Cavitation load measuring device, cavitation load measuring method and storage medium

Abstract

The invention provides a cavitation load measuring device, a cavitation load measuring method and a storage medium, and relates to the field of cavitation load measurement. The container is used for containing liquid; a cavitation load generation unit; the cavitation load generation unit comprises a vibration piece; the vibrating piece is arranged in the liquid contained in the container and used for triggering the liquid to generate cavitation load; a rotating unit; the rotating unit is arranged in the container, the rotating unit and the vibrating piece are arranged at intervals, the rotating unit comprises a rotating piece and a supporting frame used for supporting the rotating piece, the supporting frame and the container are fixedly arranged, and the axis of the rotating piece is perpendicular to the axis of the cavitation load generating unit; the rotating part rotates under the action of the cavitation load, a tracing point is marked on the rotating part, and the material of the rotating part is determined based on the material of the tested hydraulic machinery; and the image acquisition equipment is used for acquiring an image of the container, and the image is used for determining the maximum bearable cavitation load of the tested hydraulic machinery. According to the invention, the measurement precision of the cavitation load can be improved.

Description

Technical Field

[0001] The invention relates to the field of cavitation load measurement, and in particular to a cavitation load measurement device, a measurement method and a storage medium. Background Art

[0002] At present, cavitation problems are widely found in hydraulic machinery. Cavitation refers to the process in which the inherent small gas nuclei or dissolved gases in the liquid rapidly expand and gather into small bubbles when the pressure in the liquid drops to a low enough level. When the small bubbles caused by cavitation, namely cavitation bubbles, enter the high-pressure area, the cavitation bubbles may collapse in the high-pressure area due to the sharp increase in pressure, thereby generating a strong impact load. When the impact load generated is greater than the cohesive force on the surface of the material, it will cause damage to the surface of the material and form cavitation. Cavitation affects the efficiency and service life of hydraulic machinery, resulting in reduced operating performance of hydraulic machinery. Therefore, it is necessary to measure the maximum cavitation load that hydraulic machinery can withstand to ensure that the structure of the hydraulic machinery can withstand the expected load without failure.

[0003] In the prior art, the measurement of cavitation load mainly has the following problems:

[0004] 1) The size of cavitation bubbles is generally a few microns to more than ten microns. Due to the limitation of sensor manufacturing process, the current sensor size cannot reach the size of cavitation bubbles, resulting in large errors in the measured cavitation load. Therefore, it is very difficult to experimentally measure the cavitation load that causes cavitation erosion.

[0005] 2) The researchers estimated the cavitation load by measuring the size of the material pits caused by the cavitation load and combining it with the stress-strain relationship obtained from the nanoindentation experiment. However, due to the irregular size of the pits, they assumed that they were regular in shape during the estimation, which resulted in a certain error in the calculation results, causing the estimated load to be smaller than the actual cavitation load value. Summary of the invention

[0006] The purpose of the embodiments of the present application is to provide a cavitation load measurement device, a measurement method and a storage medium, which can more accurately measure the maximum cavitation load that a hydraulic machine can withstand.

[0007] In a first aspect, an embodiment of the present application provides a cavitation load measurement device, the measurement device comprising:

[0008] Containers for holding liquids;

[0009] A cavitation load generating unit; the cavitation load generating unit includes a vibrating member; the vibrating member is disposed in the liquid contained in the container, and the cavitation load generating unit is used to trigger the liquid to generate a cavitation load;

[0010] Rotating unit; the rotating unit is arranged in the container and spaced apart from the vibrating member, the rotating unit comprises a rotating member and a support frame for supporting the rotating member, the support frame is fixedly arranged with the container, the axis of the rotating member is perpendicular to the axis of the cavitation load generating unit; the rotating member rotates under the action of the cavitation load, a tracing point is marked on the rotating member, and the material of the rotating member is consistent with the material of the hydraulic machinery to be measured;

[0011] The image acquisition device is used to acquire multiple images of a container, wherein the multiple images include images of rotating parts or images of cavitation bubbles in the container; the maximum tolerable cavitation load of the rotating parts can be determined based on the multiple images, thereby determining the maximum tolerable cavitation load of the hydraulic machinery under test.

[0012] In some embodiments, the rotating member includes a rotating body and a tracer sheet sleeved on the rotating body, the tracer point is marked on the tracer sheet, and the material of the rotating body is the same as that of the hydraulic machinery to be measured.

[0013] In some embodiments, the rotating member and the vibrating member are staggered in the horizontal direction.

[0014] In some embodiments, the cavitation load generating unit further comprises:

[0015] An ultrasonic generator is arranged above the container and located on a side of the vibrating member away from the rotating member, and is used to generate ultrasonic waves;

[0016] The amplifier has two ends respectively connected to the ultrasonic generator and the vibrating element for amplifying the ultrasonic wave.

[0017] In some embodiments, the image acquisition device comprises:

[0018] A first image acquisition device is arranged opposite to a side of the rotating member marked with a tracing point, and is used to acquire an image of the tracing point;

[0019] The second image acquisition device is used to acquire images of cavitation bubbles in the container.

[0020] In a second aspect, an embodiment of the present application provides a method for measuring cavitation load, which is applied to the device for measuring cavitation load provided in the first aspect. The method comprises:

[0021] starting a cavitation load measuring device to generate a cavitation load, and acquiring a plurality of images by an image acquisition device;

[0022] determining the rotational acceleration of the rotating member according to a plurality of images acquired by the image acquisition device and the acquisition time of the plurality of images;

[0023] Determine the moment of inertia of the rotating part based on the size and mass of the rotating part;

[0024] The cavitation load moment is determined according to the horizontal distance between the axis of the vibrating member and the axis of the rotating member, as well as the size of the rotating member and the size of the vibrating member;

[0025] The maximum tolerable cavitation load of the tested hydraulic machinery is determined based on the moment of inertia, the cavitation load torque and the rotational acceleration.

[0026] In some embodiments, after determining the maximum tolerable cavitation load of the measured hydraulic machinery according to the moment of inertia, the cavitation load torque, and the rotational acceleration, the measurement method further includes:

[0027] Determine the force area of ​​the cavitation load according to the horizontal distance between the axis of the vibrating part and the axis of the rotating part;

[0028] The cavitation stress value is determined based on the maximum cavitation load that can be sustained by the bubble group and the force-bearing area of ​​the cavitation load;

[0029] The area of ​​a single cavitation bubble was determined from the images;

[0030] The maximum cavitation load that the tested hydraulic machinery can withstand for a single cavitation bubble is determined according to the cavitation stress value and the area of ​​the single cavitation bubble.

[0031] In some embodiments, the cavitation load moment is determined according to the horizontal distance between the axis of the vibrating member and the axis of the rotating member, and the size of the rotating member and the size of the vibrating member, including:

[0032] The cavitation load moment is determined according to the first formula, which is:

[0033]

[0034] Wherein, M is the cavitation load moment, r is the size of the rotating part, R is the size of the vibrating part, and d is the horizontal distance between the axis of the vibrating part and the axis of the rotating part.

[0035] In some embodiments, determining the maximum tolerable cavitation load of the tested hydraulic machinery based on the moment of inertia, the cavitation load torque, and the rotational acceleration includes:

[0036] The maximum tolerable cavitation load of the cavitation bubble group is determined according to the second formula, which is:

[0037] Jα=FM

[0038] Among them, J is the moment of inertia, α is the rotational acceleration, F is the cavitation load of the bubble group, and M is the cavitation load torque.

[0039] In a third aspect, an embodiment of the present application provides a computer-readable storage medium having computer program instructions stored thereon, and when the computer program instructions are executed by a processor, the method for measuring cavitation load as provided in the second aspect is implemented.

[0040] In an embodiment of the present application, a cavitation load measurement device is provided, comprising a container for holding liquid; a cavitation load generating unit; the cavitation load generating unit comprises a vibrator; the vibrator is arranged in the liquid held in the container, and is used to trigger the liquid to generate a cavitation load; a rotating unit; the rotating unit is arranged in the container, and is spaced apart from the vibrator, and comprises a rotating member and a support frame for supporting the rotating member, the support frame is fixedly arranged with the container, and the axis of the rotating member is perpendicular to the axis of the cavitation load generating unit; the rotating member rotates under the action of the cavitation load, and a tracer point is marked on the rotating member, and the material of the rotating member is determined based on the material of the hydraulic machinery to be measured; an image acquisition device is used to acquire images of the container, and multiple images include images of the rotating member or images of cavitation bubbles in the container; the maximum tolerable cavitation load of the rotating member can be determined according to the multiple images, thereby determining the maximum tolerable cavitation load of the hydraulic machinery to be measured. Through the above device, the cavitation load can be measured according to the images acquired when the rotating member rotates, so that the measurement of the cavitation load does not depend on the load sensor and the measurement of the material pit size, thereby improving the measurement accuracy of the maximum cavitation load that the hydraulic machinery can withstand. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of a cavitation load measurement device provided in an embodiment of the present application;

[0042] FIG2( a ) is a partial left side schematic diagram of a cavitation load measurement device provided in an embodiment of the present application;

[0043] FIG2( b ) is a partial top view of a cavitation load measurement device provided in an embodiment of the present application;

[0044] Figure 3 It is a schematic flow chart of a method for measuring cavitation load provided in an embodiment of the present application;

[0045] Figure 4 It is a top view schematic diagram of a cavitation load measurement device provided in a specific embodiment of the present application.

[0046] Among them, 100 is a container; 200 is a cavitation load generating unit; 210 is a vibrating member; 220 is an ultrasonic generator; 230 is an amplifier; 300 is a rotating unit; 310 is a rotating member; 311 is a rotating body; 312 is a tracer sheet; and 320 is a supporting frame. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0048] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0049] The nuclear reactor core control method and device, and electronic device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0050] See also Figure 1 , is a schematic diagram of the structure of a cavitation load measurement device provided in an embodiment of the present application. Figure 1 As shown, the cavitation load measurement device of the embodiment of the present application may include a container 100 for holding liquid, a cavitation load generating unit 200, a rotating unit 300 and an image acquisition device (not shown in the figure).

[0051] Specifically, in some embodiments, the container 100 for holding liquid is a container with corrosion resistance, pressure resistance and stability. The liquid is selected according to the application environment of the hydraulic machinery to be tested. In one example, the container is made of glass and the liquid is water.

[0052] The cavitation load generating unit 200 includes a vibrating member 210 ; the vibrating member 210 is disposed in the liquid contained in the container 100 to trigger the liquid to generate cavitation load.

[0053] In some embodiments, the cavitation load generating unit 200 is a part of the measuring device for generating cavitation loads. The cavitation load generating unit 200 mainly includes a vibrating member 210, which can be a solid cylinder, the bottom of which is immersed in the liquid contained in the container, so that the liquid generates cavitation loads when cavitation occurs.

[0054] The rotating unit 300 is arranged in the container, spaced apart from the vibrating member 210, and includes a rotating member 310 and a support frame 320 for supporting the rotating member 310. The support frame 320 is fixed to the container 100, and the axis of the rotating member 310 is perpendicular to the axis of the cavitation load generating unit 200; the rotating member 310 rotates under the action of the cavitation load, and the rotating member 310 is marked with tracing points. The material of the rotating member 310 is determined based on the material of the hydraulic machinery to be tested.

[0055] In some embodiments, the rotating unit 300 is disposed in the container and below the cavitation load generating unit 200, and is spaced apart from the vibrating member 210 of the cavitation load generating unit 200, that is, not on the same plane. The rotating unit 300 includes a rotating member 310 and a support frame 320 for supporting the rotating member. The rotating member 310 is a solid cylinder, and the support frame 320 is fixed inside the container 100 to support the rotating member 310. In one example, the rotating member 310 is disposed 0.5 mm below the vibrating member 210, and both ends are mounted on the support frame 320 by studs and nuts, and are immersed in the liquid contained in the container 100.

[0056] The rotating member 310 is marked with a tracer point. When cavitation occurs at the bottom of the vibrating member 210, the liquid in the container 100 generates a cavitation load, which causes the rotating member 310 to rotate around the axis. Since the measurement purpose of the embodiment of the present application is to measure the maximum cavitation load that the hydraulic machinery can withstand, the material of the rotating member 310 is determined based on the material of the hydraulic machinery to be measured to simulate the state of the hydraulic machinery when it is working. For example, if the hydraulic machinery to be measured is a blade-type hydraulic machinery, and the material of its turbine blades is a cast nickel-based alloy, then the material of the rotating member 310 is also a cast nickel-based alloy.

[0057] An image acquisition device (not shown in the figure) is used to acquire multiple images of the container 100, wherein the multiple images include an image of the rotating part 310 or an image of cavitation bubbles generated in the container 100; the maximum tolerable cavitation load of the rotating part can be determined based on the multiple images, thereby determining the maximum tolerable cavitation load of the hydraulic machinery under test.

[0058] In some embodiments, the image acquisition device is used to acquire images of the container 100 during the measurement process. The images include images of cavitation generated in the water tank 100 and images of tracking points on the rotating member 310. In one example, the image acquisition device is a high-speed camera, so that the tracking points can be captured more accurately and the cavitation images can be captured more clearly.

[0059] The rotation angles of the rotating member 310 at different times can be obtained based on the collected multiple tracking point images, and the rotation acceleration of the rotating member 310 can be obtained after processing the data. The size of a single cavitation bubble generated by cavitation can be determined based on the collected cavitation bubble images. The actual cavitation load of this measurement process can be calculated based on the rotation acceleration of the rotating member 310 and the size of a single cavitation bubble.

[0060] The amplitude of the vibrating member 210 is gradually increased to increase the cavitation load generated each time, and multiple measurements are performed, and the state of the rotating member 310 is observed while the measurements are performed. If cavitation is observed in the rotating member 310 during the i-th measurement, the cavitation load obtained during the i-1-th measurement is taken as the maximum tolerable cavitation load of the hydraulic machinery under test.

[0061] Thus, a cavitation load measuring device is provided, comprising a container for holding liquid; a cavitation load generating unit; the cavitation load generating unit comprises a vibrating member; the vibrating member is arranged in the liquid held in the container, and is used to trigger the liquid to generate a cavitation load; a rotating unit; the rotating unit is arranged in the container, and is spaced apart from the vibrating member, and comprises a rotating member and a support frame for supporting the rotating member, the support frame is fixedly arranged with the container, and the axis of the rotating member is perpendicular to the axis of the cavitation load generating unit; the rotating member rotates under the action of the cavitation load, and a tracer point is marked on the rotating member, and the material of the rotating member is consistent with the material of the hydraulic machinery to be measured; an image acquisition device is used to acquire multiple images of the container, and the multiple images include images of the rotating member or images of cavitation bubbles in the container; the maximum tolerable cavitation load of the rotating member can be determined according to the multiple images, thereby determining the maximum tolerable cavitation load of the hydraulic machinery to be measured. Through the above device, the cavitation load can be measured according to the images acquired when the rotating member rotates, so that the measurement of the cavitation load does not depend on the load sensor and the measurement of the material pit size, thereby improving the measurement accuracy of the maximum cavitation load that the hydraulic machinery can bear.

[0062] In some embodiments, Figure 1 As shown, the cavitation load generating unit 200 may further include an ultrasonic generator 220 and an amplifier 230 .

[0063] Specifically, the ultrasonic generator 220 is disposed above the container 100 and located on a side of the vibrating member away from the rotating member, and the ultrasonic generator is used to generate ultrasonic waves.

[0064] Two ends of the amplifier 230 are respectively connected to the ultrasonic generator 220 and the vibrating element 210 for amplifying ultrasonic waves.

[0065] The top of the amplifier 230 is connected to the bottom of the ultrasonic generator 220, and the bottom of the amplifier 230 is connected to the top of the vibrating member 210. When measuring the cavitation load, the ultrasonic wave emitted by the ultrasonic generator 220 is amplified by the amplifier 230, and cavitation is generated at the bottom of the vibrating member 210, so that the liquid generates a cavitation load, and the cavitation load is applied to the rotating member 310 under the vibrating member 210, so that the rotating member 310 rotates around the axis.

[0066] It should be noted that the cavitation load generating unit 200 is not limited to an ultrasonic generating device, and may also be driven by other driving modes other than ultrasonic driving that can make the vibrating element 210 vibrate to generate cavitation, such as electric driving.

[0067] In some embodiments, Figure 1 As shown, the rotating member 310 includes a rotating body 311 and a tracer sheet 312 sleeved on the rotating body 311 , and the tracer point is marked on the tracer sheet 312 . The material of the rotating body 310 is the same as that of the hydraulic machine to be tested.

[0068] Specifically, the rotating member 310 can be composed of two parts, namely, a rotating body 311 and a tracer sheet 312. The rotating body 311 is a solid cylinder, and the tracer sheet 312 is a thin circular ring, and the inner ring radius of the circular ring is larger than the radius of the rotating body 311. The tracer sheet 312 is sleeved on the rotating body 311 and fixed by welding. The tracer point is marked on the tracer sheet 312, and the material of the rotating body 310 is the same as that of the hydraulic machinery to be tested. When the rotating body 311 rotates around the axis, the tracer sheet 312 also rotates with it, and the rotation speed is equal.

[0069] By marking the tracer point on the tracer sheet 312, the image acquisition device can more accurately record the position of the tracer point during the rotation process, thereby calculating the rotation acceleration of the rotating member 310. It should be noted that the tracer point can also be directly marked on the rotating body 311, that is, the rotating member 310 only includes the rotating body 311, and the tracer sheet 312 is not required.

[0070] Please refer to Figure 2(a) and Figure 2(b), Figure 2(a) is a partial left view schematic diagram of a cavitation load measurement device provided in an embodiment of the present application, and Figure 2(b) is a partial top view schematic diagram of a cavitation load measurement device provided in an embodiment of the present application. As shown in Figure 2(a) and Figure 2(b), in some embodiments, the rotating member 310 and the vibrating member 210 are staggered in the horizontal direction.

[0071] Specifically, the axis of the rotating unit 300 is horizontal, and the axis of the cavitation load generating unit 200 is vertical. The two are perpendicular, but not on the same plane. Therefore, there is a certain distance between the two in the horizontal direction. In Figure 2 (a) and Figure 2 (b), the axis of the rotating member 310 and the axis of the vibrating member 210 are offset in the horizontal direction by a distance d. When cavitation occurs at the bottom of the vibrating member 210, the liquid generates a cavitation load, and the cavitation load applies an eccentric load to the rotating member 310, thereby causing the rotating member 310 to rotate around the axis. In this way, by adjusting the offset distance d, the force area of ​​the cavitation load (the shaded part in Figure 2 (b)) can be accurately controlled to ensure the accuracy of the measurement results.

[0072] In some implementations, the image acquisition device may include a first image acquisition device and a second image acquisition device.

[0073] Specifically, the first image acquisition device is disposed opposite to a side of the rotating member 310 marked with the tracing point, and is used to acquire images of the tracing point on the rotating member 310 during the measurement process.

[0074] The first image acquisition device is a device for acquiring images of the tracking points. Figure 1 The image shown is a front view of the measuring device, and the first image acquisition device can be set on the left or right side of the measuring device to capture and record the position of the tracking point on the rotating member 310, so as to calculate the rotational acceleration of the rotating member 310.

[0075] The second image acquisition device is used to acquire images of cavitation bubbles in the container 100 .

[0076] The second image acquisition device is a device for acquiring images of cavitation bubbles in the container 100. Figure 1 The image shown is a front view of the measuring device, and the second image acquisition device can be arranged in front of the measuring device, so that a clearer image of the cavitation can be captured.

[0077] See also Figure 3 , is a flow chart of a method for measuring cavitation load provided in an embodiment of the present application. Figure 3 As shown, the method for measuring the cavitation load in the embodiment of the present application may include the following steps:

[0078] Step 301: starting a cavitation load measurement device to generate a cavitation load, and acquiring a plurality of images through an image acquisition device;

[0079] Step 302: determining the rotational acceleration of the rotating member according to a plurality of images acquired by the image acquisition device and the acquisition time of the plurality of images;

[0080] Step 303: Determine the moment of inertia of the rotating member according to the size and mass of the rotating member;

[0081] Step 304: determining the cavitation load moment according to the horizontal distance between the axis of the vibrating member and the axis of the rotating member, and the size of the rotating member and the size of the vibrating member;

[0082] Step 305: Determine the maximum tolerable cavitation load of the bubble group of the hydraulic machinery under test according to the moment of inertia, the cavitation load torque and the rotational acceleration.

[0083] Specifically, the cavitation load measuring device is first started to generate the cavitation load, and a plurality of images are collected by an image acquisition device. The plurality of images collected by the image acquisition device can be sent to other devices that communicate with the image acquisition device for processing, or the measuring device itself can process them. During the processing, the rotational acceleration of the rotating member can be calculated based on the plurality of images and the acquisition time of the plurality of images.

[0084] It should be noted that the calculation of the rotational acceleration of the rotating part is not limited to being calculated based on the acquisition time. In one example, each image acquired by the image acquisition device has a corresponding timestamp, which is automatically generated by the image acquisition device when acquiring the image. The rotational acceleration of the rotating part can be calculated based on multiple images and the timestamps of the multiple images. In another example, the interval time for image acquisition is pre-set, and then an image is acquired at the same interval. In this way, the rotational acceleration of the rotating part can also be calculated.

[0085] The dimensions of the vibrating part include the radius R. The dimensions of the rotating part include the length and radius r which can be measured by a caliper, with the length given as 1; the mass m can be measured by a balance. The moment of inertia of the rotating part can be calculated based on the dimensions and mass of the rotating part:

[0086] J=mr 2

[0087] In some embodiments, determining the cavitation load moment according to the horizontal distance between the axis of the vibrating member and the axis of the rotating member, and the size of the rotating member and the size of the vibrating member may include:

[0088] The cavitation load moment is determined according to the first formula, which is:

[0089]

[0090] Wherein, M is the cavitation load moment, r is the size of the rotating part, R is the size of the vibrating part, and d is the horizontal distance between the axis of the vibrating part and the axis of the rotating part.

[0091] After calculating the cavitation load torque, the cavitation load of the bubble group can be calculated by combining the rotational inertia and the rotational acceleration. Then, multiple measurements are performed, and the cavitation load generated each time is gradually increased, and the state of the rotating parts is observed while the measurement is performed. If cavitation is observed in the rotating parts during the i-th measurement, the cavitation load obtained in the i-1th measurement is used as the maximum tolerable cavitation load of the hydraulic machinery under test.

[0092] In some embodiments, determining the maximum tolerable cavitation load of the tested hydraulic machinery based on the moment of inertia, the cavitation load torque, and the rotational acceleration may include:

[0093] The maximum tolerable cavitation load of the cavitation bubble group is determined according to the second formula, which is:

[0094] Jα=FM

[0095] Among them, J is the moment of inertia, α is the rotational acceleration, F is the cavitation load of the bubble group, and M is the cavitation load torque.

[0096] In some embodiments, after determining the maximum tolerable cavitation load of the measured hydraulic machinery according to the moment of inertia, the cavitation load torque, and the rotational acceleration, the measurement method may further include:

[0097] Determine the force area of ​​the cavitation load according to the horizontal distance between the axis of the vibrating part and the axis of the rotating part;

[0098] The cavitation stress value is determined based on the maximum cavitation load that can be sustained by the bubble group and the force-bearing area of ​​the cavitation load;

[0099] The area of ​​a single cavitation bubble was determined from the images;

[0100] The maximum cavitation load that the tested hydraulic machinery can withstand for a single cavity is determined based on the cavitation stress value and the area of ​​the single cavity.

[0101] Specifically, based on the calculated cavitation load of the bubble group, the cavitation load of a single bubble can be further calculated, and then the cavitation load of the single bubble can be used to evaluate the maximum tolerable cavitation load of the hydraulic machinery under test.

[0102] First, the force area of ​​the cavitation load can be determined based on the horizontal distance between the axis of the vibrating part and the axis of the rotating part. Figure 4 , is a top view schematic diagram of a cavitation load measurement device provided in a specific embodiment of the present application. Figure 4As shown, the center O is the center of the vibrating part, and the area of ​​the ultrasonic cavitation load applied by the vibrating part to the rotating part is the shaded area S, which is the area of ​​the arc intersected by the vibrating part and the rotating part. The starting point of the shaded area S on the x-axis is A, and the end point is B. The coordinates of point A are (dr, 0), and the coordinates of point B are (R, 0). The area of ​​S is the definite integral from point A to point B, and the formula is as follows:

[0103]

[0104] After obtaining the stress area S, the cavitation stress value can be determined according to the maximum cavitation load F that can be tolerated by the cavitation group and the stress area S of the cavitation load, which is F / S. Furthermore, the radius a of a single cavitation bubble is obtained through the image collected by the image acquisition device, and then the area πa of a single cavitation bubble is obtained. 2 Finally, the cavitation stress value is multiplied by the area of ​​a single cavitation bubble to obtain the cavitation load of a single cavitation bubble. Similarly, multiple measurements are performed, and the cavitation load generated each time is gradually increased, and the state of the rotating parts is observed while the measurements are performed. If cavitation is observed in the rotating parts during the i-th measurement, the cavitation load obtained in the i-1-th measurement is used as the maximum tolerable cavitation load of the hydraulic machinery under test.

[0105] In this way, the cavitation load is indirectly obtained by measuring the rotational speed. There is no need to use a load sensor, nor does it rely on the pit size for calculation. There is no cavitation deformation assumption. The measurement method, data processing method and calculation method are relatively simple, which improves the accuracy of the measurement results.

[0106] A third aspect of an embodiment of the present application provides a machine-readable storage medium, on which instructions are stored. When the instructions are executed by a processor, the processor implements the above-mentioned cavitation load measurement method.

[0107] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0108] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0109] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0110] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0111] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0112] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0113] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

[0114] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A cavitation load measuring device, characterized in that: The measuring device comprises: Containers for holding liquids; A cavitation load generating unit; the cavitation load generating unit comprises a vibrator; the vibrator is disposed in the liquid contained in the container, and the cavitation load generating unit is used to trigger the liquid to generate a cavitation load; A rotating unit; the rotating unit is arranged in the container and spaced apart from the vibrating member, the rotating unit comprises a rotating member and a support frame for supporting the rotating member, the support frame is fixedly arranged with the container, the axis of the rotating member is perpendicular to the axis of the cavitation load generating unit; the rotating member rotates under the action of the cavitation load, a tracing point is marked on the rotating member, and the material of the rotating member is consistent with the material of the hydraulic machinery to be measured; An image acquisition device is used to acquire multiple images of the container, wherein the multiple images include images of rotating parts or images of cavitation bubbles in the container; and the maximum tolerable cavitation load of the rotating parts can be determined based on the multiple images, thereby determining the maximum tolerable cavitation load of the hydraulic machinery under test.

2. The measuring device according to claim 1, characterized in that The rotating part comprises a rotating body and a tracer sheet sleeved on the rotating body, the tracer point is marked on the tracer sheet, and the material of the rotating body is the same as that of the hydraulic machinery to be measured.

3. The measuring device according to claim 1, characterized in that The rotating member and the vibrating member are staggered in the horizontal direction.

4. The measuring device according to claim 1, characterized in that The cavitation load generating unit further comprises: an ultrasonic generator, arranged above the container and located on a side of the vibrating member away from the rotating member, the ultrasonic generator being used to generate ultrasonic waves; The amplifier has two ends respectively connected to the ultrasonic generator and the vibrating element, and is used to amplify the ultrasonic wave.

5. The measuring device according to claim 1, characterized in that The image acquisition device comprises: A first image acquisition device, arranged opposite to a side of the rotating member marked with the tracing point, and used for acquiring an image of the tracing point; The second image acquisition device is used to acquire images of cavitation bubbles in the container.

6. A method for measuring cavitation load, characterized in that: The device for measuring cavitation load according to any one of claims 1 to 5, wherein the measuring method comprises: Starting the cavitation load measuring device to generate cavitation load, and acquiring a plurality of images through the image acquisition device; determining the rotational acceleration of the rotating member according to the plurality of images acquired by the image acquisition device and the acquisition time of the plurality of images; Determining the moment of inertia of the rotating member according to the size and mass of the rotating member; Determine the cavitation load moment according to the horizontal distance between the axis of the vibrating member and the axis of the rotating member, as well as the size of the rotating member and the size of the vibrating member; The maximum tolerable cavitation load of the bubble group of the hydraulic machinery under test is determined according to the rotational inertia, the cavitation load action torque and the rotational acceleration.

7. The measuring method according to claim 6, characterized in that: After determining the maximum tolerable cavitation load of the measured hydraulic machinery according to the rotational inertia, the cavitation load torque and the rotational acceleration, the measuring method further comprises: Determining the force bearing area of ​​the cavitation load according to the horizontal distance between the axis of the vibrating member and the axis of the rotating member; Determine the cavitation stress value according to the maximum tolerable cavitation load of the bubble group and the force bearing area of ​​the cavitation load; determining the area of ​​a single cavitation bubble based on the image; The maximum cavitation load that the tested hydraulic machinery can withstand for a single cavitation bubble is determined according to the cavitation stress value and the area of ​​the single cavitation bubble.

8. The measuring method according to claim 6, characterized in that: Determining the cavitation load moment according to the horizontal distance between the axis of the vibrating member and the axis of the rotating member, and the size of the rotating member and the size of the vibrating member comprises: The cavitation load moment is determined according to a first formula, which is: Wherein, M is the cavitation load moment, r is the size of the rotating member, R is the size of the vibrating member, and d is the horizontal distance between the axis of the vibrating member and the axis of the rotating member.

9. The measuring method according to claim 6, characterized in that: The method of determining the maximum tolerable cavitation load of the tested hydraulic machinery according to the moment of inertia, the cavitation load torque and the rotational acceleration includes: The maximum tolerable cavitation load of the cavitation bubble group is determined according to the second formula, which is: Jα=FM Among them, J is the moment of inertia, α is the rotational acceleration, F is the cavitation load of the bubble group, and M is the cavitation load torque.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the method for measuring the cavitation load according to any one of claims 6 to 9 is implemented.

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