CN114018540B - Dynamic boundary tip vortex cavitation experimental device - Google Patents
Dynamic boundary tip vortex cavitation experimental device Download PDFInfo
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- CN114018540B CN114018540B CN202111130328.1A CN202111130328A CN114018540B CN 114018540 B CN114018540 B CN 114018540B CN 202111130328 A CN202111130328 A CN 202111130328A CN 114018540 B CN114018540 B CN 114018540B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
The invention discloses a movable boundary tip vortex cavitation experimental device, and belongs to the technical field of hydrodynamic test measurement. The hydraulic test device comprises a water tunnel test section, an objective table, a servo motor, a rotary transformer, a turbine screw mechanism, a six-axis force sensor, a shell, a test model, an end cover, a bearing, a rotating shaft, an O-shaped sealing ring A, O type sealing ring B and the like. The precise continuous movement of the blade tip model is realized by adopting a servo motor, a turbine screw mechanism, a rotary transformer and other mechanisms; the double connection mode of the positioning boss and the connecting screw is set, so that the stability of the movement of the blade tip model and the accuracy of an experiment are ensured; the device can flexibly and conveniently replace the test model, is suitable for the cavitation research of movable boundary tip vortex of different shapes and material models, and has good practicability and application prospect.
Description
Technical Field
The invention relates to the technical field of hydrodynamic test measurement, in particular to a movable boundary tip vortex cavitation experimental device.
Background
Cavitation refers to a phase change phenomenon that occurs in a liquid medium under certain conditions. Tip vortex cavitation is an important form of cavitation flow, and in a flow field with strong shear to form a vortex, the pressure in the core area of the vortex is very low, so that vortex cavitation phenomenon is generated. In an axial flow pump, a blade top (rim) gap inevitably exists between a rim and a runner chamber, and cavitation structures induced by vortex of the blade top gap can have great influence on a main flow field structure, so that the hydraulic performance of the axial flow pump can be obviously reduced; when the situation is serious, the cavitation vortex belt can induce the unit to generate abnormal vibration and noise, and seriously threaten the long-term safe and stable operation of the axial flow pump unit. In the propeller, tip vortex cavitation of the blade tip not only reduces the performance of the unit, but also more importantly, the cavitation vortex belt induces the unit to generate vibration and fluid noise, so that the concealment and reliability of ships such as amphibious vehicles, submarines and stealth guardships are greatly reduced.
In conclusion, the grasping and knowing of the cavitation flow characteristics of the tip vortex of the movable boundary has important significance for the design and safe and efficient operation of the hydraulic mechanical system. However, the current cavitation flow test device for the movable boundary tip is relatively few. The invention patent CN201710054658.4 discloses a variable attack angle hydrofoil cavitation water tunnel test system, which is characterized in that: the system consists of a water tunnel observation section, a fastening plate, a fastening bolt, a positioning plate, a positioning bolt, a threaded hole matched with the positioning bolt, an attack angle regulator, a limiter, a hydrofoil connecting shaft, a hydrofoil and a sealing ring. Although the hydrofoil attack angle can be adjusted, continuous movement of the hydrofoil cannot be performed, and experimental research of movable boundary tip vortex cavitation cannot be performed.
Therefore, in view of the above problems, a device for performing the cavitation test of the movable boundary tip is needed.
Disclosure of Invention
In view of the above, the invention provides a movable boundary tip vortex cavitation experimental device which can realize continuous movement of an experimental model and can develop experimental research of movable boundary tip vortex cavitation.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the utility model provides a movable boundary tip vortex cavitation experimental apparatus, includes water tunnel experimental section, objective table, servo motor, motor shaft coupling A, rotary transformer, turbine screw rod mechanism, sensor shaft coupling A, six axle force sensors, sensor shaft coupling B, shell, test model, shell fixing bolt, rotary transformer flange, end cover), bearing, pivot, O type sealing washer A, O formula sealing washer B, connecting screw, fixation nut, motor shaft coupling B and O type sealing washer C.
An objective table is arranged at the rear side of the water tunnel experimental section, a servo motor is mounted on the objective table, an output shaft of the servo motor is connected with a turbine screw mechanism through a motor coupler A and a motor coupler B, a rotary transformer is mounted at one side of the turbine screw mechanism away from the water tunnel experimental section, and a rotary transformer connecting flange and a fixing nut are arranged between the rotary transformer and the turbine screw mechanism; one side of the turbine screw mechanism, which is close to the water tunnel experimental section, is provided with a six-axis force sensor through a sensor coupler A, and the other side of the six-axis force sensor is connected with a rotating shaft through a sensor coupler B.
The outer part of the rotating shaft is provided with a shell, the shell is arranged on the water tunnel experimental section through a shell fixing bolt, a bearing matched with the rotating shaft is arranged inside the shell, one side of the shell, which is close to the turbine screw mechanism, is provided with an end cover through a screw, and the other side of the rotating shaft is provided with a test model through a connecting screw.
An O-shaped sealing ring A is installed on one side, close to the test model, of the rotating shaft in the circumferential direction, an O-shaped sealing ring B is installed on one side, close to the rotating shaft, of the test model in the circumferential direction, and an O-shaped sealing ring C is installed between the shell and the water hole test section.
Further, one end that test model and pivot are connected is equipped with the location boss, is equipped with the constant head tank who installs with the cooperation of location boss in the pivot, and test model circumferencial direction is equipped with O type sealing washer groove B with O type sealing washer B cooperation installation, is equipped with the through-hole of connecting screw cooperation installation on the test model, and the number of connecting screw is 6, evenly arranges in the circumferencial direction, is equipped with the blade tip model on the test model.
Further, a bearing positioning step matched with the bearing is arranged on the rotating shaft, O-shaped sealing ring grooves A matched with the O-shaped sealing rings A are arranged on the outer circle of the rotating shaft (16), the number of the O-shaped sealing rings A is 2, and one end, close to the test model, of the rotating shaft is provided with a positioning threaded hole connected with a connecting screw.
Further, a groove matched with the O-shaped sealing ring C is formed in the outer circle of one side of the shell, which is close to the water hole experimental section; transparent PVC board is installed to water hole experimental section front side, and water hole experimental section rear side is equipped with the screw hole of being connected with shell fixing bolt cooperation.
Further, the working method of the device comprises the following steps:
firstly, setting motion parameters of a test model through a computer, sending a command to a servo motor controller, then driving a turbine screw mechanism to move by a servo motor, monitoring the motion angle in real time through a rotary transformer, and carrying out feedback and closed-loop control; the turbine screw mechanism drives the rotating shaft to rotate, so that the movement of the blade tip model is realized;
in addition, the dynamic characteristic information can be measured and captured through the six-axis force sensor;
inside the experimental section of the water tunnel, different cavitation flow field parameters are realized by adjusting internal pressure, and meanwhile, the dynamic boundary blade tip cavitation flow experimental measurement research is realized by changing experimental models of different materials, shapes, distances and the like.
The beneficial effects are that:
1. the movable boundary tip vortex cavitation experimental device disclosed by the invention realizes continuous movement of the blade tip model by adopting a servo motor, a turbine screw mechanism and other mechanisms, and simultaneously, the accuracy of a movement track is ensured by arranging a rotary transformer to monitor angles.
2. According to the movable boundary tip vortex cavitation experimental device disclosed by the invention, the stability of the movement of the blade tip model is ensured by arranging the double connection mode of the positioning boss and the connecting screw, so that the accuracy of the experiment is ensured.
3. According to the movable boundary tip vortex cavitation experimental device disclosed by the invention, by arranging the plurality of O-shaped sealing rings, the problem of water leakage caused by pressure change of a water tunnel experimental section is avoided, and the safety of the device and the experiment is ensured.
4. The movable boundary tip vortex cavitation experimental device disclosed by the invention can flexibly and conveniently replace the experimental model, is suitable for the movable boundary tip vortex cavitation research of different shapes and material models, and greatly improves the practicability of the device.
5. The movable boundary tip vortex cavitation experimental device disclosed by the invention can obtain relevant hydrodynamic information parameters through the six-axis force sensor, can guide flow analysis and structural design in the hydrodynamic field, and solves the technical problems of relevant engineering in the hydrodynamic field.
6. According to the movable boundary tip vortex cavitation experimental device disclosed by the invention, the influence of ventilation/jet flow on movable boundary tip vortex cavitation can be developed by replacing the experimental model and the rotating shaft, so that a reference basis is provided for optimally controlling tip vortex cavitation.
Drawings
FIG. 1 is a three-dimensional view of a movable boundary tip vortex cavitation experimental apparatus disclosed by the invention;
FIG. 2 is a top view of the movable boundary tip vortex cavitation experimental apparatus of the present disclosure;
FIG. 3 is a cross-sectional view of the movable boundary tip vortex cavitation experimental apparatus of the present disclosure;
FIG. 4 is a front view of the movable boundary tip vortex cavitation experimental apparatus of the present disclosure;
FIG. 5 is a side view of the movable boundary tip cavitation experimental apparatus of the present disclosure;
FIG. 6 is a three-dimensional view of a test model of the movable boundary tip vortex cavitation test device disclosed by the invention;
FIG. 7 is a three-dimensional view of the shaft of the movable boundary tip vortex cavitation experimental apparatus disclosed by the invention;
FIG. 8 is a front view of the spindle of the movable boundary tip cavitation experimental apparatus of the present disclosure;
FIG. 9 is a side view of the shaft of the movable boundary tip cavitation experimental apparatus of the present disclosure;
the device comprises a 1-water hole experimental section, a 2-objective table, a 3-servo motor, a 4-motor coupler A, a 5-rotary transformer, a 6-turbine screw mechanism, a 7-sensor coupler A, an 8-six-axis force sensor, a 9-sensor coupler B, a 10-shell, an 11-experimental model, a 12-shell fixing bolt, a 13-rotary transformer connecting flange, a 14-end cover, a 15-bearing, a 16-rotating shaft, a 17-O-shaped sealing ring A, a 18-O-shaped sealing ring B, a 19-connecting screw, a 20-fixing nut, a 21-motor coupler B, a 22-O-shaped sealing ring C, an 11-1-positioning boss, an 11-2-through hole, an 11-3-O-shaped sealing ring groove B, an 11-4-blade tip model, a 16-1-positioning groove, a 16-2 positioning threaded hole, a 16-3-O-shaped sealing ring groove A and a 16-4-bearing positioning step.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
As shown in fig. 1, 2, 3, 4 and 5, the movable boundary tip vortex cavitation experimental device disclosed by the invention comprises a water tunnel experimental section 1, an objective table 2, a servo motor 3, a motor coupler A4, a rotary transformer 5, a turbine screw mechanism 6, a sensor coupler A7, a six-axis force sensor 8, a sensor coupler B9, a shell 10, a test model 11, a shell fixing bolt 12, a rotary transformer connecting flange 13, an end cover 14, a bearing 15, a rotating shaft 16, an O-shaped sealing ring a17, an O-shaped sealing ring B18, a connecting screw 19, a fixing nut 20, a motor coupler B21 and an O-shaped sealing ring C22. The rear side of the water tunnel experiment section 1 is provided with an objective table 2, the objective table 2 is provided with a servo motor 3, an output shaft of the servo motor 3 is connected with a turbine screw mechanism 6 through a motor coupler A4 and a motor coupler B21, one side of the turbine screw mechanism 6 away from the water tunnel experiment section 1 is provided with a rotary transformer 5, and a rotary transformer connecting flange 13 and a fixing nut 20 are arranged between the rotary transformer 5 and the turbine screw mechanism 6; one side of the turbine screw mechanism 6, which is close to the water tunnel experiment section 1, is provided with a six-axis force sensor 8 through a sensor coupler A7, and the other side of the six-axis force sensor 8 is connected with a rotating shaft 16 through a sensor coupler B9. The shell 10 is arranged outside the rotating shaft 16, the shell 10 is arranged on the water tunnel experiment section 1 through the shell fixing bolt 12, the bearing 15 which is matched with the rotating shaft 16 is arranged inside the shell 10, the end cover 14 is arranged on one side, close to the turbine screw mechanism 6, of the shell 10 through a screw, and the test model 11 is arranged on the other side of the rotating shaft 16 through the connecting screw 19. An O-shaped sealing ring A17 is arranged on one side of the rotating shaft 16, which is close to the test model 11, an O-shaped sealing ring B18 is arranged on one side of the test model 11, which is close to the rotating shaft 16, in the circumferential direction, and an O-shaped sealing ring C22 is arranged between the shell 10 and the water tunnel experimental section 1. The outer circle of the shell 10 at one side close to the water hole experiment section 1 is provided with a groove matched with the O-shaped sealing ring C22. The transparent PVC board is installed to the water tunnel experiment section 1 front side, and the water tunnel experiment section 1 rear side is equipped with the screw hole of being connected with shell fixing bolt 12 cooperation. Tip vortex cavitation typical model structure of test model
As shown in fig. 6, a positioning boss 11-1 is arranged at one end of the test model 11 connected with the rotating shaft 16, a positioning groove 16-1 matched with the positioning boss 11-1 is arranged on the rotating shaft 16, an O-shaped sealing ring groove B11-3 matched with an O-shaped sealing ring B18 is arranged in the circumferential direction of the test model 11, through holes 11-2 matched with connecting screws 19 are arranged on the test model 11, the number of the connecting screws 19 is 6, the connecting screws are uniformly distributed in the circumferential direction, and a blade tip model 11-4 is arranged on the test model 11.
As shown in fig. 7, 8 and 9, a bearing positioning step 16-4 matched with a bearing 15 is arranged on a rotating shaft 16, O-shaped seal ring grooves A16-3 matched with O-shaped seal rings A17 are arranged on the outer circle of the rotating shaft 16, the number of the O-shaped seal rings A17 is 2, and a positioning threaded hole 16-2 connected with a connecting screw 19 is arranged at one end of the rotating shaft 16 close to a test model 11.
As shown in FIG. 1, the movable boundary tip vortex cavitation experimental device disclosed by the invention has the working method that: firstly, setting motion parameters of a test model through a computer, sending a command to a servo motor controller, then driving a turbine screw mechanism 6 to move by a servo motor 3, monitoring the motion angle in real time through a rotary transformer 5, and carrying out feedback and closed-loop control; the turbine screw mechanism 6 drives the rotating shaft 16 to rotate, so that the blade tip model 11-4 moves. In addition, the dynamic characteristic information can be measured and captured by the six-axis force sensor 8. Inside the water tunnel experiment section 1, different cavitation flow field parameters are realized by adjusting internal pressure, and meanwhile, dynamic boundary blade tip cavitation flow experiment measurement research is realized by changing experiment models 11 of different materials, shapes, distances and the like. Based on the experimental device, the dynamic boundary tip vortex cavitation flow field and dynamic characteristic information can be obtained, and the optimal design of the engineering structure can be guided. In addition, the method can provide powerful support for the application of aspects such as health monitoring, structural fault diagnosis, structural vibration control and the like under dynamic change, and has wide application prospect and benefit.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The movable boundary tip vortex cavitation experimental device is characterized in that: the hydraulic test device comprises a water tunnel test section (1), an objective table (2), a servo motor (3), a motor coupler A (4), a rotary transformer (5), a turbine screw mechanism (6), a sensor coupler A (7), a six-axis force sensor (8), a sensor coupler B (9), a shell (10), a test model (11), a shell fixing bolt (12), a rotary transformer connecting flange (13), an end cover (14), a bearing (15), a rotating shaft (16), an O-shaped sealing ring A (17), an O-shaped sealing ring B (18), a connecting screw (19), a fixing nut (20), a motor coupler B (21) and an O-shaped sealing ring C (22);
the utility model discloses a water tunnel experimental section, including water tunnel experimental section (1), including motor coupling A (4), motor coupling B (21), rotary transformer (5) and fixed nut (20), be equipped with on the water tunnel experimental section (1) rear side rotary transformer (5) is equipped with on objective table (2) servo motor (3), the output shaft of servo motor (3) pass through motor coupling A (4) motor coupling B (21) with turbine screw mechanism (6) link to each other, turbine screw mechanism (6) keep away from rotary transformer (5) with be equipped with rotary transformer flange (13) between turbine screw mechanism (6); the turbine screw mechanism (6) is provided with the six-axis force sensor (8) through the sensor coupler A (7) at one side close to the water tunnel experiment section (1), and the other side of the six-axis force sensor (8) is connected with the rotating shaft (16) through the sensor coupler B (9);
the shell (10) is arranged outside the rotating shaft (16), the shell (10) is arranged on the water hole experiment section (1) through a shell fixing bolt (12), a bearing (15) which is matched with the rotating shaft (16) is arranged inside the shell (10), an end cover is arranged on one side, close to the turbine screw mechanism (6), of the shell (10) through a screw, and the experiment model (11) is arranged on the other side of the rotating shaft (16) through a connecting screw;
an O-shaped sealing ring A (17) is arranged on one side, close to the test model (11), of the rotating shaft (16), an O-shaped sealing ring B (18) is arranged on one side, close to the rotating shaft (16), of the test model (11), and an O-shaped sealing ring C (22) is arranged between the shell (10) and the water tunnel test section (1).
2. The movable boundary tip vortex cavitation experimental device according to claim 1, wherein: the test model (11) with the one end that pivot (16) is connected is equipped with location boss (11-1), be equipped with on pivot (16) with location boss (11-1) cooperation installation's positioning groove (16-1), test model (11) circumferencial direction be equipped with O type sealing washer B (18) cooperation installation's O type sealing washer groove B (11-3), be equipped with on test model (11) connecting screw cooperation installation's through-hole (11-2), connecting screw's quantity is 6, evenly arranges in circumferencial direction, be equipped with blade tip model (11-4) on test model (11).
3. The movable boundary tip vortex cavitation experimental device according to claim 1, wherein: the device is characterized in that a bearing positioning step matched with the bearing (15) is arranged on the rotating shaft (16), O-shaped sealing ring grooves A matched with the O-shaped sealing rings A (17) are arranged on the outer circle of the rotating shaft (16), the number of the O-shaped sealing rings A (17) is 2, and one end, close to the test model, of the rotating shaft (16) is provided with a positioning threaded hole connected with the connecting screw.
4. The movable boundary tip vortex cavitation experimental device according to claim 1, wherein: the outer circle of one side of the shell, which is close to the water hole experiment section (1), is provided with a groove matched with the O-shaped sealing ring C (22); transparent PVC board is installed to water hole experiment section (1) front side, water hole experiment section (1) rear side be equipped with shell (10) fixing bolt cooperation is connected the screw hole.
5. The movable boundary tip vortex cavitation experimental device according to claim 1, wherein: the working method of the device comprises the following steps: firstly, setting motion parameters of a test model (11) through a computer, sending a command to a servo motor controller, then driving a turbine screw mechanism (6) to move by a servo motor (3), monitoring a motion angle in real time through a rotary transformer (5), and performing feedback and closed-loop control; the turbine screw mechanism (6) drives the rotating shaft (16) to rotate, so that the movement of the blade tip model (11-4) is realized;
in addition, the dynamic characteristic information can be measured and captured through the six-axis force sensor (8);
inside the water tunnel experiment section (1), different cavitation flow field parameters are realized by adjusting internal pressure, and meanwhile, the dynamic boundary blade tip cavitation flow experiment measurement research is realized by changing experiment models (11) with different materials, shapes or distances.
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| CN202111130328.1A CN114018540B (en) | 2021-09-26 | 2021-09-26 | Dynamic boundary tip vortex cavitation experimental device |
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| CN202111130328.1A CN114018540B (en) | 2021-09-26 | 2021-09-26 | Dynamic boundary tip vortex cavitation experimental device |
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| CN114018540B true CN114018540B (en) | 2023-10-03 |
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