A system and method for measuring omnidirectional flow field in a fully attached model catheter

Abstract

The present invention relates to a system and method for measuring the omnidirectional flow field within a fully-appended model conduit. The system comprises a rotatable fully-appended model, a first light source, a second light source, a CCD camera, and a circulating water tank. The fully-appended model is fixed within a test section of the circulating water tank via a first rapier and a second rapier. The first and second light sources are symmetrically arranged outside the circulating water tank, with the centers of the light sources coinciding with the conduit busbars of the rotatable fully-appended model. The CCD camera is arranged within the central compartment of the circulating water tank, capturing images from top to bottom. By rotating the fully-appended model, the system solves the problem of measuring the omnidirectional flow field within the conduit of the fully-appended model, between the rotor and stator, in a plane perpendicular to the propeller axis.

Description

Technical Field

[0001] The present 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 appended model catheter. Background Art

[0002] The flow field characteristics within a fully attached model duct are closely related to the low-frequency excitation force on the rotor within the duct, its induced noise, and the low-frequency broadband force and induced noise. To improve and verify the calculation methods for the low-frequency excitation force and low-frequency broadband force on the rotor within the duct, it is necessary to obtain unobstructed omnidirectional flow field information within the duct through experimental means. This means obtaining flow field information at different rotor rotational phase angles in a plane perpendicular to the propeller axis between the rotor and stator within 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 response to the above-mentioned deficiencies in the existing production technology, the applicant provides a system and method for measuring the omnidirectional flow field in a fully-attached model duct, which can effectively solve the problem of measuring the omnidirectional flow field in the plane perpendicular to the propeller axis between the rotor and the stator in the fully-attached model duct, and can conveniently complete the measurement work, with easy overall operation and good working reliability.

[0005] The technical solutions adopted in the present invention are as follows:

[0006] A system for measuring the omnidirectional flow field in a fully-attached model conduit comprises a circulating water tank, wherein a test section of the circulating water tank is fixed with the fully-attached model via 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 a busbar of the conduit of the fully-attached 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; 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, and 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, and the shaft encoder assembly is sleeved on the propeller shaft. The function of the shaft encoder assembly is to provide control signals to the PIV synchronization 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: it includes a dynamic ring, a cover plate, a static ring, a bull's eye wheel and a screw roller. The 24 bull's eye wheels are evenly distributed and fixed on the static ring. The dynamic ring is sleeved on the balls of the bull's eye wheel. When the dynamic ring rotates, the balls of the bull's eye wheel will roll along to avoid jamming. The cover plate is fixed on both sides of the static ring. Twelve screw rollers are evenly distributed around the circumference. The steel balls of the screw rollers are in contact with the dynamic ring to limit the axial position of the dynamic 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 base plate, an air disc brake, a disc brake fixing bracket, an angle sensor, a sensor fixing bracket, 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 in the concentric tooling, and the base 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 base plate through the disc brake fixing bracket. 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 base plate through the sensor fixing bracket. The angle sensor is used to feedback the angle change of the rotating shaft. The reduction motor is fixed to the base plate through the transition plate, and the output shaft and the rotating shaft are connected through the second coupling to control the rotation of the rotating shaft.

[0015] The structure of the shaft encoder assembly includes a large base, supporting springs and an encoder, wherein the encoder is fixed on the large base via supporting springs that are symmetrically arranged up and down.

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

[0017] A method for measuring the omnidirectional flow field in a fully attached model catheter according to claim 1, comprising the following operating procedures:

[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 at different rotor phase states based on the phase information of the shaft encoder.

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

[0022] Step 5: Rotate the pipe in the direction of 0°-90°-180° and repeat steps 3 and 4 to obtain the two-dimensional flow field information on the plane coinciding with the axis of the pipe in all regions A, B, C, and D under different rotor phase states.

[0023] In the sixth step, 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 fully attached duct can be obtained.

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

[0025] The present invention features a compact, rational, and easy-to-use structure. Through the design of a fully-attached model, PIV technology can be used to obtain two-dimensional flow field information on a plane coinciding with the propeller axis within the duct at a certain angle and at different propeller phases. By rotating the fully-attached model, two-dimensional flow field information on a plane coinciding with the propeller axis within the duct at different angles and at different propeller phases can be obtained. Subsequent data processing can also be used to obtain omnidirectional flow field information within the fully-attached duct, between the rotor and stator, in a plane perpendicular to the propeller axis.

[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 light source sheet and the camera shooting angle.

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

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

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

[0031] Figure 3 It is a structural schematic 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 structural schematic diagram of the shaft encoder assembly of the present invention.

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

[0035] Including: 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. Shell 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 mounting bracket; 11608, angle sensor; 11609, sensor mounting 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 embodiments of the present invention will be described below with reference to the accompanying drawings.

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

[0042] The system mainly comprises a rotatable fully attached model 1, a first light source 2, a second light source 3, a CCD camera 4 and a circulating water tank 5.

[0043] The fully-attached model 1 is secured within the test section of the circulating water tank 5 by means of a first rapier 123 and a second rapier 124. The first and second light sources 2 and 3 are symmetrically arranged outside the circulating water tank 5, with the center of the light sheet coinciding with the busbars of the duct of the rotatable fully-attached model 1 to prevent the light sheet from shifting due to the duct curvature. A CCD camera 4 is positioned within the central compartment of the circulating water tank 5, away from the water, and capable of capturing images from above. By strategically arranging the light sheet and camera angles, interference with the flow field measurement within the duct 110 by the rotor 111 is avoided.

[0044] When the fully-attached model 1 is fixed, PIV technology can be used to obtain two-dimensional flow field information within the duct on a plane coinciding with the propeller axis at a specific angle and at different propeller phases. By rotating the fully-attached model 1, two-dimensional flow field information within the duct on a plane coinciding with the propeller axis can be obtained at different angles and at different propeller phases. Through subsequent data processing, omnidirectional flow field information within the fully-attached duct, between the rotor 111 and stator 109, in a plane perpendicular to the propeller axis, 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 hull 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 to 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 to 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 fixed to the head 101, the rotating ring 1031 of the first support ring 103, the second support ring 105, and the third support ring 107, respectively. It rotates with the head structure 101, while preventing heave caused by the long length of the enclosure appendage 121. The catheter 110 is fixed to the tail 108 via the stator 109 and rotates with it. By controlling the head 101 and the tail structure 108 to rotate at the same angle, the circumferential angle of the PIV measurement plane within the full-appendage model catheter can be varied. One end of the sleeve 113 is fixed to 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 to the ends of the sleeve 113, and the third bearing 118 is fixed to the large base 1171 of the shaft encoder assembly 117. The propeller shaft 114 is supported by a first bearing 112, a second bearing 115, and a third bearing 118. It is connected to the output shaft of the underwater motor 120 via a first coupling 119. The underwater motor 120 is secured to the mounting platform of the second segment 104. The rotor 111 is mounted on the propeller shaft 114. The shaft encoder assembly 117 is mounted on the propeller shaft 114 and secured to the third segment 106 via a large base 1171. The shaft encoder assembly 117 provides control signals to the PIV synchronization controller.

[0047] like Figure 3 As shown, the first support ring 103 includes a rotating ring 1031, a cover plate 1032, a stationary ring 1033, a bull's eye wheel 1034, and a screw roller 1035. Twenty-four bull's eye wheels 1034 are evenly distributed circumferentially and fixed to the stationary ring 1033. The rotating ring 1031 is sleeved on the balls of the bull's eye wheel 1034. When the rotating ring 1031 rotates, the balls 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 circumferentially. The steel balls of the screw rollers 1035 contact the rotating ring 1031 to limit the axial position of the rotating 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 base plate 11605, an air disc brake 11606, a disc brake mounting bracket 11607, an angle sensor 11608, a sensor mounting bracket 11609, a second coupling 11610, a reduction motor 11611, a transition plate 11612, and a brake disc 11613. The rotating shaft 11601 is supported by bearings within the bearing chamber 11603 and is freely rotatable. The bearing chamber 11603 is embedded in the concentric tooling 11602. The base plate 11605 is fixed to the bearing chamber 11603 via the semicircular base 11604. The brake disc 11613 is fixed to the rotating shaft 11601. The air disc brake 11606 is secured to the base plate 11605 via the disc brake mount 11607. When ventilated, the air disc brake 11606 grips the brake disc 11613, thereby locking the rotating shaft 11601 and preventing vibration during testing. Angle sensor 11608 is located on the rotating shaft 11601, and the stationary ring 1033 is secured to the base plate 11605 via the sensor mount 11609. Angle sensor 11608 provides feedback on the angular changes of the rotating shaft 11601. The reduction motor 11611 is secured to the base plate 11605 via the transition plate 11612. Its output shaft is connected to the rotating shaft 11601 via the second coupling 11610, controlling the rotation of the rotating shaft 11601.

[0049] like Figure 5 As shown, shaft encoder assembly 117 includes a large base 1171, support springs 1172, and encoder 1173. Encoder 1173 is fixed to the base via support springs 1172 arranged symmetrically above and below. Bearing mounting holes are provided within large base 1171 to reduce the impact of vibration during propeller shaft 114 rotation on the phase signal of encoder 1173.

[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 the rotor 111 in the 0°-90°-180° direction as shown, and repeating steps 3 and 4, two-dimensional flow field information can be obtained for the plane coinciding with the axis of the ducts in all regions A, B, C, and D at different phases of the rotor 111. For example, when rotating from 0° to 90°, regions A and D are imaged, while when rotating from 90° to 180°, regions B and C are imaged.

[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 modifications 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 by: The invention comprises a circulating water tank (5), wherein a fully attached model (1) is fixed to a test section of 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 fully attached 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; 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 the second angle control device (122), the 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). On the support ring (107), the shell appendage (121) rotates together with the head structure (101), the guide tube (110) is fixed to the tail structure (108) through the stator (109), and the guide tube (110) rotates together 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), and the two ends of the shaft sleeve (113) respectively support the first bearing (112) and the second bearing (115), and the third bearing (118) is fixed to the shaft In the 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). 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 according to claim 1, characterized in that: The third segment (106) is fixed inside the circulating water tank (5) via a first rapier (123), and the first segment (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 according to 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 according to 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 according to claim 1, characterized in that: The structure of the first support ring (103) is as follows: it includes a moving ring (1031), a cover plate (1032), a stationary ring (1033), a bull's eye wheel (1034) and a screw roller (1035). The 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 and roll 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 according to 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 according to claim 1, characterized in that: The structure of the first angle control device (116) is as follows: comprising a rotating shaft (11601), a concentric tool (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 tool (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 to 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 to 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 to the base plate (11605) through the transition plate (11612). 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 according to 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 (1172) and an encoder (1173); the encoder (1173) is fixed on the large base (1171) via the supporting springs (1172) arranged symmetrically up and down.

9. The omnidirectional flow field measurement system in a fully attached model catheter according to 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 fully attached model catheter according to claim 1, characterized in that: The following operating 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; In the third step, based on the phase information of the shaft encoder, the PIV phase-locked measurement technology is used to measure and obtain two-dimensional flow field information on a plane coinciding with the axis in the conduit (110) under different phase states of the rotor (111); The fourth step is to turn off the underwater motor (120) and stop the rotor (111) from rotating. In the fifth step, the conduit (110) is rotated in the direction of 0°-90°-180°, and the third and fourth steps are repeated to obtain two-dimensional flow field information on a plane coinciding with the axis of the conduit (110) in all regions A, B, C, and D when the rotor (111) is in different phase states. In the sixth step, through post-processing of the data, 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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