Measuring system and measuring method for omni-directional flow field in full appendage model conduit

Abstract

The invention relates to a full appendage model in-conduit omnidirectional flow field measurement system and measurement method. The system comprises a rotatable full appendage model, a first light source, a second light source, a CCD camera and a circulating water tank. The full appendage model is fixed in a test section of the circulating water tank through the first rapier and the second rapier, the first sheet light source and the second sheet light source are symmetrically arranged outside the circulating water tank, the centers of the sheet light sources coincide with a conduit bus of the rotatable full appendage model, and the CCD camera is arranged in a middle cabin of the circulating water tank and shoots from top to bottom. The problem of omnidirectional flow field measurement in a vertical paddle axis plane between a rotor and a stator in a conduit of the full appendage model is solved by rotating the full appendage model.

Description

Technical Field

[0001] The invention relates to the technical field of flow field measurement systems, in particular to an omnidirectional flow field measurement system and a measurement method in a fully-attached model catheter. Background Art

[0002] The flow field characteristics in the duct of the full-appendage model are closely related to the low-frequency excitation force of the rotor in the duct and its induced noise and low-frequency broadband force and induced noise. In order to improve and verify the calculation method of the low-frequency excitation force and low-frequency broadband force of the rotor in the duct, it is necessary to obtain the interference-free omnidirectional flow field information in the duct through experimental means, that is, to obtain the flow field information of the rotor at different rotation phase angles in the plane perpendicular to the propeller axis between the rotor and the stator in the duct.

[0003] Currently, there is still no effective measurement system that can realize the omnidirectional flow field measurement in the fully attached model catheter. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned existing production technology, the applicant provides a system and method for measuring the omnidirectional flow field in a fully-appended model duct, thereby effectively solving the problem of measuring the omnidirectional flow field in a plane perpendicular to the propeller axis between the rotor and the stator in the fully-appended model duct, and can conveniently complete the measurement work, with overall convenient operation and good working reliability.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A system for measuring omnidirectional flow fields in a conduit of a full-appendage model, comprising a circulating water tank, wherein a test section in the circulating water tank is fixed with a full-appendage model through a first rapier and a second rapier arranged at intervals, a first light source and a second light source are symmetrically arranged outside the circulating water tank, the light source centers of the first light source and the second light source coincide with the busbar of the conduit of the full-appendage model, and a CCD camera is arranged at an upper position inside the circulating water tank;

[0007] The structure of the full-appendage model is as follows: a first segment, a second segment and a third segment are sequentially arranged from one end to the other end; a first angle control device is installed on the third segment; the second angle control device is fixed on the first segment; the second segment is fixed between the third segment and the first segment through a first support ring and a second support ring respectively; a head structure is installed on the axis of the second angle control device; the head structure controls the rotation angle through the second angle control device; a tail structure is installed on the axis of the first angle control device; the tail structure controls the rotation angle through the first angle control device; a third support ring is fixed on the tail structure; and the enclosure appendage is fixed on the head structure, the first support ring, the second support ring and the second support ring at the same time. On the support ring and the third support ring, the casing appendage rotates with the head structure, the guide tube is fixed to the tail structure through the stator, and the guide tube rotates with the tail structure; one end of the sleeve is fixed to the first angle control device, and the other end is supported on the tail structure, the two ends of the sleeve support the first bearing and the second bearing respectively, the third bearing is fixed in the shaft encoder assembly, the propeller shaft is supported on the first bearing, the second bearing and the third bearing, and is connected to the output shaft of the underwater motor through the first coupling, the underwater motor is fixed on the mounting platform of the second section, the rotor is sleeved on the propeller shaft, the shaft encoder assembly is sleeved on the propeller shaft, and the function of the shaft encoder assembly is to provide control signals to the PIV synchronous controller.

[0008] Its further technical solution is:

[0009] The third segment is fixed inside the circulating water tank via a first rapier, and the first segment is fixed inside the circulating water tank via a second rapier.

[0010] The CCD camera does not contact the water and takes pictures from top to bottom.

[0011] The first supporting ring, the second supporting ring and the third supporting ring have the same structure.

[0012] The structure of the first support ring is: including a moving ring, a cover plate, a stationary ring, a bull's eye wheel and a screw roller. 24 bull's eye wheels are evenly distributed and fixed on the stationary ring. The moving ring is sleeved on the balls of the bull's eye wheels. When the moving ring rotates, the balls of the bull's eye wheels will roll along to avoid jamming. The cover plate is fixed on both sides of the stationary ring. Twelve screw rollers are evenly distributed around the circumference. The steel balls of the screw rollers are in contact with the moving ring to limit the axial position of the moving ring.

[0013] The first angle control device and the second angle control device have the same structure.

[0014] The structure of the first angle control device is as follows: it includes a rotating shaft, a concentric tooling, a bearing chamber, a semicircular base, a bottom plate, an air disc brake, a disc brake fixing frame, an angle sensor, a sensor fixing frame, a second coupling, a reduction motor, a transition plate and a brake disc. The rotating shaft is supported in the bearing chamber by a bearing, and the bearing chamber is embedded and installed in the concentric tooling, and the bottom plate is fixed to the bearing chamber through a semicircular base; the brake disc is fixed to the rotating shaft, and the air disc brake is fixed to the bottom plate through the disc brake fixing frame. When ventilated, the air disc brake holds the brake disc tightly to lock the rotating shaft to avoid shaking of the rotating shaft during the test. The angle sensor is on the rotating shaft, and the static ring is fixed to the bottom plate through the sensor fixing frame. The angle sensor is used to feedback the angle change of the rotating shaft. The reduction motor is fixed to the bottom plate through the transition plate, and the output shaft is connected to the rotating shaft through the second coupling to control the rotation of the rotating shaft.

[0015] The structure of the shaft encoder assembly is as follows: it includes a large base, a supporting spring and an encoder, and the encoder is fixed on the large base by supporting springs which are symmetrically arranged up and down.

[0016] A bearing mounting hole is arranged in the large base.

[0017] A method for measuring the omnidirectional flow field in the full-body model catheter as claimed in claim 1, comprising the following operation process:

[0018] The first step is to install the fully attached model at the 0° angle during initial installation;

[0019] The second step is to start the underwater motor to drive the rotor to rotate;

[0020] The third step is to use the PIV phase-locked measurement technology to measure the two-dimensional flow field information on the plane coinciding with the axis in the duct under different rotor phase states according to the phase information of the shaft encoder;

[0021] Step 4: Turn off the underwater motor and stop the rotor from rotating;

[0022] The fifth step is to rotate the tube in the direction of 0°-90°-180°, and repeat the third and fourth steps to obtain the two-dimensional flow field information on the plane coinciding with the axis in the tube when the rotor is in different phase states in all regions A, B, C, and D;

[0023] The sixth step is to obtain the omnidirectional flow field information in the plane perpendicular to the propeller axis between the rotor and the stator in the fully attached duct through post-data processing.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention has a compact and reasonable structure and is easy to operate. Through the design of the full-appendage model, the full-appendage model can be fixed in a fixed state, and the two-dimensional flow field information on the plane coinciding with the propeller axis in the duct under a certain angle and different propeller phase states can be obtained by using the PIV technical means. The two-dimensional flow field information on the plane coinciding with the propeller axis in the duct under different angles and different propeller phase states can be obtained by rotating the full-appendage model. Through post-data processing, the omnidirectional flow field information in the plane perpendicular to the propeller axis between the rotor and the stator in the full-appendage duct can be obtained.

[0026] The present invention can accurately obtain the angular position of the flow field measurement plane in the conduit through the angle sensor and the air disc brake.

[0027] The present invention avoids the interference of the rotor on the shooting of the flow field in the catheter through the reasonable layout of the sheet light source and the camera shooting angle.

[0028] The present invention realizes the full flow field measurement of the plane perpendicular to the propeller axis in the duct of the full appendage model by rotating the full appendage model by 0-180 degrees and adopting the PIV technical means. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the overall arrangement diagram of the present invention.

[0030] Figure 2 It is a schematic diagram of the structure of the rotatable full-appendage model of the present invention.

[0031] Figure 3 It is a schematic structural diagram of the first support ring of the present invention.

[0032] Figure 4 It is a structural schematic diagram of the first angle control device of the present invention.

[0033] Figure 5 It is a schematic structural diagram of the shaft encoder assembly of the present invention.

[0034] Figure 6 It is the measurement principle diagram of the present invention.

[0035] Among them: 1. Fully attached model; 2. First light source; 3. Second light source; 4. CCD camera; 5. Circulating water tank;

[0036] 101, head structure; 102, first segment; 103, first support ring; 104, second segment; 105, second support ring; 106, third segment; 107, third support ring; 108, tail structure; 109, stator; 110, guide tube; 111, rotor; 112, first bearing; 113, bushing; 114, propeller shaft; 115, second bearing; 116, first angle control device; 117, shaft encoder assembly; 118, third bearing; 119, first coupling; 120, underwater motor; 121, enclosure attachment; 122, second angle control device; 123, first rapier; 124, second rapier;

[0037] 1031, dynamic ring; 1032, cover plate; 1033, static ring; 1034, bull's eye wheel; 1035, screw roller;

[0038] 11601, rotating shaft; 11602, concentric tooling; 11603, bearing chamber; 11604, semicircular base; 11605, bottom plate; 11606, air disc brake; 11607, disc brake fixing bracket; 11608, angle sensor; 11609, sensor fixing bracket; 11610, second coupling; 11611, reduction motor; 11612, transition plate; 11613, brake disc;

[0039] 1171. Large base; 1172. Support spring; 1173. Encoder. DETAILED DESCRIPTION

[0040] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0041] like Figure 1-Figure 6 As shown, the specific structure and function of the omnidirectional flow field measurement system in a fully attached model catheter described in the present invention are as follows:

[0042] The invention mainly comprises a rotatable full-body model 1, a first light source 2, a second light source 3, a CCD camera 4 and a circulating water tank 5.

[0043] The full-appendage model 1 is fixed in the test section of the circulating water tank 5 by the first rapier 123 and the second rapier 124. The first light source 2 and the second light source 3 are symmetrically arranged outside the circulating water tank 5, and the center of the light source coincides with the duct busbar of the rotatable full-appendage model 1 to avoid the position displacement of the light sheet due to the curvature of the duct. The CCD camera 4 is arranged in the middle cabin of the circulating water tank 5, does not contact the water, and shoots from top to bottom. Through the reasonable layout of the light source and the camera shooting angle, the interference of the rotor 111 on the flow field measurement in the duct 110 is avoided.

[0044] When the full-appendage model 1 is in a fixed state, the PIV technology can be used to obtain the two-dimensional flow field information on the plane coinciding with the propeller axis in the duct at a certain angle and in different propeller phase states. By rotating the full-appendage model 1, the two-dimensional flow field information on the plane coinciding with the propeller axis in the duct at different angles and in different propeller phase states can be obtained. Through post-data processing, the omnidirectional flow field information in the plane perpendicular to the propeller axis between the rotor 111 and the stator 109 in the full-appendage duct can be obtained.

[0045] like Figure 2 As shown, the rotatable full-body model 1 includes a head 101, a first segment 102, a first support ring 103, a second segment 104, a second support ring 105, a third segment 106, a third support ring 107, a tail 108, a stator 109, a guide tube 110, a rotor 111, a first bearing 112, a sleeve 113, a propeller shaft 114, a second bearing 115, a first angle control device 116, a shaft encoder assembly 117, a third bearing 118, a first coupling 119, an underwater motor 120, a casing attachment 121, a second angle control device 122, a first rapier 123 and a second rapier 124.

[0046] The first angle control device 116 is fixed to the third segment 106 through the concentric tooling 11602, and the third segment 106 is fixed in the test section of the circulating water tank 5 through the first rapier 123. The second angle control device 122 is fixed to the first segment 102, and the first segment 102 is fixed in the test section of the circulating water tank 5 through the second rapier 124. The second segment 104 is fixed to the third segment 106 and the first segment 102 through the first support ring 103 and the second support ring 105 respectively. The head structure 101 is fixed to the axis of the second angle control device 122, and the rotation angle can be controlled by the second angle control device 122. The tail 108 is fixed to the rotation axis 11601 of the first angle control device 116, and the rotation angle can be controlled by the first angle control device 116. The third support ring 107 is fixed to the tail structure 108. The enclosure appendage 121 is respectively fixed on the head 101, the moving ring 1031 of the first support ring 103, the second support ring 105 and the third support ring 107, and can rotate with the head structure 101, while avoiding the heave caused by the long length of the enclosure appendage 121. The catheter 110 is fixed on the tail 108 through the stator 109, and can rotate with the tail 108. By controlling the head 101 and the tail structure 108 to rotate at the same angle, the circumferential angle change of the PIV measurement plane in the full-appendage model catheter can be achieved. One end of the sleeve 113 is fixed on the rotating shaft 11601 of the first angle control device 116, and the other end is supported on the tail structure 108. The first bearing 112 and the second bearing 115 are fixed at both ends of the sleeve 113, and the third bearing 118 is fixed in the large base 1171 of the shaft encoder assembly 117. The propeller shaft 114 is supported on the first bearing 112, the second bearing 115 and the third bearing 118, and is connected to the output shaft of the underwater motor 120 through the first coupling 119. The underwater motor 120 is fixed on the mounting platform of the second segment 104. The rotor 111 is sleeved on the propeller shaft 114. The shaft encoder assembly 117 is sleeved on the propeller shaft 114 and fixed on the third segment 106 through the large base 1171. The shaft encoder assembly 117 is used to provide a control signal to the PIV synchronization controller.

[0047] like Figure 3 As shown, the first support ring 103 includes a moving ring 1031, a cover plate 1032, a stationary ring 1033, a bull's eye wheel 1034, and a screw roller 1035. 24 bull's eye wheels 1034 are evenly distributed and fixed on the stationary ring 1033 in the circumferential direction. The moving ring 1031 is sleeved on the ball of the bull's eye wheel 1034. When the moving ring 1031 rotates, the ball of the bull's eye wheel 1034 will roll along to avoid jamming. The cover plate 1032 is fixed on both sides of the stationary ring 1033, and 12 screw rollers 1035 are evenly distributed in the circumferential direction. The steel balls of the screw roller 1035 are in contact with the moving ring 1031 to limit the axial position of the moving ring 1031.

[0048] like Figure 4As shown, the first angle control device 116 includes a rotating shaft 11601, a concentric tooling 11602, a bearing chamber 11603, a semicircular base 11604, a bottom plate 11605, an air disc brake 11606, a disc brake fixing frame 11607, an angle sensor 11608, a sensor fixing frame 11609, a second coupling 11610, a reduction motor 11611, a transition plate 11612 and a brake disc 11613. The rotating shaft 11601 is supported in the bearing chamber 11603 by a bearing and can rotate freely. The bearing chamber 11603 is embedded and installed in the concentric 11602. The bottom plate 11605 is fixed to the bearing chamber 11603 through the semicircular base 11604. The brake disc 11613 is fixed to the rotating shaft 11601. The air disc brake 11606 is fixed to the bottom plate 11605 through the disc brake fixing frame 11607. When ventilated, the air disc brake 11606 can hold the brake disc 11613 tightly to lock the rotating shaft 11601, thereby preventing the rotating shaft 11601 from shaking during the test. The angle sensor 11608 is on the rotating shaft 11601, and the static ring 1033 is fixed to the bottom plate 11605 through the sensor fixing frame 11609. The angle sensor 11608 is used to feedback the angle change of the rotating shaft 11601. The reduction motor 11611 is fixed to the bottom plate 11605 through the transition plate 11612, and its output shaft is connected to the rotating shaft 11601 through the second coupling 11610 to control the rotation of the rotating shaft 11601.

[0049] like Figure 5 As shown, the shaft encoder assembly 117 includes a large base 1171, a support spring 1172 and an encoder 1173. The encoder 1173 is fixed to the base through the support springs 1172 arranged symmetrically up and down. A bearing mounting hole is set in the large base 1171 to reduce the impact of the vibration of the propeller shaft 114 on the phase signal of the encoder 1173 during rotation.

[0050] The measurement method of this implementation is as follows:

[0051] The first step is to install the rotatable fully attached model to the Figure 6 0° angle position shown.

[0052] The second step is to start the underwater motor 120 to drive the rotor 111 to rotate.

[0053] In the third step, based on the phase information of the shaft encoder, the PIV phase-locked measurement technology is used to measure the two-dimensional flow field information on the plane coinciding with the axis in the conduit under different phase states of the rotor 111.

[0054] The fourth step is to turn off the underwater motor 120 and stop the rotor 111 from rotating.

[0055] Step 5: Follow Figure 6By rotating in the direction of 0°-90°-180° as shown, and repeating the third and fourth steps, the two-dimensional flow field information on the plane coincident with the axis in the conduit in different phase states of the rotor 111 in all regions of the conduits A, B, C, and D can be obtained. For example, when rotating from 0° to 90°, the regions A and D are photographed, and when rotating from 90° to 180°, the regions B and C are photographed.

[0056] In the sixth step, through post-data processing, the omnidirectional flow field information in the plane perpendicular to the propeller axis between the rotor 111 and the stator 109 in the fully attached duct can be obtained.

[0057] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A system for measuring the omnidirectional flow field in a fully attached model catheter, characterized in that: The invention comprises a circulating water tank (5), wherein a fully-attached model (1) is fixed to a test section in the circulating water tank (5) via a first rapier (123) and a second rapier (124) arranged at intervals, a first light source (2) and a second light source (3) are symmetrically arranged outside the circulating water tank (5), the light source centers of the first light source (2) and the second light source (3) coincide with the busbar of a conduit (110) of the fully-attached model (1), and a CCD camera (4) is arranged at an upper position inside the circulating water tank (5); The structure of the full-body model (1) is as follows: a first segment (102), a second segment (104) and a third segment (106) are sequentially arranged from one end to the other end; a first angle control device (116) is installed on the third segment (106); a second angle control device (122) is fixed on the first segment (102); the second segment (104) is fixed between the third segment (106) and the first segment (102) through a first support ring (103) and a second support ring (105), respectively; and the second angle control device (122) is fixed on the first segment (102). ) is mounted on the shaft of the first angle control device (116), the rotation angle of the head structure (101) is controlled by a second angle control device (122), a tail structure (108) is mounted on the shaft of the first angle control device (116), the rotation angle of the tail structure (108) is controlled by the first angle control device (116), a third support ring (107) is fixed on the tail structure (108), and the enclosure appendage (121) is fixed to the head structure (101), the first support ring (103), the second support ring (105) and the third support ring (107) at the same time. The casing appendage (121) is mounted on the support ring (107) and rotates with the head structure (101). The guide tube (110) is fixed to the tail structure (108) through the stator (109). The guide tube (110) rotates with the tail structure (108). One end of the shaft sleeve (113) is fixed to the first angle control device (116), and the other end is supported on the tail structure (108). The two ends of the shaft sleeve (113) respectively support the first bearing (112) and the second bearing (115). The third bearing (118) is fixed to the shaft sleeve (113). In the encoder assembly (117), the propeller shaft (114) is supported on a first bearing (112), a second bearing (115) and a third bearing (118), and is connected to the output shaft of an underwater motor (120) through a first coupling (119). The underwater motor (120) is fixed on the mounting platform of the second section (104). The rotor (111) is sleeved on the propeller shaft (114). The shaft encoder assembly (117) is sleeved on the propeller shaft (114). The shaft encoder assembly (117) is used to provide a control signal to the PIV synchronization controller.

2. The omnidirectional flow field measurement system in a fully attached model catheter as claimed in claim 1, characterized in that: The third section (106) is fixed inside the circulating water tank (5) via a first rapier (123), and the first section (102) is fixed inside the circulating water tank (5) via a second rapier (124).

3. The omnidirectional flow field measurement system in a fully attached model catheter as claimed in claim 1, characterized in that: The CCD camera (4) does not come into contact with water and takes pictures from top to bottom.

4. The omnidirectional flow field measurement system in a fully attached model catheter as claimed in claim 1, characterized in that: The first support ring (103), the second support ring (105) and the third support ring (107) have the same structure.

5. The omnidirectional flow field measurement system in a fully attached model catheter as claimed in claim 1, characterized in that: The structure of the first support ring (103) is as follows: it comprises a moving ring (1031), a cover plate (1032), a stationary ring (1033), a bull's eye wheel (1034) and a screw roller (1035); 24 bull's eye wheels (1034) are evenly distributed and fixed on the stationary ring (1033) in the circumferential direction; the moving ring (1031) is sleeved on the balls of the bull's eye wheels (1034); when the moving ring (1031) rotates, the balls of the bull's eye wheels (1034) will follow the rolling to avoid jamming; the cover plate (1032) is fixed on both sides of the stationary ring (1033); twelve screw rollers (1035) are evenly distributed in the circumferential direction; the steel balls of the screw rollers (1035) are in contact with the moving ring (1031) to limit the axial position of the moving ring (1031).

6. The omnidirectional flow field measurement system in a fully attached model catheter as claimed in claim 1, characterized in that: The first angle control device (116) and the second angle control device (122) have the same structure.

7. The omnidirectional flow field measurement system in a fully attached model catheter as claimed in claim 1, characterized in that: The structure of the first angle control device (116) is as follows: it includes a rotating shaft (11601), a concentric tooling (11602), a bearing chamber (11603), a semicircular base (11604), a bottom plate (11605), an air disc brake (11606), a disc brake fixing frame (11607), an angle sensor (11608), a sensor fixing frame (11609), a second coupling (11610), a reduction motor (11611), a transition plate (11612) and a brake disc (11613), wherein the rotating shaft (11601) is supported in the bearing chamber (11603) through a bearing, the bearing chamber (11603) is embedded in the concentric tooling (11602), and the bottom plate (11605) is fixed on the bearing chamber (11603) through the semicircular base (11604); the brake disc (11613) and the rotating shaft (11601) are connected to each other. 601), the air disc brake (11606) is fixed on the base plate (11605) through the disc brake fixing frame (11607), when ventilated, the air disc brake (11606) holds the brake disc (11613) tightly, thereby locking the rotating shaft (11601) to prevent the rotating shaft (11601) from shaking during the test, the angle sensor (11608) is on the rotating shaft (11601), the static ring (1033) is fixed on the base plate (11605) through the sensor fixing frame (11609), the angle sensor (11608) is used to feedback the angle change of the rotating shaft (11601), the reduction motor (11611) is fixed on the base plate (11605) through the transition plate (11612), and the output shaft is connected to the rotating shaft (11601) through the second coupling (11610) to control the rotation of the rotating shaft (11601).

8. The omnidirectional flow field measurement system in a fully attached model catheter as claimed in claim 1, characterized in that: The structure of the shaft encoder assembly (117) is as follows: it comprises a large base (1171), a supporting spring sheet (1172) and an encoder (1173); the encoder (1173) is fixed on the large base (1171) via supporting spring sheets (1172) which are symmetrically arranged up and down.

9. The omnidirectional flow field measurement system in a fully attached model catheter as claimed in claim 8, characterized in that: A bearing mounting hole is provided in the large base (1171).

10. A method for measuring the omnidirectional flow field in a full-body model catheter as claimed in claim 1, characterized in that: The following operation procedures are included: The first step is to install the full-body model (1) at the 0° angle during initial installation; The second step is to start the underwater motor (120) to drive the rotor (111) to rotate; The third step is to measure the two-dimensional flow field information on the plane coinciding with the axis in the conduit (110) under different phase states of the rotor (111) using the PIV phase-locked measurement technology according to the phase information of the shaft encoder; Step 4: turning off the underwater motor (120) and stopping the rotor (111) from rotating; Step 5: Rotate the conduit (110) in the direction of 0°-90°-180°, and repeat the third and fourth steps to obtain two-dimensional flow field information on a plane coinciding with the axis in the conduit (110) when the rotor (111) is in different phase states in all regions A, B, C, and D; In the sixth step, through post-data processing, the omnidirectional flow field information in the plane perpendicular to the propeller axis between the rotor (111) and the stator (109) in the fully attached duct can be obtained.

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