CN110849581A - Deformation wall resistance testing device based on fish body surface structure - Google Patents
Deformation wall resistance testing device based on fish body surface structure Download PDFInfo
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Abstract
The application discloses deformation wall resistance testing arrangement based on fish body surface structure, including undulant wall vibration telescopic machanism, hydrologic cycle mechanism and differential pressure resistance test mechanism, hydrologic cycle mechanism includes water pump and circulation line, the delivery port of water pump by circulation line is connected with the water inlet of water pump, forms rivers circulation circuit. The flexible mechanism of undulant wall vibration includes motor drive, flexible wall of flexible and a plurality of flexible bracing pieces of even interval fixed locating flexible wall bottom, and all flexible bracing pieces all are located the coplanar, and every flexible bracing piece upper end all connects flexible wall bottom of flexible to be fixed, and flexible wall of flexible is located in the circulation line. The device of this application simple structure, the power of water circulation mechanism main through the pump provides the rivers field condition for the device, and circulating line's design not only can effectively reduce the energy consumption, provide the experiment rivers field of sufficient velocity of flow, can also reduce the occupation space of device.
Description
Technical Field
The application relates to a deformation wall resistance testing device based on a fish body surface structure.
Background
The continuous development of the current technological level, the performance of ships and underwater vehicles is improved day by day, and the number of the ships and underwater vehicles is increased day by day, so that the effective reduction of the surface friction resistance of the ships, the underwater vehicles and the like becomes a breakthrough for people to create new energy-saving technologies. Ray and the like can realize quick swimming under water with extremely low resistance by utilizing body functions, and the body is not attached by other marine organisms and microorganisms, so that the swimming mode with low energy and high efficiency is hopefully possessed by any underwater navigation body. The development of bionic and wall drag reduction technologies requires us to understand and master physiological structures and internal motion mechanisms of fish, and realize low-resistance swimming to control the high efficiency of external flow. However, due to the characteristics of overlong period, high expenditure requirement and the like of methods such as numerical simulation, fluid experiment and the like, many researches only stay at a theoretical level, and the existing hydrodynamic drag reduction technology is not developed in the engineering field.
Therefore, the development and design of the device for testing the resistance of the fluctuating wall surface by designing the small-sized flow resistance testing device for the laboratory so as to meet the requirements of miniaturization and capability of being coupled with different surfaces to carry out various composite resistance testing experiments are very important for the development of the resistance reduction technology. On the basis of a laboratory, the resistance measuring device provides reliable and accurate process parameters for the application of the resistance reducing technology, even the resistance reducing material, and is an important step for promoting the more deep development of the resistance reducing technology.
Disclosure of Invention
To the above-mentioned technical problem that prior art exists, the utility model aims at providing a deformation wall resistance testing arrangement based on fish body surface structure.
The deformation wall surface resistance testing device based on the fish body surface structure is characterized by comprising a fluctuation wall surface vibration telescopic mechanism, a water circulation mechanism and a differential pressure resistance testing mechanism, wherein the water circulation mechanism comprises a water pump and a circulation pipeline, and a water outlet of the water pump is connected with a water inlet of the water pump through the circulation pipeline to form a water flow circulation loop; the circulating pipeline is also provided with a water injection plug, a water outlet plug and an air discharge plug, the circulating pipeline comprises a horizontally placed test section straight pipe, and the differential pressure resistance testing mechanism can respectively detect the static pressure of water flow at the inlet and the outlet of the test section straight pipe; the fluctuating wall surface vibration and stretching mechanism comprises a motor transmission device, a deformable flexible wall surface and a plurality of stretching support rods which are uniformly and fixedly arranged at the bottom of the deformable flexible wall surface at intervals and can stretch and deform in the length direction, all the stretching support rods are positioned on the same plane, the upper end of each stretching support rod vertically extends into the test section straight pipe through a magnetic fluid sealing piece correspondingly arranged at the bottom of the test section straight pipe, and the bottom of the deformable flexible wall surface is connected and fixed, so that the deformable flexible wall surface is horizontally arranged in the middle of the inside of the test section straight pipe; the motor transmission device supports the lower ends of the telescopic supporting rods in a propping manner, the telescopic supporting rods can do up-and-down reciprocating motion in a vertical plane under the driving action of the motor transmission device, the moving directions of the two adjacent telescopic supporting rods are opposite, and the deformable flexible wall surface is driven to be bent and deformed into a sine-wave-shaped fluctuation wall surface.
The device for testing the resistance of the deformed wall surface based on the fish body surface structure is characterized in that the motor transmission device comprises a stepping motor, a quincunx coupler and a cam shaft, an output shaft of the stepping motor is fixedly connected with one end part of the cam shaft through the quincunx coupler, a plurality of eccentric disc cams with different initial phases are uniformly arranged on the cam shaft at intervals, and the phase difference between every two adjacent eccentric disc cams is 90 degrees so as to output a sine waveform; the number of the eccentric disc cams is the same as that of the telescopic supporting rods, and the eccentric disc cams are correspondingly arranged below the telescopic supporting rods and used for tightly supporting the telescopic supporting rods.
The device for testing the resistance of the deformed wall surface based on the fish body surface structure is characterized in that the motor transmission device further comprises two bearing blocks which are arranged at two ends of the camshaft and used for supporting the camshaft, a bearing is arranged at the upper end of each bearing block, and the camshaft is installed on the bearing blocks in a matched mode through the bearings; all eccentric disc cams on the camshaft all set up in between two bearing blocks, the quantity of eccentric disc cams on the camshaft is 5, when being close to step motor's one end along the camshaft and extending towards the horizontal direction of the one end that step motor was kept away from to the camshaft, 5 eccentric disc cam's initial phase is 0 °, 90 °, 180 °, 270 and 360 respectively.
The device for testing the resistance of the deformed wall surface based on the fish body surface structure is characterized in that the telescopic supporting rod comprises a roller, a roller bracket, a first spring foot pad, a spring, a second spring foot pad, a threaded pipe and a threaded rod which are sequentially arranged from bottom to top, wherein a female thread is arranged in the threaded pipe, a matched male thread is arranged at the lower end of the threaded rod, and the lower end of the threaded rod is in matched threaded connection with the threaded pipe; the upper end of the threaded rod vertically extends into the test section straight pipe through a magnetic fluid sealing element at the bottom of the test section straight pipe and is fixedly connected with the bottom of the deformable flexible wall surface.
The device for testing the resistance of the deformed wall surface based on the fish body surface structure is characterized in that a horizontal threaded hole is formed in the center of the roller, a bolt is in threaded connection with the threaded hole of the roller in a matched mode, and the roller is fixedly installed on the roller support; the thickness of the roller is the same as that of the eccentric disc cam, and the thickness surface of the roller is tightly attached to the thickness surface of the corresponding eccentric disc cam.
A warp wall resistance testing arrangement based on fish body surface structure, its characterized in that the material of flexible wall of flexible is for pressing from both sides stainless steel meshwork offset plate, and flexible wall of flexible includes two the same flexible extension boards, the tip of two flexible extension boards aligns the laminating and glues the upper surface at first support grillage through gluing agent in the lump, all is equipped with a plurality of second support grillages on every flexible extension board, and second support plate frame top surface is equipped with the slot that matches with flexible extension board width, flexible extension board cooperation is inserted and is located in the slot, still be equipped with on the slot of second support grillage and be used for carrying out spacing gag lever post to flexible extension board, the gag lever post parallels with the width direction of flexible extension board.
The device for testing the resistance of the deformable wall surface based on the fish body surface structure is characterized in that the sum of the number of first supporting plate frames and the number of second supporting plate frames on the deformable flexible wall surface is the same as the number of telescopic supporting rods, waterproof deep groove ball bearings are arranged at the bottoms of the first supporting plate frames and the second supporting plate frames, and the waterproof deep groove ball bearings at the bottoms of the first supporting plate frames and the waterproof deep groove ball bearings at the bottoms of the second supporting plate frames are respectively and fixedly connected with the upper ends of the different telescopic supporting rods in a sealing manner; the one end that first supporting plate frame was kept away from to two flexible extension boards all unsettled setting.
A warp wall resistance testing arrangement based on fish body surface structure, its characterized in that the test section straight tube is formed by two sealed concatenations of semicircle pipe, pressure differential resistance accredited testing organization is close to two pressure structures of getting of both ends opening part including locating test section straight tube top, every pressure structure of getting all is connected with pressure velocity of flow sensor.
The deformation wall surface resistance testing device based on the fish body surface structure is characterized in that the circulating pipeline comprises a reducing corner pipe, a first stable section pipe, a contraction pipe, a test section straight pipe, a divergence pipe, a second stable section pipe, an equal-diameter corner bent pipe and a backwater reducing pipe section, and a water outlet of the water pump is connected with a water inlet of the water pump sequentially through the reducing corner pipe, the first stable section pipe, the contraction pipe, the test section straight pipe, the divergence pipe, the second stable section pipe, the equal-diameter corner bent pipe and the backwater reducing pipe section to form a water flow circulating loop; the contraction pipe and the divergence pipe are in mirror symmetry, the water injection plug is arranged at the top of the first stable section pipe, the air discharge plug is arranged at the top of the second stable section pipe, and the water outlet plug is arranged at the bottom of the equal-diameter corner bent pipe.
The deformation wall surface resistance testing device based on the fish body surface structure is characterized by further comprising a support frame, wherein the backwater reducing pipe section is arranged inside the support frame, and two ends of the backwater reducing pipe section penetrate out of the support frame and are respectively connected with the equal-diameter corner elbow and a water inlet of the water pump; the test stand is characterized in that a U-shaped frame is arranged on the upper surface of the support frame, the motor transmission device is fixedly arranged on the upper surface of the U-shaped frame, and a pair of support frames is fixedly arranged between the upper surface of the U-shaped frame and the bottom of the test section straight pipe.
Compared with the prior art, the beneficial effect that this application was got is:
1) the application is a deformation wall resistance testing arrangement based on fish body surface structure, and it can realize the simulation to marine environment in the laboratory, and the drag reduction rate of all kinds of non-smooth surfaces of the diversification that the quantitative test leads to under the parameter of different fluctuation range and cycle provides reliable and accurate technological parameter for the drag reduction experiment. The device has greatly solved the restriction in place and cost, has improved experiment speed and development efficiency.
2) The device of this application simple structure, the power of water circulation mechanism main through the pump provides the rivers field condition for the device, and wherein circulation line's design not only can effectively reduce the energy consumption, provide the experiment rivers field of sufficient velocity of flow, but also can effectively reduce the occupation space of device.
Drawings
FIG. 1 is a schematic perspective view of a wave wall resistance testing device according to the present application;
FIG. 2 is a front view of the present invention showing a resistance test apparatus for a wavy wall;
FIG. 3 is a schematic view of a connection structure between the wave wall vibration telescopic mechanism and a test section straight pipe;
FIG. 4 is a schematic view of a connection structure between the fluctuating wall surface vibration telescopic mechanism and a test section straight pipe according to the present application in a state that the test section straight pipe is detached;
FIG. 5 is a schematic structural view of the wave wall vibration extension mechanism of the present application;
FIG. 6 is a schematic view of the camshaft of the present application and an eccentric disc cam provided on the camshaft;
FIG. 7 is a schematic structural view of a bearing housing of the present application;
FIG. 8 is a schematic structural view of the telescopic support rod of the present application;
FIG. 9 is a side plan view of the deformable flexible wall of the present application;
FIG. 10 is a side bottom view of the deformable flexible wall of the present application;
in the figure: 1-a support frame, 101-a stepping motor, 102-a quincunx coupling, 103-a cam shaft, 104-a bearing seat, 104 a-a bearing, 105-an eccentric disc cam, 2-a circulation pipeline, 201-a reducing corner pipe, 202-a first stable section pipe, 203-a contraction pipe, 204-a test section straight pipe, 205-a divergence pipe, 206-a second stable section pipe, 207-an equal diameter corner bent pipe, 208-a water return reducing pipe, 3-a pressure taking structure, 4-a U-shaped frame, 5-a deformable flexible wall surface, 501-a flexible support plate, 502-a second support plate frame, 502 a-a limiting rod, 503-a first support plate frame, 504-a waterproof deep groove ball bearing, 6-a support frame, a 7-a water pump and 8-a telescopic support rod, 801-roller, 802-roller carriage, 803-first spring foot, 804-spring, 805-second spring foot, 806-threaded tube, 807-threaded rod, 9-magnetic fluid seal.
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example (b): compare FIGS. 1-10
The utility model provides a warp wall resistance testing arrangement based on fish body surface structure, includes undulant wall vibration telescopic machanism, hydrologic cycle mechanism and pressure differential resistance test mechanism, hydrologic cycle mechanism includes water pump 7 and circulation line 2, and the delivery port of water pump 7 by circulation line 2 is connected with the water inlet of water pump 7, forms the rivers circulation circuit.
The fluctuating wall surface vibration telescopic mechanism comprises a motor transmission device, a deformable flexible wall surface 5 and a plurality of telescopic supporting rods 8 which are uniformly and fixedly arranged at the bottom of the deformable flexible wall surface 5 at intervals and can be telescopically deformed in the length direction, all the telescopic supporting rods 8 are positioned on the same plane, the upper end of each telescopic supporting rod 8 vertically extends into a test section straight pipe 204 through a magnetic fluid sealing piece 9 correspondingly arranged at the bottom of the test section straight pipe 204 (the magnetic fluid sealing piece 9 is arranged to prevent the liquid in the test section straight pipe 204 from seeping downwards), and the bottom of the deformable flexible wall surface 5 is fixedly connected, so that the deformable flexible wall surface 5 is horizontally arranged in the middle of the inside of the test section straight pipe 204; the motor transmission device supports the lower end of the telescopic supporting rod 8 in a propping mode, the telescopic supporting rod 8 can do up-and-down reciprocating motion in a vertical plane under the driving action of the motor transmission device, the moving directions of the two adjacent telescopic supporting rods 8 are opposite, and the deformable flexible wall surface 5 is driven to be bent and deformed into a sine-wave-shaped fluctuation wall surface.
As can be seen from a comparison of fig. 1 and 2, the device of the present application further includes a support frame 1, and a U-shaped frame 4 is disposed on an upper surface of the support frame 1. The circulating pipeline 2 comprises a reducing corner pipe 201, a first stabilizing section pipe 202, a contraction pipe 203, a testing section straight pipe 204, a divergence pipe 205, a second stabilizing section pipe 206, an equal-diameter corner elbow 207 and a backwater reducing section 208, and a water outlet of the water pump 7 is connected with a water inlet of the water pump 7 sequentially through the reducing corner pipe 201, the first stabilizing section pipe 202, the contraction pipe 203, the testing section straight pipe 204, the divergence pipe 205, the second stabilizing section pipe 206, the equal-diameter corner elbow 207 and the backwater reducing section 208 to form a water flow circulating loop.
Referring to fig. 2, the convergent tube 203 and the divergent tube 205 are mirror symmetric, that is, along the horizontal extension direction of the water flow in the test section straight tube 204, the diameter of the convergent tube 203 is gradually reduced, and the diameter of the divergent tube 205 is gradually enlarged. The pipe diameter of the test section straight pipe 204 is the same as that of the end with the smaller caliber of the contracted pipe 203, and the pipe diameters of the first stable section pipe 202, the second stable section pipe 206 and the equal-diameter corner bent pipe 207 are all the same as that of the end with the larger caliber of the contracted pipe 203. The top of the first stable section pipe 202 is provided with a water injection plug 2a, the top of the second stable section pipe 206 is provided with an air discharge plug, and the bottom of the equal-diameter corner elbow 207 is provided with a water outlet plug. The process of filling the circulation line 2 with water is as follows: closing the water outlet plug, opening the air discharging plug while injecting water to discharge gas in the pipeline until a small amount of liquid appears in the air outlet hole, enabling the flow to reach the design flow and the air discharging plug to be full of water, closing the water injection plug 2a and the air discharging plug, starting the water pump, and providing the flow field condition of water circulation to carry out experiments.
In the application, a closed circulation pipeline structure is adopted to obtain ideal flow velocity distribution, and meanwhile, cost and energy are saved. The closed circulation pipeline is designed based on the small water tunnel criterion, energy is conveyed to circularly flowing liquid through the water pump, and diversified controllable flow field spaces are provided for resistance test experiments.
The test section straight pipe 204 is a controllable flow field space for performing resistance test experiments, and is a key index for evaluating the performance of the device, wherein the test section straight pipe is used for controlling parameters such as turbulence, flow velocity and pressure of water flow of the test section straight pipe to improve resistance test precision and stability. The constriction 203 is used to accelerate the water flow uniformly to reach the flow rate range required by the resistance test experiment and to reduce the turbulence of the water flow to some extent.
The divergent pipe 205, which may also be referred to as a diffuser section, may reduce the speed and increase the pressure of the high-speed water flow flowing out from the straight pipe 204 of the test section, convert a part of the kinetic energy of the water flow into pressure energy, so that the water flow flows at a low speed in the subsequent pipeline to reduce the pressure loss, and improve the energy efficiency ratio of the pipeline system. The primary function of the second stabilizing section 206 is to stabilize the incoming water flow into the constant diameter corner elbow 207; the constant-diameter corner elbow 207 mainly has the functions of guiding water flow to enter the next section of pipeline without prerotation, and a flow deflector can be arranged for increasing the flow guide degree and improving the energy efficiency ratio; the backwater reducing pipe section 208 is used for gently conveying water flow to enter the water pump 7, and the reducing corner pipe 201 is mainly used for connecting a water outlet of the water pump 7 with an inlet of the first stabilizing section pipe 202.
As can be seen from fig. 1, the backwater reducing pipe section 208 is disposed inside the support frame 1, two ends of the backwater reducing pipe section 208 penetrate out of the support frame 1 and are respectively connected with the equal-diameter corner elbow 207 and the water inlet of the water pump 7, and a pair of support frames 6 is fixedly disposed between the upper surface of the U-shaped frame 4 and the bottom of the test section straight pipe 204 (to support and fix the test section straight pipe 204). The motor transmission device is fixedly arranged on the upper surface of the U-shaped frame 4, so that the occupied space area of the device can be effectively reduced.
As can be seen from a comparison of the drawings in FIG. 3 and FIG. 4, the test section straight pipe 204 is formed by two semicircular pipes in a sealing and splicing manner (the test section straight pipe 204 can be disassembled, and the deformable flexible wall surface 5 is installed in the test section straight pipe 204, and the detachable structure is arranged so as to carry out the coupling experiment with different non-smooth wall surfaces), the differential pressure resistance testing mechanism comprises two pressure taking structures 3 which are arranged at the top of the test section straight pipe 204 and are close to openings at two ends, and each pressure taking structure 3 is connected with a pressure flow velocity sensor. When liquid passes through the test section straight pipe 204, the static pressure and the flow velocity in the cross section of the pipeline where the pressure taking structure 3 is installed can be measured by the pressure and flow velocity sensor installed at the tail end of the pressure taking structure 3. According to Bernoulli's equation, if the water flow pressure difference before and after the inlet and outlet of the test section straight pipe 204 is used to replace the expression resistance loss, namely for different drag reduction tests, only the static pressure difference between the inlet and outlet when the fluid flows through the test section straight pipe 204 is measured. In order to eliminate the influence of the upper end of the telescopic supporting rod 8 on the flow field, a waterproof strain gauge is welded at the upper end of the telescopic supporting rod 8 so as to ensure the accuracy of the experiment.
As can be seen from a comparison of fig. 5 to 8, the motor transmission device includes a stepping motor 101 (the stepping motor 101 is fixedly disposed on the upper surface of the U-shaped frame 4), a quincunx coupler 102 and a cam shaft 103, an output shaft of the stepping motor 101 is fixedly connected to one end of the cam shaft 103 through the quincunx coupler 102, a plurality of eccentric disc cams 105 with different initial phases are uniformly arranged on the cam shaft 103 at intervals (as shown in fig. 5 and 6, the number of the eccentric disc cams 105 is 5 in this embodiment, and each eccentric disc cam reciprocates in the vertical direction. in the process of assembling the eccentric disc cams 105 to the cam shaft 103, the eccentric disc cams can be assembled from two ends of the cam shaft 103 to the center, that is, the eccentric disc cams 105 at the center of the cam shaft 103 are installed first, and as shown in fig. 6, the phase difference between two adjacent eccentric disc cams 105 is 90 °, the initial phases of the 5 eccentric disc cams 105 in fig. 5 are 0 °, 90 °, 180 °, 270 °, and 360 ° respectively in the horizontal direction along the end of the cam shaft 103 close to the stepping motor 101 toward the end of the cam shaft 103 away from the stepping motor 101, so as to output a sinusoidal waveform; the number of the eccentric disc cams 105 is the same as that of the telescopic support rods 8, and the eccentric disc cams 105 are correspondingly arranged below the telescopic support rods 8 and used for tightly supporting the telescopic support rods 8.
In order to improve the operation stability of the motor transmission device, the motor transmission device further comprises a pair of bearing blocks 104 fixedly arranged on the upper surface of the U-shaped frame 4, and the pair of bearing blocks 104 are arranged at two ends of the cam shaft 103 to support the cam shaft. As can be seen from fig. 7, the bearing block 104 is provided with a bearing 104a at the upper end, and the cam shaft 103 can be fittingly mounted on the bearing block 104 through the bearing 104a, so that the cam shaft 103 can rotate on the bearing block 104 under the rotation action of the stepping motor 101. As can be seen from a comparison of fig. 5, all eccentric disc cams 105 on the camshaft 103 are arranged between the two bearing blocks 104.
As can be seen from a comparison of fig. 8, the telescopic supporting rod 8 comprises a roller 801, a roller bracket 802, a first spring foot pad 803, a spring 804, a second spring foot pad 805, a threaded pipe 806 and a threaded rod 807 which are sequentially arranged from bottom to top, wherein a female thread is arranged in the threaded pipe 806, a matched male thread is arranged at the lower end of the threaded rod 807, and the lower end of the threaded rod 807 is in threaded connection with the threaded pipe 806 in a matched manner (so that the threaded rod 807 is installed on the threaded pipe 806 in a height-adjustable manner); the upper end of the threaded rod 807 vertically extends into the test section straight pipe 204 through the magnetic fluid sealing element 9 at the bottom of the test section straight pipe 204 and is fixedly connected with the bottom of the deformable flexible wall surface 5.
The eccentric disc cam 105 tightly supports the roller 801 at the bottom of the telescopic support rod 8. The center of the roller 801 is provided with a horizontal threaded hole, a bolt is in threaded connection with the threaded hole of the roller 801 in a matching manner, and the roller 801 is fixedly mounted on the roller bracket 802 through the bolt (namely, the roller 801 is ensured not to relatively slide or deform, and the roller 801 does not roll); the thickness of the roller 801 is the same as that of the eccentric disc cam 105, and the thickness surface of the roller 801 is closely contacted with the thickness surface of the corresponding eccentric disc cam 105, thereby increasing the abutting contact area between the eccentric disc cam 105 and the roller 801. The purpose of the spring 804 provided on the telescopic support rod 8 is to "compensate for the vertical stroke difference caused by the rolling of the eccentric disc cam 105". The spring 804 is initially in a state of varying degrees of compression. When the eccentric disc cam 105 moves, the restoring force of the spring 804 can drive the curved wall of the deformable flexible wall 5 to restore the horizontal shape.
It can be seen that the stepping motor 101 drives the eccentric disc cams 105 with different adjacent phases to realize up-down cyclic reciprocating motion, the eccentric disc cams 105 tightly support the rollers 801 at the bottom of the telescopic supporting rod 8, and the reciprocating motion is transmitted to the deformable flexible wall surface 5 through the telescopic supporting rod 8, so that the deformable flexible wall surface 5 is bent and deformed to realize sinusoidal motion. Wherein threaded rod 807 of telescopic support rod 8 is installed on threaded pipe 806 with adjustable height, can conveniently adjust telescopic support rod 8's length like this, and then change the amplitude of the sinusoidal wave form of the crooked formation of flexible wall 5 of flexible, the cycle of sinusoidal wave form is then controlled by step motor 101, realizes diversified drag reduction experiment demand from this.
Compare fig. 9 and fig. 10, the material of flexible wall surface of flexible 5 is for pressing from both sides stainless steel network plywood, and flexible wall surface of flexible 5 includes two the same flexible extension boards 501, the tip of two flexible extension boards 501 aligns the laminating and glues the upper surface at first support grillage 503 through gluing agent in the lump, all is equipped with a plurality of second support grillages 502 on every flexible extension board 501, and second support grillage 502 top surface is equipped with the slot that matches with flexible extension board 501 width, flexible extension board 501 cooperation is inserted and is located in the slot, still be equipped with on the slot of second support grillage 502 and be used for carrying out spacing gag lever post 502a to flexible extension board 501, gag lever post 502a and flexible extension board 501's width direction parallel.
The sum of the number of the first supporting plate frames 503 and the second supporting plate frames 502 on the deformable flexible wall surface 5 is the same as the number of the telescopic supporting rods 8. The bottoms of the first support plate frame 503 and the second support plate frame 502 are respectively provided with a waterproof deep groove ball bearing 504, the waterproof deep groove ball bearing 504 at the bottom of the first support plate frame 503 and the waterproof deep groove ball bearing 504 at the bottom of each second support plate frame 502 are respectively and fixedly connected with the upper ends of different telescopic support rods 8 in a sealing manner (as can be seen from fig. 5, a telescopic support rod 8 is arranged below the first support plate frame 503, and a telescopic support rod 8 is correspondingly arranged on each second support plate frame 502); the end parts of the two flexible support plates 501, which are far away from the first support plate frame 503, are arranged in a hanging manner (namely, the end parts of the two ends of the deformable flexible wall surface 5 are not provided with the second support plate frame 502, so that the deformable flexible wall surface 5 has a certain deformation allowance, the end parts of the flexible support plates 501, which are far away from the first support plate frame 503, are in a hanging state, the length of the hanging parts can be used for compensating the length change of the deformation wall surface during fluctuation, and the wall surface is prevented from being broken or collapsed flatly, and the middle parts of the flexible support plates 501 stretch into the second support plate frame 502 provided with the slots to be freely stretched and retracted, so that the deformation.
Wherein, first support grillage 503 and second support grillage 502 bottom all set up the aim at of waterproof deep groove ball bearing 504: the threaded rod 807 on the telescopic supporting rod 8 is directly screwed, so that the mounting height of the threaded rod 807 on the threaded pipe 806 can be changed, the upper end of the threaded rod 807 does not need to be taken down from the bottom of the deformable flexible wall surface 5, and the operation is convenient and fast.
At the beginning of the experiment in this embodiment, the stepper motor is activated, causing the eccentric disc cam 105 to rotate. The rotation of the eccentric disc cam 105 causes the telescopic support rod 8 against which it bears to reciprocate in the vertical direction, causing the spring 804 of the telescopic support rod 8 to be compressed and the movement of the telescopic support rod 8 to be transmitted to the deformable flexible wall 5. Due to the different phases of the two adjacent eccentric disc cams 105, the two flexible support plates 501 connected with the first support plate frame 503 and the second support plate frame 502 move differently at the same time, that is, the output of the whole deformable wall surface presents a sine wave shape. And then starting the water pump to provide a stable flow field environment.
The statements in this specification merely set forth a list of implementations of the inventive concept and the scope of the present invention should not be construed as limited to the particular forms set forth in the examples.
Claims (10)
1. A deformation wall surface resistance testing device based on a fish body surface structure is characterized by comprising a fluctuation wall surface vibration telescopic mechanism, a water circulation mechanism and a differential pressure resistance testing mechanism, wherein the water circulation mechanism comprises a water pump (7) and a circulation pipeline (2), and a water outlet of the water pump (7) is connected with a water inlet of the water pump (7) through the circulation pipeline (2) to form a water flow circulation loop; the circulating pipeline (2) is also provided with a water injection plug (2 a), a water outlet plug and an air discharge plug, the circulating pipeline (2) comprises a test section straight pipe (204) which is horizontally placed, and the differential pressure resistance testing mechanism can respectively detect the hydrostatic pressures of water flows at the inlet and the outlet of the test section straight pipe (204);
the fluctuating wall surface vibration telescopic mechanism comprises a motor transmission device, a deformable flexible wall surface (5) and a plurality of telescopic supporting rods (8) which are uniformly and fixedly arranged at the bottom of the deformable flexible wall surface (5) at intervals and can be telescopically deformed in the length direction, all the telescopic supporting rods (8) are positioned on the same plane, the upper end of each telescopic supporting rod (8) vertically extends into a test section straight pipe (204) through a magnetic fluid sealing piece (9) correspondingly arranged at the bottom of the test section straight pipe (204), and the bottoms of the deformable flexible wall surfaces (5) are connected and fixed, so that the deformable flexible wall surface (5) is horizontally placed in the middle of the inside of the test section straight pipe (204);
the motor transmission device tightly supports the lower end of the telescopic supporting rod (8), the telescopic supporting rod (8) can do up-and-down reciprocating motion in a vertical plane under the driving action of the motor transmission device, the moving directions of the two adjacent telescopic supporting rods (8) are opposite, and the deformable flexible wall surface (5) is driven to be bent and deformed into a sine-wave-shaped fluctuation wall surface.
2. The fish body surface structure-based deformable wall surface resistance testing device of claim 1, wherein the motor transmission device comprises a stepping motor (101), a quincunx coupling (102) and a cam shaft (103), an output shaft of the stepping motor (101) is fixedly connected with one end of the cam shaft (103) through the quincunx coupling (102), a plurality of eccentric disc cams (105) with different initial phases are uniformly arranged on the cam shaft (103) at intervals, and the phase difference between every two adjacent eccentric disc cams (105) is 90 degrees so as to output a sine waveform; the number of the eccentric disc cams (105) is the same as that of the telescopic supporting rods (8), and the eccentric disc cams (105) are correspondingly arranged below the telescopic supporting rods (8) and tightly support the telescopic supporting rods (8).
3. The fish body surface structure-based deformable wall surface resistance testing device as defined in claim 2, wherein the motor transmission device further comprises two bearing blocks (104) arranged at two ends of the cam shaft (103) for supporting the cam shaft, a bearing (104 a) is arranged at the upper end of the bearing block (104), and the cam shaft (103) is fittingly mounted on the bearing block (104) through the bearing (104 a); all eccentric disc cams (105) on camshaft (103) all set up in between two bearing blocks (104), the quantity of eccentric disc cams (105) on camshaft (103) is 5, when being close to the one end of step motor (101) along camshaft (103) and keeping away from the horizontal direction of the one end of step motor (101) towards camshaft (103) and extending, the initial phase place of 5 eccentric disc cams (105) is 0 °, 90 °, 180 °, 270 ° and 360 ° respectively.
4. The fish body surface structure-based deformable wall resistance testing device as defined in claim 2, wherein the telescopic supporting rod (8) comprises a roller (801), a roller bracket (802), a first spring foot pad (803), a spring (804), a second spring foot pad (805), a threaded pipe (806) and a threaded rod (807) which are arranged from bottom to top in sequence, a female thread is arranged in the threaded pipe (806), a matching male thread is arranged at the lower end of the threaded rod (807), and the lower end of the threaded rod (807) is in matching threaded connection with the threaded pipe (806); the upper end of the threaded rod (807) vertically extends into the test section straight pipe (204) through a magnetic fluid sealing element (9) at the bottom of the test section straight pipe (204) and is fixedly connected with the bottom of the deformable flexible wall surface (5).
5. The fish body surface structure-based deformable wall surface resistance testing device as defined in claim 4, wherein a horizontal threaded hole is formed in the center of the roller (801), a bolt is in threaded connection with the threaded hole of the roller (801), and the roller (801) is fixedly mounted on the roller bracket (802); the thickness of the roller (801) is the same as that of the eccentric disc cam (105), and the thickness surface of the roller (801) is tightly attached to the thickness surface of the corresponding eccentric disc cam (105).
6. The deformed wall resistance test device based on the fish body surface structure as claimed in claim 1, it is characterized in that the deformable flexible wall surface (5) is made of a stainless steel mesh-sandwiched rubber plate, the deformable flexible wall surface (5) comprises two identical flexible support plates (501), the end parts of the two flexible support plates (501) are aligned and attached and are glued on the upper surface of the first support plate frame (503) through adhesive, each flexible support plate (501) is provided with a plurality of second support plate frames (502), the top surfaces of the second support plate frames (502) are provided with slots matched with the width of the flexible support plates (501), the flexible support plate (501) is inserted into the slot in a matching way, the slot of the second support plate frame (502) is also provided with a limiting rod (502 a) for limiting the flexible support plate (501), the limiting rod (502 a) is parallel to the width direction of the flexible support plate (501).
7. The fish body surface structure-based deformable wall resistance testing device as defined in claim 6, wherein the sum of the number of the first supporting plate frames (503) and the number of the second supporting plate frames (502) on the deformable flexible wall (5) is the same as the number of the telescopic supporting rods (8), the bottom of each of the first supporting plate frames (503) and the second supporting plate frames (502) is provided with a waterproof deep groove ball bearing (504), and the waterproof deep groove ball bearing (504) at the bottom of each of the first supporting plate frames (503) and the waterproof deep groove ball bearing (504) at the bottom of each of the second supporting plate frames (502) are respectively and fixedly connected with the upper ends of different telescopic supporting rods (8) in a sealing manner; and one ends of the two flexible support plates (501) far away from the first support plate frame (503) are both arranged in a suspended manner.
8. The fish body surface structure-based deformable wall surface resistance testing device as defined in claim 1, wherein the test section straight pipe (204) is formed by hermetically splicing two semicircular pipes, the pressure difference resistance testing mechanism comprises two pressure taking structures (3) arranged at the top of the test section straight pipe (204) and close to openings at two ends, and each pressure taking structure (3) is connected with a pressure and flow velocity sensor.
9. The fish body surface structure-based deformable wall resistance testing device is characterized in that the circulating pipeline (2) comprises a reducing corner pipe (201), a first stabilizing section pipe (202), a contraction pipe (203), a test section straight pipe (204), a divergence pipe (205), a second stabilizing section pipe (206), an equal-diameter corner elbow pipe (207) and a return water reducing pipe section (208), and a water outlet of the water pump (7) is connected with a water inlet of the water pump (7) sequentially through the reducing corner pipe (201), the first stabilizing section pipe (202), the contraction pipe (203), the test section straight pipe (204), the divergence pipe (205), the second stabilizing section pipe (206), the equal-diameter corner elbow pipe (207) and the return water reducing pipe section (208) to form a water flow circulating loop; the contraction pipe (203) is in mirror symmetry with the divergence pipe (205), the water injection plug (2 a) is arranged at the top of the first stable section pipe (202), the air discharge plug is arranged at the top of the second stable section pipe (206), and the water outlet plug is arranged at the bottom of the equal-diameter corner elbow (207).
10. The fish body surface structure-based deformable wall surface resistance testing device according to claim 9, further comprising a support frame (1), wherein the backwater reducing pipe section (208) is arranged inside the support frame (1), and two ends of the backwater reducing pipe section (208) penetrate out of the support frame (1) and are respectively connected with the equal-diameter corner elbow (207) and a water inlet of the water pump (7); the test device is characterized in that a U-shaped frame (4) is arranged on the upper surface of the support frame (1), the motor transmission device is fixedly arranged on the upper surface of the U-shaped frame (4), and a pair of support frames (6) is fixedly arranged between the upper surface of the U-shaped frame (4) and the bottom of the test section straight pipe (204).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112033790A (en) * | 2020-10-19 | 2020-12-04 | 永康市质量技术监测研究院 | Detection apparatus for circuit board welding quality |
| CN112556984A (en) * | 2020-12-09 | 2021-03-26 | 江苏科技大学 | Underwater model resistance measurement system and test method |
| CN113188757A (en) * | 2021-01-27 | 2021-07-30 | 西北工业大学 | Hydrodynamic performance test platform and test method of simulated bat ray pectoral fin prototype |
| CN114739630A (en) * | 2022-04-15 | 2022-07-12 | 中国船舶科学研究中心 | Flexible wall surface resistance reduction and pulsation pressure reduction effect testing device and using method |
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2019
- 2019-11-20 CN CN201911143805.0A patent/CN110849581A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112033790A (en) * | 2020-10-19 | 2020-12-04 | 永康市质量技术监测研究院 | Detection apparatus for circuit board welding quality |
| CN112556984A (en) * | 2020-12-09 | 2021-03-26 | 江苏科技大学 | Underwater model resistance measurement system and test method |
| CN112556984B (en) * | 2020-12-09 | 2022-08-19 | 江苏科技大学 | Underwater model resistance measurement system and test method |
| CN113188757A (en) * | 2021-01-27 | 2021-07-30 | 西北工业大学 | Hydrodynamic performance test platform and test method of simulated bat ray pectoral fin prototype |
| CN113188757B (en) * | 2021-01-27 | 2024-01-09 | 西北工业大学 | Hydrodynamic performance test platform and test method for simulated ray pectoral fin prototype |
| CN114739630A (en) * | 2022-04-15 | 2022-07-12 | 中国船舶科学研究中心 | Flexible wall surface resistance reduction and pulsation pressure reduction effect testing device and using method |
| CN114739630B (en) * | 2022-04-15 | 2024-03-08 | 中国船舶科学研究中心 | Flexible wall surface resistance reduction and pulsation pressure reduction effect testing device and application method |
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