CN108918080B - Propeller wake field measurement system under multiplex condition - Google Patents
Propeller wake field measurement system under multiplex condition Download PDFInfo
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- CN108918080B CN108918080B CN201810188710.XA CN201810188710A CN108918080B CN 108918080 B CN108918080 B CN 108918080B CN 201810188710 A CN201810188710 A CN 201810188710A CN 108918080 B CN108918080 B CN 108918080B
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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 invention aims to provide a propeller wake field measuring system under multiple working conditions, which comprises a water tank, a top cross bar, a middle cross bar, a bottom cross bar, a first stepping motor and a second stepping motor, wherein a first guide rail is arranged on the left side above the water tank, a second guide rail is arranged on the right side above the water tank, a first trailer is arranged on the first guide rail, a second trailer is arranged on the second guide rail, a first upper connecting rod is fixed above the first trailer, a second upper connecting rod is fixed above the second trailer, the top cross bar is fixed on the first upper connecting rod and the second upper connecting rod, the middle cross bar is arranged below the top cross bar, the lower part of the middle cross bar is fixedly connected with a first lower connecting rod and a second lower connecting rod, the bottoms of the first lower connecting rod and the second lower connecting rod are fixedly connected with the bottom cross bar, a fixed top plate is fixed on one side of the water tank. The invention is not only suitable for measuring the tail flow field under the dynamic motion of the propeller, but also suitable for measuring the tail flow field of the conventional propeller without special motion mode.
Description
Technical Field
The invention relates to a flow field measuring system, in particular to a propeller wake field measuring system.
Background
Propeller propulsion is the main propulsion method of ships at present, and is the focus of research by various national scholars. The wake flow of the propeller is related to the cavitation of the propeller, noise, structural problems and the like, and is a research hotspot of various large research institutions. With the increasing demand for the moving performance of the propeller under the actual working condition, the demand for predicting the hydrodynamic performance of the propeller in real conditions such as heaving and steering with the ship is further provided. Computational Fluid Dynamics (CFD) is favored because of its unique advantages of low cost, high speed, complete data, and capability of simulating various different operating conditions, but the reliability of the computational results is also more important. The PIV (Particle Image Velocimetry) technique has attracted attention in recent years because of its characteristics of measuring flow field without interference, transient state and full field velocity measurement. A powerful experimental testing technique, such as PIV, can be used as an important tool for verifying models or discovering new physical phenomena on the basis of the lack or lack of models of the existing computational models. At present, the records of the PIV measurement of the wake field under the non-design working condition of the propeller are very rare at home and abroad.
Disclosure of Invention
The invention aims to provide a propeller wake field measuring system under multiple working conditions based on a PIV technology.
The purpose of the invention is realized as follows:
the invention relates to a propeller wake field measuring system under multiple working conditions, which is characterized in that: comprises a water tank, a top cross rod, a middle cross rod, a bottom cross rod, a first stepping motor and a second stepping motor, wherein the left side above the water tank is provided with a first guide rail, the right side above the water tank is provided with a second guide rail, the first guide rail is provided with a first trailer, the second guide rail is provided with a second trailer, the first trailer is fixed above the first trailer, the second trailer is fixed above the second trailer, the first upper connecting rod and the second upper connecting rod are fixed with the top cross rod, the top cross rod is provided with the first stepping motor, the bottom of the first stepping motor is connected with a lead screw, the middle cross rod is arranged below the top cross rod, the middle cross rod is provided with a threaded hole, the two ends of the middle cross rod are provided with round holes, the lead screw passes through the threaded hole and is matched with the threaded hole, the first upper connecting rod and the second upper connecting rod respectively pass through the round holes at the two ends of the, first slide bar is installed respectively to connection piece lower part, the second slide bar, first slide bar passes through laser base installation laser instrument, the second slide bar passes through camera pedestal installation camera, well horizontal pole lower part fixedly connected with first lower connecting rod and second lower connecting rod, the bottom cross rod of the bottom fixed connection of first lower connecting rod and second lower connecting rod, install the angle appearance on the bottom cross rod, angle appearance top installation second step motor, screw system is connected to the angle appearance below, basin one side is fixed with fixed roof, fixed roof sub-unit connection has the bracing piece, the bracing piece lower extreme is fixed on unable adjustment base, be equipped with the reflector on the bracing piece.
The present invention may further comprise:
1. the laser base can rotate on the first slide bar, and the camera base can rotate on the second slide bar.
2. The reflector can rotate around the support rod in cooperation with the rotation of the laser.
3. When a flow field of a transverse section of a propeller wake field is measured, the polishing angle of a laser is parallel to the surface of the propeller; when the flow field of the longitudinal section of the propeller wake field is measured, the laser irradiates the reflector, the angle of the reflector is adjusted, and the laser is reflected to different longitudinal section positions of the propeller wake field by the reflector.
The invention has the advantages that: the invention adopts the form of combining the encoder and the stepping motor, realizes the dynamic motion (including the heave motion and the steering motion) of the model, and has simple structure and convenient operation. The middle cross bar skillfully connects the trailer system on the track and the camera-laser device in series, so that the complete synchronous movement of the measuring device and the model to be measured can be realized. The rotation angle adjusting function of the camera-laser device can realize multi-angle and multi-direction full flow field measurement, greatly saves the time cost for replacing and debugging the device, improves the measurement efficiency, and has simple structure and high feasibility. The heave movement form of the propeller system is ingeniously realized by adopting the special structure of the encoder, the stepping motor and the screw rod. The invention is not only suitable for measuring the tail flow field under the dynamic motion of the propeller, but also suitable for measuring the tail flow field of the conventional propeller without special motion forms (without starting an encoder and a stepping motor). The invention realizes the utilization rate of the device to the maximum extent, greatly saves the cost, has simple operation and high measurement efficiency, is easy to process and popularize, can effectively solve the PIV measurement problem of a complex wake field under the non-design working condition of the propeller, and can also solve the omnibearing flow field measurement problem in the PIV measurement of the wake field of the propeller.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partial schematic view of the present invention;
fig. 3 is a schematic diagram of a measuring laser light path.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to fig. 1-3, the invention comprises a rectangular water tank 1, the water tank 1 is made of organic glass with good light transmittance, a guide rail 2 is arranged on the left side above the water tank, a guide rail 16 is arranged on the right side, a trailer 7 and a trailer 14 are arranged on the guide rails on the two sides, and the trailer system achieves a preset towing speed through a controllable gear motor. Trailer 7 and trailer 14 top respectively fixedly connected with go up connecting rod 6 and go up connecting rod 15, go up connecting rod top fixedly connected with top horizontal pole 5, be connected with step motor 3 on the top horizontal pole 5, the last encoder 4 that is equipped with of step motor 3, step motor 3 bottom is connected with lead screw 31, horizontal pole 30 in being equipped with on the lead screw 31, be equipped with the smooth round hole that the connecting rod was passed respectively at threaded hole and both ends in the middle of the horizontal pole 30, well horizontal pole 30 can be on last connecting rod frictionless slip. The heave movement form of the propeller system 24 is written into the encoder 4 in the form of an input motion equation, the encoder 4 controls the stepping motor 3, and the stepping motor 3 realizes the heave movement form of the middle cross rod 30 by controlling the rotation rate of the screw rod 31. The laser polishing machine comprises a middle cross rod 30, a connecting plate 8 is fixedly connected to one side of the middle cross rod 30, a connecting plate 9 is fixedly connected to the bottom of the connecting plate 8, a sliding rod 18 and a sliding rod 19 are mounted on the lower portion of the connecting plate 9, a laser base 23 is mounted on the sliding rod 18, a laser 22 is mounted on the laser base 23, and the laser base 23 can rotate on the sliding rod 18, so that different laser polishing angles are achieved. The sliding rod 19 is provided with a camera base 20, the camera base 20 is provided with a camera 21, and the camera base 20 can rotate on the sliding rod 19, so that different camera shooting angles can be realized. The lower portion of the middle cross rod 30 is fixedly connected with a lower connecting rod 17 and a lower connecting rod 29, the bottom of the lower connecting rod is fixedly connected with a bottom cross rod 25, an angle instrument 26 is arranged on the bottom cross rod 25, a stepping motor 27 is arranged above the angle instrument 26, an encoder 28 is arranged on the stepping motor 27, a propeller system 24 is connected below the angle instrument 26, the propeller system 24 comprises a propeller, a cabin and a support, and the angle instrument 26 can display and monitor the steering angle of the propeller system 24 in real time. The form of the steering motion of the propeller system 24 is written into the encoder 28 by means of an input motion equation, and the encoder 28 controls the stepping motor 27, thereby achieving the steering motion of the propeller system 24. A fixed top plate 10 is fixedly arranged at one end of the water tank 1, a supporting rod 12 is connected to the lower portion of the fixed top plate 10, the lower end of the supporting rod 12 is fixed on a fixed base 13, a reflecting mirror 11 is arranged on the supporting rod 12, and the reflecting mirror 11 can rotate around the supporting rod 12 and is matched with the rotation of a laser 22, so that lasers at different angles are reflected, and propeller wake flow field measurement of different longitudinal sections is realized. In the figure, all the measuring devices connected with the middle cross bar 30 can make heave motion along with the middle cross bar 30, and all the measuring devices directly or indirectly connected with the trailer can make heave motion along with the trailer system, and it should be noted that the motor for controlling the rotating speed of the propeller and the force-measuring balance for measuring the thrust and the torque of the propeller are both contained in the cabin body of the propeller system 24.
The measurement system can measure the transverse section flow field of the propeller wake field and can also measure the longitudinal section flow field of the propeller wake field. This measurement system can carry out the measurement of screw wake field under the different operating modes simultaneously, include: the method comprises the steps of conventional propeller wake field measurement under different forward speed coefficients in a straight-ahead driving state, propeller wake field measurement in a steering state and propeller wake field measurement in a heaving motion state. When measuring the flow field of the transverse section of the propeller wake field, the polishing angle of the laser 22 should be parallel to the surface of the propeller; when measuring the longitudinal section flow field of the propeller wake field, the laser 22 should be irradiated onto the reflective mirror 11, the angle of the reflective mirror 11 is adjusted, and the laser is reflected to different longitudinal section positions of the propeller wake field by using the reflective mirror 11. The following description will be made of a measurement method taking the measurement of the propeller wake field in a heave motion state as an example. Firstly, selecting a section to be measured according to a measuring working condition, and calibrating a measuring system. The camera 21 and the laser 22 are adjusted to the appropriate measurement position and measurement angle, and the laser 22 is turned on. Starting a motor for controlling the rotating speed of the propeller, adjusting the rotating speed of the propeller to a preset value, writing the heave motion rule of the model to be tested into the encoder 4 in a form of inputting a motion equation, and starting the stepping motor 3 to enable the model to be tested to perform heave motion according to a certain rule. The trailer system is started and runs at a certain speed, the camera 21 is started to shoot after the speed of the trailer system is stable, the camera 21 is closed when the trailer stops, and the laser 22 is closed. The trailer system is inverted. And selecting a new measuring section according to a new measuring working condition, adjusting the corresponding angles of the camera 21 and the laser 22, and repeating the experiment.
The technical scheme adopted by the invention for solving the technical problems is as follows: including the cuboid basin, the basin is made by the better organic glass of light transmissivity, and the guide rail is all equipped with to its top left and right sides, is equipped with trailer system on the guide rail of both sides, and trailer system reaches predetermined speed of towing through controllable gear motor. The upper connecting rod is fixedly connected to the two side trailers respectively, the top end of the upper connecting rod is fixedly connected with a top cross rod, a stepping motor is connected to the top cross rod, an encoder is arranged on the stepping motor, the bottom of the stepping motor is connected with a lead screw, a middle cross rod is arranged on the lead screw, a threaded hole is formed in the middle of the middle cross rod, smooth round holes penetrating through the upper connecting rod are formed in the two ends of the middle cross rod respectively, and the middle cross rod can slide on the upper connecting rod without. The heave movement form of the propeller system is written into the encoder in a form of inputting a motion equation, the encoder controls the stepping motor, and the stepping motor realizes the heave movement form of the middle cross rod by controlling the rotation rate of the screw rod. One side of the middle cross rod is fixedly connected with a connecting plate, the bottom of the connecting plate is fixedly connected with a connecting sheet, two sliding rods are arranged at the lower part of the connecting sheet, a laser base is arranged on one sliding rod, a laser is arranged on the laser base, and the laser base can rotate on the sliding rod, so that different laser polishing angles are realized; the camera base is installed on another slide bar, install the camera on the camera base, the camera base can rotate on the slide bar to realize different camera shooting angles. The lower portion of the middle cross rod is fixedly connected with two lower connecting rods, the bottom of each lower connecting rod is fixedly connected with a bottom cross rod, an angle meter is arranged on each bottom cross rod, a stepping motor is arranged above each angle meter, an encoder is arranged on each stepping motor, a propeller system is connected below each angle meter, each propeller system comprises a propeller, a cabin and a support, and the angle meters can display and monitor the steering angle of the propeller systems in real time. The steering motion form of the propeller system is written into an encoder in a form of inputting a motion equation, and the encoder controls the stepping motor, so that the steering motion of the propeller system is realized. The measuring device is characterized in that a fixed top plate is fixedly arranged at one end of the water tank, a supporting rod is connected to the lower portion of the fixed top plate, the lower end of the supporting rod is fixed on a fixed base, a reflecting mirror is arranged on the supporting rod, the reflecting mirror can rotate around the supporting rod and is matched with a laser to rotate, so that laser at different angles is reflected, and measurement of propeller wake fields with different longitudinal sections is realized. All the measuring equipment connected with the middle cross bar can do heave movement along with the middle cross bar, all the measuring equipment directly or indirectly connected with the trailer can move along with the trailer system, and it is noted that the motor for controlling the rotating speed of the propeller and the force measuring days for measuring the thrust and the torque of the propeller are averagely contained in the cabin body of the propeller system.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method comprises the following steps:
1, selecting a section to be measured according to a measuring working condition, and calibrating a measuring system.
2, adjusting the camera and the laser to the proper measuring position and measuring angle, and starting the laser.
And 3, starting a motor for controlling the rotating speed of the propeller, and adjusting the rotating speed of the propeller to a preset value.
And 4, writing the heave motion rule of the model to be detected into the encoder in a form of inputting a motion equation, and starting the stepping motor to enable the model to be detected to perform heave motion according to a certain rule.
And 5, starting the trailer system, driving at a certain navigational speed, and starting the camera to shoot after the navigational speed of the trailer system is stable.
6 when the trailer stops, the camera is turned off, and the laser is turned off.
And 7, rewinding the trailer system to the original position, selecting a new measuring section according to a new measuring working condition, adjusting corresponding angles of the camera and the laser, and repeating the experiment.
The cuboid water tank is made of organic glass with good light transmittance. One end of the water tank is fixedly provided with a fixed top plate, the lower part of the fixed top plate is connected with a supporting rod, the lower end of the supporting rod is fixed on a fixed base, and the supporting rod is provided with a reflecting mirror which can rotate around the supporting rod and is matched with the rotation of a laser, so that laser with different angles is reflected, and the measurement of propeller wake fields with different longitudinal sections is realized. The trailer system is arranged on the left guide rail and the right guide rail, the trailer system achieves a preset dragging speed through the controllable gear motor, and all measuring equipment directly or indirectly connected with the trailer system can move along with the trailer system. The trailer system is respectively fixedly connected with a pair of upper connecting rods, the top ends of the upper connecting rods are fixedly connected with a top cross rod, a stepping motor is connected onto the top cross rod, an encoder is arranged on the stepping motor, the bottom of the stepping motor is connected with a lead screw, a middle cross rod is arranged on the lead screw, a threaded hole is formed in the middle of the middle cross rod, two ends of the middle cross rod are respectively provided with a smooth round hole penetrating through the upper connecting rods, and the middle cross rod can. The heave movement form of the propeller system is written into the encoder in the form of an input motion equation, the encoder controls the stepping motor, and the stepping motor controls the rotation rate of the screw rod so as to realize the heave movement form of the middle cross rod. One side of the middle cross rod is fixedly connected with a connecting plate, the bottom of the connecting plate is fixedly connected with a connecting sheet, the lower part of the connecting sheet is provided with two sliding rods, one of the sliding rods is provided with a laser base, the laser base is provided with a laser, and the laser base can rotate on the sliding rod, so that different laser polishing angles are realized; the camera base is installed on another slide bar, and the camera is installed on the camera base, and the camera base can rotate on the slide bar to realize different camera shooting angles. The lower part of the middle cross rod is fixedly connected with two lower connecting rods, the bottom of each lower connecting rod is fixedly connected with a bottom cross rod, an angle meter is arranged on each bottom cross rod, a stepping motor is arranged above each angle meter, a coder is arranged on each stepping motor, a propeller system is connected below each angle meter, and each propeller system comprises a propeller, a cabin and a support. The angle meter can display and monitor the steering angle of the propeller system in real time. The steering motion form of the propeller system is written into the encoder in the form of an input motion equation, and the encoder controls the stepping motor, so that the steering motion of the propeller system is realized. All the measuring equipment connected with the middle cross rod can do heave movement along with the middle cross rod.
Claims (5)
1. The utility model provides a screw wake field measurement system under multiplex condition, includes basin, top horizontal pole, well horizontal pole, end horizontal pole, first step motor, second step motor, laser instrument, first trailer, second trailer, characterized by: a first guide rail is arranged on the left side above the water tank, a second guide rail is arranged on the right side above the water tank, a first trailer is arranged on the first guide rail, a second trailer is arranged on the second guide rail, a first upper connecting rod is fixed above the first trailer, a second upper connecting rod is fixed above the second trailer, a top cross rod is fixed on the first upper connecting rod and the second upper connecting rod, a first stepping motor is arranged on the top cross rod, a lead screw is connected with the bottom of the first stepping motor, a middle cross rod is arranged below the top cross rod, a threaded hole is arranged in the middle of the middle cross rod, round holes are arranged at both ends of the middle cross rod, the lead screw penetrates through the threaded hole and is matched with the threaded hole, the first upper connecting rod and the second upper connecting rod respectively penetrate through the round holes at both ends of the middle cross rod, a connecting plate is fixed on one side of the middle cross rod, a connecting plate is fixed at the bottom of the, the second slide bar passes through camera pedestal mounting camera, and well horizontal pole lower part fixedly connected with first connecting rod and second connecting rod down, the bottom horizontal pole of the bottom fixed connection of first connecting rod and second connecting rod down, installation angle appearance on the bottom horizontal pole, angle appearance top installation second step motor, screw system is connected to the angle appearance below, basin one side is fixed with fixed roof, fixed roof sub-unit connection has the bracing piece, the bracing piece lower extreme is fixed on unable adjustment base, is equipped with the reflector on the bracing piece.
2. The propeller wake field measurement system under multiple operating conditions of claim 1, characterized in that: the laser base can rotate on the first slide bar, and the camera base can rotate on the second slide bar.
3. The propeller wake field measurement system under multiple operating conditions of claim 1 or 2, characterized in that: the reflector can rotate around the support rod in cooperation with the rotation of the laser.
4. The propeller wake field measurement system under multiple operating conditions of claim 1 or 2, characterized in that: when a flow field of a transverse section of a propeller wake field is measured, the polishing angle of a laser is parallel to the surface of the propeller; when the flow field of the longitudinal section of the propeller wake field is measured, the laser irradiates the reflector, the angle of the reflector is adjusted, and the laser is reflected to different longitudinal section positions of the propeller wake field by the reflector.
5. The propeller wake field measurement system under multiple operating conditions of claim 3, characterized in that: when a flow field of a transverse section of a propeller wake field is measured, the polishing angle of a laser is parallel to the surface of the propeller; when the flow field of the longitudinal section of the propeller wake field is measured, the laser irradiates the reflector, the angle of the reflector is adjusted, and the laser is reflected to different longitudinal section positions of the propeller wake field by the reflector.
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| EP3945014A1 (en) * | 2020-07-30 | 2022-02-02 | GE Energy Power Conversion Technology Ltd. | External loading test apparatus |
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