CN108801585A - A kind of material surface fluid resistance test device based on laser ranging - Google Patents
A kind of material surface fluid resistance test device based on laser ranging Download PDFInfo
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- CN108801585A CN108801585A CN201810364548.2A CN201810364548A CN108801585A CN 108801585 A CN108801585 A CN 108801585A CN 201810364548 A CN201810364548 A CN 201810364548A CN 108801585 A CN108801585 A CN 108801585A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Abstract
The present invention provides a kind of material surface fluid resistance test device based on laser ranging, including environmental simulation unit, motion control unit and test record analytic unit；The environmental simulation unit includes circulating water chennel, turbine, heating tube and temperature controller；The motion control unit includes the linear guide, sliding block, specimen holder, pulley, chain wheel rope and driving object；The linear guide is horizontally placed on above the open trough of straight active section, and both ends are separately fixed at the both ends on the inside of circulating water chennel, and sliding block slip is mounted in the linear guide, and the glide direction of sliding block is parallel with the liquid level below open trough；The test record analytic unit includes laser range finder and computer；Laser range finder is horizontally installed to the linear guide lower section, test liquid ullage.Compared with traditional technology, the present invention possesses towing basin and the corresponding test function of circulating water chennel simultaneously, realizes the accurate test of laboratory sample turbulent surface flow resistance, surface micro-structure drag reduction effect.
Description
Technical field
The invention belongs to fluid detection fields, and in particular to a kind of material surface fluid resistance test based on laser ranging
Device.
Background technology
When object moves in the viscous fluids such as water, there can be momentum transmission between the fluid of relative motion, that is, flow
Know from experience the reaction force for being generated to object and hindering its movement, which is also referred to as fluid resistance.Fluid resistance, which is generally divided into, rubs
Resistance and pressure drag are wiped, frictional resistance is the flow resistance that body surface shearing force generates, the opposite fortune in direction and fluid
Dynamic direction on the contrary, and pressure drag is then perpendicular to the resistance to object of which movement that the pressure of body surface generates, transported with object
For fluid bypasses object when dynamic, the shape of both resistances and object, the roughness of the characteristic length of object and body surface
It is related.How effectively to reduce the fluid resistance in ship running and pipeline transportation at present becomes raising ship running performance, pipeline
Transport capacity and save fuel key, and how to the object of which movement of different shape, size and surface roughness during
Fluid resistance carries out simple and rapid test as the important ring in this research field.
It is using electricity that device currently used for fluid test, which mainly has towing basin, water hole and circulating water chennel, towing basin,
Dynamic trailer traction ship model and carry out, using trailer constant speed towed model at various speeds in test process, according at the uniform velocity transporting
The principle of outer dynamic balance, pulling force is pulled to obtain the overall drag under ship model friction speed by test suffered by dynamic lower object, then
The real ship resistance being converted into using Froude's law under suitable speed；Water hole is a flow velocity and the water that pressure can control respectively
The circulatory system, exactly the opposite with towing basin, the not instead of test object moved in water hole, controllable flow passes through manufacture
High-velocity flow tests the ship running resistance under different turbulence states；Similar with water hole, circulating water chennel is solid using model
Fixed motionless, uniform fluid flow tests the suffered power of the simple geometries body such as submarine navigation device when flowing.Apparatus above from
Two aspects of both macro and micro test the fluid resistance during hull and simple geometry model sport, but still exist
Deficiency is not appropriate for the simple and quick test of single curved surface if towing basin is higher to the area and cost requirement of experimental site,
And it is the principle of relative motion to simulate state when object of which movement that water hole and circulating water chennel, which utilize, with object real motion shape
State is compared to there are certain errors, while current test is at the uniform velocity to test fluid resistance under state, is needed to difference
The resistance of object is fitted under speed, and test process is cumbersome, and is then that boat-carrying engine applies drive when hull real motion
Hull is changed into accelerated motion by static after power, and hull reaches uniform speed motion state when resistance is equal with power is applied, because
This lacks the simple test device for the hull wall surface resistance variation that simulation has under boat-carrying engine driving operating mode at present.
Invention content
The present invention is directed to the deficiency for having measuring technology, provides a kind of material surface fluid resistance based on laser ranging
Test device can measure different shape sample in fluid state not of the same race, different postures, different driving work by the test device
Fluid resistance under condition.
The present invention is achieved through the following technical solutions：
A kind of material surface fluid resistance test device based on laser ranging, including environmental simulation unit, motion control
Unit and test record analytic unit；
The environmental simulation unit includes circulating water chennel, turbine, heating tube and temperature controller；
The circulating water chennel is a circulating line, including straight active section and changeover portion two parts, and the straight active section is length
Degree is not less than 0.5 meter and surface corresponds to the straight tube for being provided with open trough；The modes of emplacement of circulating water chennel requires so that straight active section is in
Horizontality and the highest that its height above sea level is entire circulating water chennel；Test liquid, the straight work are marked with inside the circulating water chennel
The open trough and liquid level of section upper surface are vertical with gravity direction, and test liquid is not spilt over during the test；
The turbine is mounted on the changeover portion part in circulating water chennel, waterproof machine built in turbine and rotating speed control
Device makes the test liquid inside circulating water chennel be formed and follows for accurately being adjusted to the rotating speed of motor by rotational speed governor
Ring turbulent flow；
The heating tube is fixedly mounted on the changeover portion part in circulating water chennel, the temperature by the supporting rack level at both ends
Control device is arranged in the outside of circulating water chennel, is electrically connected with heating tube by conducting wire, and heating tube is combined with temperature controller constitutes closed loop temperature
Control system；
The motion control unit includes the linear guide, sliding block, specimen holder, pulley, chain wheel rope and driving object；
The linear guide is horizontally placed on above the open trough of straight active section, and both ends are separately fixed in circulating water chennel
The both ends of side, sliding block slip is mounted in the linear guide, and the glide direction of sliding block is parallel with the liquid level below open trough；
The specimen holder is in tabular, is used for clamping laboratory sample；The overall dimensions of the specimen holder are less than experiment
Sample, so that specimen holder can be completely covered in laboratory sample；The specimen holder rotates certainly by one at least provided with two
It is connect with sliding block by the attitude-adjusting system spent；
The pulley is fixedly mounted on outside support, and chain wheel rope bypasses pulley, and one end and the setting of chain wheel rope are recycling
Outside sink driving object connection, and make chain wheel rope be tightened up after this section direction be along gravity direction vertical side
To；The other end of chain wheel rope pass through circulating water chennel side wall on through-hole connect with sliding block, and so that chain wheel rope be tightened up after the section
Direction be horizontal direction；
The driving object is the weight block of a force sensor, and the force snesor is current for measuring feedback in real time
Drive pulling force size of the object to chain wheel rope；The driving object has setting driving energy consumption mode, setting traction drive power side
Formula and setting hauling speed three kinds of working methods of curve mode；
The test record analytic unit includes laser range finder and computer；The laser range finder is horizontally installed to directly
Line guide rail lower section, test liquid ullage；The shoot laser beam of the laser range finder in the horizontal direction, shoot laser beam quilt
The surface reflection of sliding block returns the photoelectric sensor of laser range finder；The computer and laser range finder and driving object are homogeneous
Even, for receiving the displacement of laboratory sample and pulling force during fluid resistance measurement.
The present invention has the advantages that：
1, how effectively to reduce at present fluid resistance in ship running and pipeline transportation become improve ship running performance,
Pipeline transportation ability and the key for saving fuel, and how to the object of which movement process of different shape, size and surface roughness
In fluid resistance carry out simple and rapid test and become an important ring in this research field.Compared with traditional technology, this
It invents while possessing towing basin and the corresponding test function of circulating water chennel, realize laboratory sample turbulent surface flow resistance, surface
The accurate test of micro-structure drag reduction effect, the sample that can test different surfaces micro-structure meet stream in different fluid environment, difference
Under posture operating mode, fluid drag-reduction effect when in different set driving energy consumption, setting traction drive power, setting hauling speed curve
It answers, it both can be by comparing multiple total time-consuming average values for having the sample of different surfaces micro-structure under identical operating mode, total energy consumption
Average value, Velocity-time variation average value curve, tractive force-time change average value curve, obtain different surfaces micro-structure pair
The effect of fluid drag-reduction, can also be by comparing total consumption of the same sample with particular surface micro-structure under different operating modes
When average value, the average value that always consumes energy, Velocity-time variation average value curve, tractive force-time change average value curve, obtain
The surface micro-structure is under different operating modes to the effect of fluid drag-reduction.
2, the ingenious guide rail slide block that pulley is utilized and connects vertically-mounted driving weight block and is horizontally mounted of the present invention, makes
Driving force come from driving object from gravitational effect, sample is high by the energy consumption estimation precision in distraction procedure, adjust ten
It is convenient to divide, and simple system is reliable, at low cost；The present invention has been also compatible with the traction drive set by preprogramming using servo motor
Power and hauling speed change curve traction drive object of which movement, so that the sample of test different surfaces micro-structure is not
With fluid drag-reduction effect when setting traction drive power and hauling speed change curve；Three of the above draws the direct mould of operating mode
The real working condition of marine ship, submarine navigation device under constant thrust, the setting speed of a ship or plane and the setting variation speed of a ship or plane is intended, has had fabulous
Adaptability.
3, present invention employs the specimen holders with attitude-adjusting system so that sample can meet stream appearance in space always
State, to according to the needs of different contrast experiments, near wall fluid of the different angles incomings such as simulation crossing current, longitudinal stream to sample
The influence of resistance.
4, present invention employs circulatory flow design, different fluid velocities is can get by turbine, and by temperature controller
Fluid temperature (F.T.) is controlled with heating tube co-ordination, the fluid state with setting Reynolds number can be constructed, provided abundant
Measurement condition condition；Moreover, realization of this function in structure is very simple, reliable, manufacturing cost is low, and dismounting, repair are very
Simply.
5, present invention employs laser range finders and driving object end force snesor as contactless, noninvasive data
Obtaining means, compared in traditional approach such as specimen surface patch sensors, data acquisition is objective, true and reliable, and Laser Measuring
The high-frequency precision ranging feature of distance meter so that the Real-time Feedback of analysis sample during the motion is possibly realized, you can in terms of
Calculation obtains total time-consuming and Velocity-time change curve of the sample in movement travel；The examination fed back by analyzing force snesor
Sample suffered real-time tractive force numerical value in movement travel obtains tractive force-time changing curve；These abundant test datas are all
It is the information that conventional method can not obtain.
6, present invention accomplishes the test of emerging surface micro-structure drag reduction technology needs, have high position accuracy, high-transmission
Ability and high anti-jamming capacity, physical principle is simply clear, and applicability is good, easy to operate.
7, the present invention can simulate various liquid environments, single to salinity, temperature, turbidity etc. or confounding factor influence
It is studied；Can to the persistence of microstructural surfaces such as super hydrophobic surface that distinct methods are made in liquid environment,
Anti-corrosive properties, surface-clinging ability are studied, and are effective monitoring devices of the fluid drag-reduction effect test of surface micro-structure.
Description of the drawings
Fig. 1 is the structure chart of the material surface fluid resistance test device of the present invention based on laser ranging.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments；The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations；The present invention is done with reference to the accompanying drawings and detailed description
Further details of explanation.
As shown in Figure 1, the present invention provides a kind of material surface fluid resistance test device based on laser ranging, including
Environmental simulation unit, motion control unit and test record analytic unit.
The environmental simulation unit includes circulating water chennel 10, turbine 5, heating tube 17 and temperature controller 16.
The circulating water chennel 10 is a circulating line, and straight active section and changeover portion two parts can be classified as by function,
In straight active section be length not less than 0.5 meter and surface corresponds to the straight tube for being provided with open trough；The modes of emplacement of circulating water chennel 10 can
To be to keep flat or place vertically, it is desirable that so that the highest that straight active section is horizontal and its height above sea level is entire circulating water chennel 10,
Even if be marked with test liquid 6 (water, seawater or organic solution etc.) inside proper circulating water chennel 10, straight active section upper surface opens
Mouth slot and liquid level are vertical with gravity direction, and test liquid is not spilt over during the test.
The turbine 5 is mounted on the changeover portion part in circulating water chennel 10, waterproof machine built in turbine 5 and rotating speed control
Device processed accurately adjusts the rotating speed of motor by rotational speed governor, the test liquid inside circulating water chennel 10 can be made to be formed
Turbulent flow is recycled, the fluid resistance of material surface under different turbulence states is tested to realize.
The heating tube 17 is fixedly mounted on the changeover portion part in circulating water chennel 10, institute by the supporting rack level at both ends
It states temperature controller 16 to be arranged in the outside of circulating water chennel 10, is electrically connected with heating tube 17 by conducting wire, is arranged so that heating tube
17 combine composition closed-loop temperature control system, the temperature for test liquid in control loop sink 10 with temperature controller 16.
The motion control unit includes the linear guide 3, sliding block 8, specimen holder 12, pulley 1, chain wheel rope 2 and driving object
Body 4.
The linear guide 3 is horizontally placed on above the open trough of straight active section, and both ends are separately fixed at circulating water chennel
The both ends of 10 insides, 8 slip of sliding block is mounted in the linear guide 3, and the glide direction of sliding block 8 and the liquid below open trough
Face is parallel.
The specimen holder 12 is in tabular, is used for clamping laboratory sample 14；It is required that the overall dimensions of specimen holder 12 are small
In laboratory sample 14, so that specimen holder 12 can be completely covered in laboratory sample 14.The specimen holder 12 by one at least
There are two the attitude-adjusting systems 11 of rotary freedom to be connect with sliding block 8 for band.One Pivot axle of attitude-adjusting system 11
(might as well be known as Z axis), vertically another Pivot axle (might as well be known as X-axis) can also be preferably arranged along level
Third Pivot axle (Y-axis might as well be known as) and vertical with X-axis, z-axis, be arranged so that can by Z axis, X-axis (and
Y-axis) coordinate the spatial attitude for adjusting laboratory sample 14, to which according to the needs of different contrast experiments, crossing current, longitudinal direction can be simulated
The different angles incomings such as stream influence the near wall fluid resistance of laboratory sample 14.The laboratory sample 14 can be plane or appoint
Meaning curved surface, surface, which makes, micro-structure (groove, ridged, microtrabeculae or micropore for graphically arranging etc.) or coated film.
The pulley 1 is fixedly mounted on outside support 9, and chain wheel rope 2 bypasses pulley 1, and one end and the setting of chain wheel rope 2 exist
Driving object 4 outside circulating water chennel 10 connects, and the direction of this section is along gravity direction after chain wheel rope 2 is tightened up
Vertical direction；The other end of chain wheel rope 2 passes through the through-hole on 10 side wall of circulating water chennel to be connect with sliding block 8, and makes 2 quilt of chain wheel rope
The direction of this section is horizontal direction (i.e. parallel with following liquid level, vertical with gravity direction) after tension.
The driving object 4 is the weight block of a force sensor, and force snesor can measure feedback and work as forerunner in real time
Real-time pulling force data can be transferred to computer 15 by animal body 4 to the pulling force size of chain wheel rope 2, force snesor；Drive object 4
Setting driving energy consumption, setting traction drive power, setting hauling speed three kinds of working methods of curve can be provided, wherein setting driving
Energy consumption mode refers to adjusting the size of its gravitional force by changing the quality of weight block, it is desirable that weight block can be with movable slider
8 (being fixed with the specimen holder 12 for being mounted with laboratory sample 14 thereon) are from one end parallel motion of the linear guide 3 to the other end；If
Determine traction drive power and set hauling speed curve mode then to be driven by the external closed-loop control servo motor with dynamic tension instrument
Dynamic system pull the traction drive power that weight block sets along gravity direction with any preprogramming or hauling speed change curve to
Lower movement, to movable slider 8 specimen holder 12 of laboratory sample 14 (be fixed be mounted with thereon) from one end of the linear guide 3
Parallel motion is to the other end.
The test record analytic unit includes laser range finder 7 and computer 15.
The laser range finder 7 is horizontally installed to 3 lower section of the linear guide, test liquid ullage；The laser ranging
In the horizontal direction (i.e. parallel with following liquid level, vertical with gravity direction), shoot laser beam is by sliding block for the shoot laser beam of instrument 7
8 surface reflection returns the photoelectric sensor of laser range finder 7, to obtain sliding block 8 in real time (thereon by laser range finder 7
Be fixed with the specimen holder 12 for being mounted with laboratory sample 14) position, and then obtain laboratory sample 14 position.
The computer 15 and laser range finder 7 and driving object 4 are connected, for during receiving fluid resistance measurement
The displacement S and pulling force Ft of laboratory sample 14, in conjunction with driving object 4, sliding block 8, specimen holder 12 and laboratory sample 14 quality, with
And the spatial position change at any time of laboratory sample 14 of acquisition, calculate the laboratory sample 14 of day part fixed journey system (i.e.
Rail length) speed v, acceleration a, total time-consuming, speed change curves and fluid resistance F in movement travel.
The present invention also provides a kind of test sides of the material surface fluid resistance test device based on above-mentioned laser ranging
Method specifically comprises the following steps：
(1) prepare multiple laboratory samples 14；The laboratory sample 14 is plane or curve form sample, and surface, which makes, to be had
Micro-structure (groove, ridged, microtrabeculae or micropore for graphically arranging etc.) or coated film.The shape of the laboratory sample 14, ruler
At least one in very little and surface roughness data is differed with other laboratory samples 14.It is provided with and can be consolidated on laboratory sample 14
Determine the retaining part of clamping；For example, 14 back side of laboratory sample drills out blind hole and tapping, it is fixed for passing through screw 13.
(2) clamping laboratory sample 14；Appoint and take a laboratory sample 14, is fixed in the material surface based on laser ranging
On specimen holder 12 in fluid resistance test device, and according to operating mode needs, pass through the pose adjustment machine on sliding block 8
Structure 11 carrys out the spatial attitude of adjusting sample fixture 12 and laboratory sample 14, with different angles incomings such as simulation crossing current, longitudinal streams
The near wall fluid resistance of laboratory sample 14 is influenced；
(3) test primary condition setting, including：
(3.1) laser range finder 7 is arranged in setting test record analytic unit, and the shoot laser beam after making it adjust is along water
Square to, and can by the surface reflection of sliding block 8 return laser range finder 7 photoelectric sensor, so as to obtain sliding block 8 in real time
The position of (being fixed with the specimen holder 12 for being mounted with laboratory sample 14 thereon), and then obtain the position of laboratory sample 14.
(3.2) sample drive condition, the i.e. working method of setting driving object 4 are set so that it can by setting driving energy
The operation of one of consumption, setting traction drive power, setting hauling speed three kinds of working methods of curve；
It is taken when using setting driving energy, the driving force of laboratory sample 14 starts and drives from its own gravity of driving object 4
4 initial stage of animal body, driving force are much larger than fluid resistance, and driving object 4, specimen holder 12, laboratory sample 14 and sliding block 8 add
Speed movement, the pulling force in abseiling 2 is much larger than fluid resistance at this time, while pulling force is also much smaller than driving force, with laboratory sample 14
Speed be continuously increased, the pulling force in fluid resistance and chain wheel rope constantly increases, and the acceleration of whole system constantly reduces,
If acceleration distance (i.e. the active length of the linear guide 3) is enough, the speed of laboratory sample 14 can reach maximum value and (make later even
Speed movement), final sliding block 8 and laboratory sample 14 (are surveyed by one end (test starting point) parallel motion of the linear guide 3 to the other end
Try terminal), if acceleration distance (i.e. the active length of the linear guide 3) is insufficient to, state of the laboratory sample 14 to accelerate always
By the linear guide 3 the parallel motion of test starting point to test terminal；
When using setting traction drive power or setting hauling speed curve mode, need to carry dynamic tension using external
The closed-loop control servo motor driving system of instrument pulls driving object 4 to be driven with the traction that any preprogramming is set along gravity direction
Power or hauling speed change curve move downward, to (be fixed be mounted with the sample of laboratory sample 14 thereon with movable slider 8
Fixture 12) from one end parallel motion of the linear guide 3 to the other end.
(3.3) test environment is arranged；Operating mode to be simulated is needed according to experiment, makes to fill test liquid in circulating water chennel 10
(fresh water, seawater, suspension, organic solvent etc.) makes turbine 5 be run according to the rotating speed of setting to provide different fluid speed
Degree, and fluid temperature (F.T.) is controlled by temperature controller 16 and 17 co-ordination of heating tube, construct the fluid state with setting Reynolds number；
The sequencing of (3.1) to (3.3) step can be adjusted arbitrarily above；
(4) position of adjusting slider 8 so that sliding block 8 is located at the first end of the linear guide 3, and the first end refers to and drives
Animal body 6 is apart from farthest one end；
(5) start laser range finder 7 and start ranging, that is, record the test initial position of sliding block 8；
(6) start driving object 4 so that it can by setting driving energy consumption mode, setting traction drive power mode or setting
One of these three working methods of hauling speed curve mode work, and (are fixed with are mounted with laboratory sample 14 thereon with movable slider 8
Specimen holder 12) from one end parallel motion of the linear guide 3 to the other end；4 band force snesor institute of institute of whole process record driving object
The real-time tractive force numerical value of feedback；
(7) the test end position for recording sliding block 8, stops the ranging of laser range finder 7 later；
(8) test data processing and analysis, including it is as follows：
(8.1) position data changed over time according to the laboratory sample 14 of 7 Real-time Feedback of laser range finder, accurately calculates
Go out the speed of arbitrary test position of the laboratory sample 14 in fixed journey system (testing starting point to the distance for testing terminal), accelerate
Degree, kinetic energy numerical value, that is, total time-consuming, Velocity-time change curve, acceleration-time changing curve, kinetic energy-time change are bent
Line；
(8.2) the pulling force numerical value that object 4 provides currently is driven according to the force snesor Real-time Feedback of driving object 4,
Obtain the traction drive power numerical value that laboratory sample 14 changes over time, that is, tractive force-time changing curve；
(9) step (4)~(8) n times are repeated, the repetition n times test result of same laboratory sample 14 is obtained, to calculate
Total time-consuming average value, Velocity-time of the laboratory sample 14 in fixed journey system (i.e. rail length) motion process change average value
Curve, acceleration-time change average value curve, kinetic energy-time change average value curve, tractive force-time change average value
Curve；N be it is preset be more than 1 arbitrary integer；
(10) to the every other laboratory sample 14 that do not test, step (2)~(9) are repeated, until completing all realities
Test the test of sample 14；
(11) multi-group data obtained by analytical procedure (1)~(10), obtains same laboratory sample 14 and difference is real
Sample 14 is tested in the case where different fluid environment, difference meet stream posture operating mode, in different set constant driving, driving power consumption or is set
Determine fluid drag-reduction effect when speed change curves.
It specifically includes：
(11.1) it is directed to setting driving energy and consumes working method, since the driving energy of laboratory sample 14 is by driving object 4
Its own gravity potential energy (according to driving object 4 quality and move distance can accurately calculate) provide, by compare step (8),
(9) obtain laboratory sample 14 change over time kinetic energy, speed, acceleration, traction drive power, the same experiment can be obtained
Sample 14 or different experiments sample 14 multiple fluid environment, it is a variety of meet stream posture operating mode under, (ignore under identical driving energy consumption
Windage difference of the various parts in multiple test process) overcome speed, kinetic energy that surfactant fluid resistance obtained, it obtains identical
The required driving energy consumption of speed, kinetic energy, and obtain this fortune by investigating the traction drive power dynamic fluctuation of laboratory sample
The dynamic fluctuation situation of surfactant fluid resistance during dynamic；
(11.2) be directed to setting traction drive power or setting hauling speed curve working method, by compare step (8),
(9) obtain laboratory sample 14 change over time kinetic energy, speed, acceleration, traction drive power, the same experiment can be obtained
Sample or different experiments sample multiple fluid environment, it is a variety of meet stream posture operating mode under, obtained in arbitrarily setting traction drive power
Speed, kinetic energy, under arbitrarily setting hauling speed needed for traction drive power, to the relatively same laboratory sample or
Different experiments sample is in multiple fluid environment, a variety of surfactant fluid drag sizes met under stream posture operating mode.
Preferably, the solution composition of test liquid, temperature, turbulent velocity and laboratory sample 14 can also be changed respectively
Surface topography, shape, size, ingredient and angle of inclination obtain fluid resistance numerical value and the curve under corresponding conditions, to right
Corresponding drag reduction technology and principle are studied.
The present invention can be changed as various ways, this is apparent to one skilled in the art, and such change is not
Think to depart from the scope of the present invention.The technical staff in the field is obviously changed as all, is included within this
Within the scope of the claims.
Claims (2)
1. a kind of material surface fluid resistance test device based on laser ranging, which is characterized in that including environmental simulation unit,
Motion control unit and test record analytic unit；
The environmental simulation unit includes circulating water chennel (10), turbine (5), heating tube (17) and temperature controller (16)；
The circulating water chennel (10) is a circulating line, including straight active section and changeover portion two parts, and the straight active section is length
Degree is not less than 0.5 meter and surface corresponds to the straight tube for being provided with open trough；The modes of emplacement of circulating water chennel (10) requires so that straight work
The highest that section is horizontal and its height above sea level is entire circulating water chennel (10)；It is marked with test liquid inside the circulating water chennel (10)
(6), the open trough and liquid level of the straight active section upper surface are vertical with gravity direction, and test liquid is during the test not
It overflows；
The turbine (5) is mounted on the changeover portion part in circulating water chennel (10), waterproof machine and rotating speed built in turbine (5)
Controller, for accurately being adjusted to the rotating speed of motor by rotational speed governor, the test fluid for keeping circulating water chennel (10) internal
Body forms cycle turbulent flow；
The heating tube (17) is fixedly mounted on the changeover portion part in circulating water chennel (10), institute by the supporting rack level at both ends
State temperature controller (16) be arranged in the outside of circulating water chennel (10), be electrically connected with heating tube (17) by conducting wire, heating tube (17) and
Temperature controller (16) joint constitutes closed-loop temperature control system；
The motion control unit include the linear guide (3), sliding block (8), specimen holder (12), pulley (1), chain wheel rope (2) and
Drive object (4)；
The linear guide (3) is horizontally placed on above the open trough of straight active section, and both ends are separately fixed at circulating water chennel
(10) both ends on the inside of, sliding block (8) slip is mounted in the linear guide (3), and the glide direction and open trough of sliding block (8)
The liquid level of lower section is parallel；
The specimen holder (12) is in tabular, is used for clamping laboratory sample (14)；The overall dimensions of the specimen holder (12)
Less than laboratory sample (14), so that specimen holder (12) can be completely covered in laboratory sample (14)；The specimen holder (12)
It is connect with sliding block (8) at least provided with the attitude-adjusting systems (11) of two rotary freedoms by one；
The pulley (1) is fixedly mounted on outside support (9), chain wheel rope (2) bypass pulley (1), one end of chain wheel rope (2) with
Driving object (4) connection external in circulating water chennel (10) is set, and the direction of this section is edge after chain wheel rope (2) is tightened up
The vertical direction of gravity direction；The other end of chain wheel rope (2) passes through the through-hole on circulating water chennel (10) side wall to connect with sliding block (8)
Connect, and make chain wheel rope (2) be tightened up after this section direction be horizontal direction；
The driving object (4) is the weight block of a force sensor, and the force snesor is current for measuring feedback in real time
Drive pulling force size of the object (4) to chain wheel rope (2)；The driving object (4) has setting driving energy consumption mode, setting traction
Driving force mode and setting hauling speed three kinds of working methods of curve mode；
The test record analytic unit includes laser range finder (7) and computer (15)；The horizontal peace of the laser range finder (7)
Loaded on the linear guide (3) lower section, test liquid ullage；The shoot laser beam of the laser range finder (7) in the horizontal direction,
Shoot laser beam is returned the photoelectric sensor of laser range finder (7) by the surface reflection of sliding block (8)；The computer (15) and laser
Rangefinder (7) is connected with driving object (4), displacement and drawing for receiving laboratory sample (14) during fluid resistance measurement
Power.
2. the material surface fluid resistance test device according to claim 1 based on laser ranging, which is characterized in that institute
It refers to adjusting the size of its gravitional force by changing the quality of weight block to state setting driving energy consumption mode；The setting traction
Driving force and setting hauling speed curve mode refer to driving system by the external closed-loop control servo motor with dynamic tension instrument
The traction drive power or hauling speed change curve that system pulling weight block is set along gravity direction with any preprogramming are transported downwards
It is dynamic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810364548.2A CN108801585B (en) | 2018-04-20 | 2018-04-20 | Material surface fluid resistance testing device based on laser ranging |
Applications Claiming Priority (1)
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