reduction effect, the present invention then is fixed and does not make its escape, once drops into higher concentration and but can use for a long time during use, thereby saved expense, increased drag-reduction effect, and the present invention is not confined to fluid drag-reductions such as water and oil, application area is wider.With respect to the 4th class methods, the present invention has its drag reduction feature concurrently, and has absorbed the advantage of other method, thereby has more drag-reduction effect.For reducing profile drag, mainly be confined to the selection of streamline molded lines so far, the present invention is then on the basis that keeps streamline molded lines drag-reduction effect, from both sides or the inner passage arrange that movable wall reduces, the afterbody pressure difference, thereby drag-reduction effect is increased, and fairshaped top, tail surface are arranged movable wall again and added the mechanism that changes the speed of incoming flow direction vector has then further increased drag-reduction effect; And more be noted that, as the present invention during as the drag reduction driving tool, profile drag is reduced, the fluid friction resistance is disappeared, this is that present other any drag reduction method and propulsion device all can't be reached, and many occasion the present invention can consuming timely also reduce dry sound effectively in attenuating, so the present invention is a big breakthrough of fluid drag-reduction method.And the present invention the major applications occasion all be simple structure, cheap, system peace convenient, is beneficial to industrialization promotion, in each drag reduction field very application prospects arranged all.
Description of drawings
Fig. 1 is simple apparatus of the present invention drag reduction schematic representation;
Arranging multiplayer movable wall and circulation route schematic representation when Fig. 2 is internal flowing state;
Fig. 3 is the schematic representation that flywheel isospin transhipment animal body is arranged movable wall outward;
Fig. 4 arranges multiple movable wall and circulation route schematic representation when being outer stream mode;
Fig. 5 drives the rotating cylinder organigram;
Fig. 6 drives the rotating cylinder cross-section front view;
Fig. 7 turns to the rotating cylinder organigram;
Fig. 8 turns to the rotating cylinder cross-section front view;
Thereby Fig. 9 is a movable wall reduces the schematic representation that thickness is installed by turning to rotating cylinder to turn to;
Figure 10 is the schematic representation of sticking flexible location magnetic stripe on the movable wall;
Figure 11 is the schematic representation of each layer rotating cylinder by belt drive unit control relative velocity;
Figure 12 is the movable wall organigram;
Figure 13 is that each installation unit of embodiment's 1 PetroChina Company Limited.'s transport pipe drag reduction is divided and the position concerns schematic representation;
Figure 14 is that the canal for water conveyance installation unit is divided signal among the embodiment 2;
Figure 15 is that immersed sidewall air cushion vehicle water F body drag reduction is installed the longitudinal section schematic representation among the embodiment 4:
Figure 16 is that a kind of object top that is located at applies side velocity to change the class propeller cavitation modifying device of speed of incoming flow direction vector to incoming flow;
Figure 17 is the schematic diagram of device that a kind of electricity consumption magneto drive mode drives the movable wall motion of rotation capable of circulation.
In the accompanying drawing: 1, rotating cylinder and bearing; 2, support, 3, mantle, substance or multiple movable wall; 4, end seal; 5, a crust of the device or a retaining; 6, flywheel isospin transhipment animal body; 7, the outer movable wall of flywheel isospin transhipment animal body; 8, main movable wall system; 9, dependent activity wall system; 10, rotating shaft and bearing; 11, each runner (driving on the rotating cylinder); 12, each runner (turning on the runner); 13, runner bearing; 14, there is the rubber magnetic stripe of lubricating layer on the surface; 15, by the drag reduction object; 16, turn to rotating cylinder; 17, drive rotating cylinder; 18, the belt wheel of each layer rotating cylinder rotating shaft side; 19, driving belt; 20, sideband; 21, removable wall is worn; 22, installation unit; 23, transport pipe tube wall; 24, channel side installation unit; 25, channel bottom surface installation unit; 26, big rotating cylinder and bearing and rotary shaft rack; 27, air chamber; 28, air cushion hull; 29, straight impeller formula blade; 30, oar axle; 31, the camber of linear electric motor is elementary; 32, alive movable wall.
Now the invention will be further described in conjunction with the accompanying drawings and embodiments:
Embodiment
Embodiment 1
Figure 13 is that petroleum transportation pipeline drag reduction installation unit is divided and each cell position concerns schematic representation, if caliber is about 1100mm, then each cell width is about 500～600mm, be provided with three layers, be followed successively by a weight, two-fold, triple movable wall from inside to outside, movable wall mean specific gravity and oil or lubricated identical with specific gravity can be eliminated the sag that gravity causes, simultaneously be pasted with the flexible compound magnetic stripe again, can prevent or reduce it by touching friction.Establish special joint in the pipeline connection place, arrange in it and drive rotating cylinder, turn to rotating cylinder etc., the movable wall steering mode is with illustrated in Figure 9, the moving wall of every taskwork is installed thickness (containing spacing between thickness own and weight) and is about 4mm, the about 4.4cm of total thickness is provided with knot that can be undone by a pull formula sealing mechanism, to fill lubricated be oil or the water that has mixed the high concentration high molecular polymer with fluid.Reduce approximately 20% though the back area of passage is installed, speed improves 2-4 doubly under equal energy consumption, as combining with the water ring conveying technology, then also can carry under the normal temperature and pressure.
Apparatus of the present invention are installed to reduce the surface friction drag of water to the canal wall in certain level (or the gradient is less) canal for water conveyance, Figure 14 is that installation unit is divided schematic representation, also can increase to draw when cell width is too wide.The top is an air, so do not establish damping device; Along the channel wall five layers of movable wall are installed, every layer outwards is followed successively by one heavy, double, triple, triple, the moving wall of five taskwork from the canal wall, with 100 meters is an installation unit length, at the canal wall recessed groove is set every 100 meters, settle in the groove and drive rotating cylinder, turn to rotating cylinder and each interlayer link mechanism.Be provided with knot that can be undone by a pull formula sealing of the present invention between each installation unit adjacent outermost layer movable wall, establish multistage motive sealing between each unit end baffle and movable wall, charge into the aqueous solution that is mixed with the high concentration high molecular polymer in the space that movable wall surrounds and make oiling agent, drive rotating cylinder and only establish the energy that rotating cylinder smaller power drive motor replenishes fricting resistance loss, or simply do not establish drive motor and make channel that certain slope be arranged, thereby replenish friction loss with the kinetic energy that gravitational energy transforms current are kept at a high speed, each joint, unit can be established conduit and be derived bottom sediment.As desire to make current to promote or acceleration, then above water channel, add an installation unit, this unit only needs one, two layer of movable wall to get final product, (its backhaul side contacts be air), lay lead by certain way in the movable wall and make it to become the secondary of linear electric motor, and arrange in addition by support and be fixed in elementary (as shown in figure 17) on the canal wall, also can outside movable wall, add blade and push away the ability that draining is flowed with increase, but blade should avoid elementary position in order to avoid air gap is excessive, passes to electric current movable wall promotion current were moved upward along the end, slope.Characteristics such as, energy transformation ratio height big because of linear electric motor tool power will be so this channel will have very big purposes long in apart from water diversion project and transportation water channel.
Underwater buoyant body surface use the present invention at certain small waterplane area quad-hull reduces fluid resistance: establishing buoyancy aid is the about 1.5 meters cylinder of diameter, be divided into three installation units, three installation unit positions concern that the section signal is very alike with embodiment one generalized section, different is Hexagon that three unit surround is outside cylinder, each unit is wide about 1 meter, its longitudinal section signal is basic identical with Fig. 4, note the layout of three unit in the initial and tail sections intersection, wherein two at right angles turn at initial and tail sections, stream drag reduction mode arranges that multiple movable wall reduces the resistance when passing through the top in the outside connects again. each unit arranges that five taskwork move wall, the backhaul side is arranged the dependent activity wall, also be five weights, every heavy thick about 5mm spacing 5mm is stained with the homopolarity flexible magnetic strips and prevents or reduce contact friction.Establish the driving rotating cylinder for per about 2 meters, interior centrally-mounted driving, the movable wall sideband is become by high-power driving belt reforming rate, at tip position because of hydrodynamic pressure moving situation more complicated, so set up the driving rotating cylinder again, and thickening outermost surface wall stable with holding device.Each region of interest is provided with sealing mechanism, lubricating fluid adopts the high concentration high molecular polymer aqueous solution, and storage battery etc. can be arranged in the buoyancy aid, after passing to electric current like this, a plurality of drive motor drive movable walls and move backward with the speed greater than the speed of a ship or plane, thus the propelling force of generation and the fluid friction resistance is disappeared.The top adds the propeller device minimizing profile drag after multilayer is improved simultaneously.
Embodiment 4
Offside wall type Hovercraft underwater portion improves, use propelling of the present invention and drag reduction, Figure 15 is the longitudinal section schematic representation, with the cancellation of the hover-skirt of Hovercraft initial and tail sections and with two hollow big rotating cylinders replacements, should twine on the big rotating cylinder and cover movable wall, but because of hull has been lifted away from the water surface, it or not very big carrying out drag-reduction effect again, keep rotating cylinder so save this part device, be equivalent to only arrange the special case of movable wall at initial and tail sections.Though rotating cylinder can provide part buoyancy, the hull load mainly provides buoyancy by air chamber and supports, and reaches sidewall between rotating cylinder and the air chamber and arranges that the movable wall opening all carries out the motive sealing design to reduce the air chamber pressure loss.The rotating cylinder outer wall lays lead, and to make it to become " linear electric motor " secondary, and hull and rotating cylinder intersection are arranged elementary (as shown in figure 17) of " linear electric motor ", energising back rotating cylinder high speed rotating, thus current row is produced thrust to the rotating cylinder rear.Owing to current are arranged to both sides,, wave-making resistance are reduced even elimination so not only reduced profile drag.The rotating cylinder radius is bigger, makes its height that strides across wave, and great waves can only impact rotating cylinder lower half portion, and its impact force becomes the power that rotating cylinder rotates on the contrary, thereby reduces even the elimination rough sea resistance; And two rigid sidewalls also are provided with the moving wall of 5～10 taskwork by outflow drag reduction mode respectively, also can establish driving arrangement propelling force is provided, thereby reduce and even elimination sidewall fluid friction resistance.
Claims (11)
1. damping device that reduces fluid resistance, it is characterized in that: lay the movable wall of one deck to the rotation capable of circulation of multilayer at the flow direction of the body surface longshore current body of need drag reduction, lay one in the space that every layer of movable wall surrounded and heavily arrive the movable wall of multiple rotation capable of circulation, make the moving wall of every layer of every taskwork with the fluid motion campaign, reduce the relative velocity of itself and fluid.
2. damping device according to claim 1 is characterized in that: the movable wall to rotation capable of circulation applies driving force, make it with near so that surpass the speed motion of fluid motion speed.
3. device according to claim 1, it is characterized in that: rotation capable of circulation movable wall surrounded and the space that surrounded with body surface in charge into fluid lubricated and that balance pressure is used, and sealing component is set forms closed space and make its unlikely loss.
4. according to claim 1,2 or 3 described damping devices, it is characterized in that: the movable wall of described rotation capable of circulation is by arranging on the rotating cylinder that is wrapped in a plurality of runners, every pair of runner lays the movable wall of a heavy rotation capable of circulation, thereby in the space that it surrounded, arrange a heavy movable wall that reconstitutes one deck rotation capable of circulation at the most, turn to identical with the moving wall of each taskwork in one deck.
5. damping device according to claim 4, the movable wall that it is characterized in that the rotation capable of circulation of laying at the body surface of need drag reduction, between its first floor movable wall and the body surface, arrange a movable wall device to multilayer rotation capable of circulation, the movable wall switched in opposite of adjacent layer according to same way as.
6. damping device according to claim 4, it is characterized in that of the girth setting of the movable wall of described rotation capable of circulation along object, promptly begin always around to the object tail end from cacumen, return cacumen by the object tail end again and finish a circulation, and arrange again that in its backhaul one side one deck is no less than the movable wall of a rotation capable of circulation that weighs.
7. device according to claim 4, it is characterized in that: distribute by the speed that movable wall is thereon covered in the difference decision or the influence of runner radius on the rotating cylinder, control each layer rotating cylinder rotating speed and turn to by transmission device or calutron between each layer rotating cylinder, the principle that its moving direction and speed are distributed is power and the mutual balance of other resistance that makes the suffered fluid in the moving wall two sides of each taskwork, keeps the required energy consumption minimizing of moving equilibrium state thereby make.
8. damping device according to claim 4, it is characterized in that: the movable wall of described rotation capable of circulation appended around the rotating cylinder that a plurality of runners are arranged in, have at least the mode of taking to connect in the rotating shaft of a rotating cylinder to drive the movable wall cycle rotation, become the driving rotating cylinder with driving mechanism.
9. damping device according to claim 2 is characterized in that: pass to electric current or make it produce induction current by arrange lead on described movable wall, and the non-contact mode that adds electromagnetic field on device drives the movable wall motion of rotation capable of circulation.
10. damping device according to claim 1 is characterized in that: be provided with at the object top incoming flow is applied side velocity to change the mechanism of speed of incoming flow direction vector.
11. device according to claim 3 is characterized in that: described sealing component is a knot that can be undone by a pull formula structure, need and occur alternately drawing back and synthetic again situation with the movable wall operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101067324A CN100489318C (en) | 2005-07-29 | 2006-07-24 | Multi-layer movable wall fluid resistance-reduction and propulsion device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100361797A CN1730950A (en) | 2005-07-29 | 2005-07-29 | Multiple moveable wall surface drag reduction device for fluid |
| CN200510036179.7 | 2005-07-29 | ||
| CNB2006101067324A CN100489318C (en) | 2005-07-29 | 2006-07-24 | Multi-layer movable wall fluid resistance-reduction and propulsion device |
Publications (2)
| Publication Number | Publication Date |
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| CN1892053A true CN1892053A (en) | 2007-01-10 |
| CN100489318C CN100489318C (en) | 2009-05-20 |
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| CNB2006101067324A Expired - Fee Related CN100489318C (en) | 2005-07-29 | 2006-07-24 | Multi-layer movable wall fluid resistance-reduction and propulsion device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527575A (en) * | 2012-07-26 | 2014-01-22 | 上海交通大学 | Novel high-speed surface resistance reduction device |
| CN107218035A (en) * | 2017-06-13 | 2017-09-29 | 北京大学 | A kind of experimental provision of automatic change crack wall mill resistance and method of work and application |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737382A (en) * | 2009-11-13 | 2010-06-16 | 邹立松 | Fluid resistance reducing method and resistance-reduction propulsion unit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2439129A1 (en) * | 1978-10-18 | 1980-05-16 | Iceberg Transport Int | UNDERWATER PROPELLER AT PALES |
| US5619945A (en) * | 1996-01-16 | 1997-04-15 | The United States Of America As Represented By The Secretary Of The Navy | Drag reduction polymer ejection system for underwater vehicle |
| CN1188722A (en) * | 1997-01-24 | 1998-07-29 | 姜大华 | Belt structure anti-drag apparatus |
| CN2317170Y (en) * | 1997-07-16 | 1999-05-05 | 周德群 | Ship capable of relieving water resistance |
| CN1300694A (en) * | 1999-12-18 | 2001-06-27 | 周德群 | Wave-removing ship with sealed air cushion to reduce resistance |
| CN1492155A (en) * | 2002-01-31 | 2004-04-28 | 金荣国 | Method for reducing motion resistance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527575A (en) * | 2012-07-26 | 2014-01-22 | 上海交通大学 | Novel high-speed surface resistance reduction device |
| CN107218035A (en) * | 2017-06-13 | 2017-09-29 | 北京大学 | A kind of experimental provision of automatic change crack wall mill resistance and method of work and application |
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