Water tunnel test device

Abstract

The utility model relates to a water tunnel testing device, which belongs to the technical field of fluid mechanics tests and comprises a reservoir, a drainage section, a loading section, a stabilizing section and an experimental section. Wherein the reservoir is used as a water source of the water tunnel test device; the drainage section is connected with the reservoir and comprises a drainage tube with openings at two ends having different diameters; the loading section comprises a plurality of loading branches, each loading branch is connected with the drainage tube, each loading branch is provided with a loading water pump, and each loading water pump is provided with a controller; the stabilizing section is connected with the loading section and comprises a connecting pipe, a flow velocity sensor is arranged on the connecting pipe, and the flow velocity sensor is electrically connected with each controller; the experimental section is connected with the stable section. The device accelerates fluid through gravitational potential energy provided by the reservoir and a plurality of loading water pumps of the loading section, so that the flow velocity is remarkably increased, meanwhile, the power consumption is reduced, the experiment time is prolonged, and the device can adapt to a test model with a larger size.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid mechanics testing, and in particular relates to a water tunnel testing device. Background Art

[0002] The water tunnel device is a major experimental device for fluid dynamics research. Compared with the wind tunnel, its experimental fluid medium is water, which has the characteristics of high density, low mass diffusion and low flow velocity. It plays an irreplaceable role in the research fields of cavitation, supercavitation, turbulence, etc. Therefore, the water tunnel device is mainly used to study fluid dynamics problems such as ship motion, underwater propulsion, cavitation phenomenon and hydraulic machinery.

[0003] In the prior art, the design flow rate and Reynolds number of water tunnel devices are generally low. The diameter of the experimental section is generally small due to site restrictions, and the diameter is mostly within 1m. In addition, the loading method is single, the experimental time is short, and the experimental cost is high, which can only meet the scaled model experiments with low flow rate and low Reynolds number. For example, the Chinese invention patent CN108827591A provides a gravity-type circulating water tunnel for underwater complex surface drag reduction measurement, which provides power for the water tunnel device through the gravity potential energy provided by the high-level water tank, and at the same time maintains the water level of the high-level water tank through the liquid level control system to provide stable gravity potential energy; this method only uses the water's own gravity to provide power, the water loading method is single, and the flow rate that can be provided is limited. In addition, the Chinese utility model patent CN1207546C provides a low-water-level gravity water tunnel with high flow rate and low turbulence. It uses a gravity water tank and a pump group to load together. The water pump loading makes up for the defect of insufficient power provided by the gravity water tank. This patent cannot accurately control the flow rate of the experimental section. Moreover, the size of the gravity water tank of this patent is 2m×2m×2.5m, and the cross-sectional size of the experimental section is 0.2m×0.2m. Therefore, this patent is only suitable for experiments with low-water-level, small-diameter scale models, and requires a large power provided by the water pump, which consumes a lot of electricity. For models with larger sizes, the experimental section of this patent cannot accommodate them and cannot provide sufficient power. Under the trend of global competition for marine scientific research, marine observation, and the development of underwater high-speed vehicles, the water tunnel device with immutable, small-diameter, and low-flow rate can no longer meet the current development needs of advanced equipment such as underwater ultra-high-speed vehicles.

[0004] Therefore, how to provide a water tunnel test device with low experimental cost and high flow rate control is a technical problem that needs to be solved urgently. Utility Model Content

[0005] In view of the shortcomings in the prior art, the utility model provides a water tunnel test device, which accelerates the fluid through the gravitational potential energy provided by the water reservoir and multiple loading water pumps in the loading section, thereby significantly increasing the flow rate, while effectively reducing power consumption and extending the experimental time, so that the water tunnel test device can adapt to larger test models.

[0006] The utility model provides a water tunnel test device, comprising:

[0007] A water reservoir, which is provided with a water inlet and a water outlet, serves as a water source for the water tunnel test device, and water flows out from the water outlet;

[0008] The drainage section is connected to the water outlet of the water reservoir, and includes a drainage pipe with openings of different diameters at both ends, and the end of the drainage pipe with a larger opening diameter is used to connect to the water reservoir;

[0009] The loading section includes a plurality of loading branches, each of which is connected to an end of the drainage pipe with a smaller opening, each of which is provided with a loading water pump for providing power, and each of which is provided with a controller;

[0010] The stabilizing section is connected to the loading section and includes a connecting pipe, on which a flow velocity sensor for measuring the velocity of the fluid in the connecting pipe is provided, and the flow velocity sensor is electrically connected to the controller of each loading water pump respectively;

[0011] The experimental section is connected to the stable section and is used to accommodate the test model for testing.

[0012] This technical solution accelerates the fluid through the gravitational potential energy provided by the water reservoir and multiple loading water pumps in the loading section, which can significantly increase the flow rate, while effectively reducing power consumption and extending the test time, so that the water tunnel test device can adapt to larger test models.

[0013] In some of the embodiments, the water tunnel test device also includes a drainage pool, one end of which is connected to the experimental section, and the other end of which is connected to the water inlet of the reservoir, for temporarily storing the test water.

[0014] In some embodiments, the water tunnel test device further includes a return pipe, one end of which is connected to the drainage tank and the other end is connected to the water storage tank; the return pipe is provided with a pumping unit, which is used to pump the test water in the drainage tank back to the water storage tank. This technical solution connects the drainage tank and the water storage tank through the return pipe to form a closed-loop system, and the pumping unit is used to pump the test water in the drainage tank back to the water storage tank to achieve water recycling.

[0015] In some embodiments, the depth of the reservoir is not less than 100 meters. This technical solution can fully utilize the gravitational potential energy of the fluid itself to provide a more powerful acceleration for the fluid, thereby reducing the use of loading water pumps.

[0016] In some embodiments, an observation room for observing the experimental process is provided on the periphery of the experimental section. The technical solution facilitates researchers to observe the experimental process in real time through the provision of the observation room.

[0017] In some embodiments, the water tunnel test apparatus further comprises:

[0018] A pressure stabilizing section, which is connected to the stabilizing section, includes a pressure stabilizing chamber, which is connected to the connecting pipe and is used to adjust the pressure of the upstream flow;

[0019] A rectifying section, which is connected to the voltage stabilizing section and is provided with a guide cover for eliminating radial velocity;

[0020] The contraction section has one end connected to the rectifying section and the other end connected to the experimental section; the openings at both ends of the contraction section have different diameters, the opening with a larger diameter of the contraction section is used to connect to the rectifying section, and the opening with a smaller diameter of the contraction section is used to connect to the experimental section, so as to reduce the turbulence of the fluid;

[0021] A back pressure section, which is connected to the diffuser section and includes a pressure holding chamber for adjusting the back pressure of the water tunnel to control cavitation;

[0022] The diffusion section has one end connected to the experimental section and the other end connected to the back pressure section. The openings at both ends of the diffusion section have different diameters. The opening with a larger diameter in the diffusion section is used to connect to the back pressure section, and the opening with a larger diameter in the diffusion section is used to connect to the experimental section, so as to convert the kinetic energy of the fluid into pressure energy.

[0023] In some embodiments, the voltage stabilizing section is further provided with a side flow gate control, which is installed at the connection between the voltage stabilizing section and the rectifying section to adjust the flow rate of the incoming flow. The technical solution helps to accurately control the experimental conditions through the setting of the side flow gate control.

[0024] In some of the embodiments, the rectifying section is further provided with a first gate, which is arranged between the voltage stabilizing section and the flow guide cover and is used to adjust the incoming flow rate to reduce turbulence.

[0025] In some embodiments, a filter screen is provided at the connection between the drainage pipe and the water reservoir. The technical solution prevents impurities from entering the water tunnel test process through the provision of the filter screen, which helps to maintain the purity of the test water.

[0026] In some embodiments, the drainage section is further provided with a second gate, which is arranged between the drainage pipe and the loading section, and is used to prevent impurities from entering the loading section during the normally closed period. This technical solution ensures that silt impurities and the like will not enter the pipeline during non-test time by setting the second gate, which helps to maintain the cleanliness of the water tunnel experimental device.

[0027] Based on the above scheme, the water tunnel test device in the embodiment of the utility model can significantly increase the flow rate by accelerating the fluid through the gravitational potential energy provided by the water reservoir and the multiple loading water pumps in the loading section, while effectively reducing power consumption and extending the experimental time, so that the water tunnel test device can adapt to larger test models; at the same time, through the setting of the flow rate sensor and the controller of the loading water pump, while providing real-time flow rate data for the test, it can also achieve precise control and adjustment of the fluid velocity, thereby improving the efficiency and accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0029] Figure 1 This is a schematic diagram of the structure of the water tunnel experiment device in the embodiment of the utility model;

[0030] Figure 2 This is a schematic diagram of the structural disassembly of the water tunnel experimental device in the embodiment of the utility model;

[0031] Figure 3 This is a result diagram of the simulation analysis of the experimental section in the embodiment of the present utility model.

[0032] In the figure:

[0033] 1. Reservoir; 2. Drainage section; 3. Loading section; 4. Stable section; 5. Pressure stabilizing section; 6. Rectification section; 7. Contraction section; 8. Experimental section; 9. Observation room; 10. Diffusion section; 11. Back pressure section; 12. Drainage tank; 13. Pumping group;

[0034] 201, drainage tube; 202, filter screen; 203, second gate control;

[0035] 301, loading branch; 302, loading water pump;

[0036] 401, connecting pipe; 402, flow rate sensor;

[0037] 501, pressure stabilizing chamber; 502, hydraulic cylinder; 503, side flow gate control;

[0038] 601, deflector; 602, first gate control;

[0039] 1101. Pressure-maintaining chamber; 1102. Back-pressure tank. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The terms "system", "unit" and "module" used in this document are a method for distinguishing different components, elements, parts, portions or assemblies at different levels, and these terms may be replaced by other expressions that can achieve the same purpose.

[0045] like Figure 1-Figure 2As shown, in one embodiment of the water tunnel test device of the utility model, the water tunnel test device includes a water reservoir 1, a drainage section 2, a loading section 3, a stabilization section 4 and an experimental section 8; wherein the water reservoir 1 is provided with a water inlet and a water outlet, serving as a water source for the water tunnel test device, and water flows out from the water outlet; the drainage section 2 is connected to the water outlet of the water reservoir 1, and includes a drainage pipe 201 with different opening diameters at both ends, and the end of the drainage pipe 201 with a larger opening diameter is used to connect to the water reservoir 1; the loading section 3 includes a plurality of loading branches 301, each loading branch 301 is connected to the water outlet of the water reservoir 1, and the ... the drainage pipe 201 is connected to the water outlet of the water reservoir 1, and the drainage pipe 201 is connected to the water reservoir 1; the loading section 3 includes a plurality of loading branches 301, each loading branch 301 is connected to the water outlet of the water reservoir 1, and the water flows out from the water outlet; the drainage section 2 is connected to the water outlet of the water reservoir 1, and the drainage pipe 201 is connected to the water reservoir 1; the loading section 3 includes a plurality of loading branches 301, each loading branch 301 is connected to the water reservoir 1; the loading section 3 includes a plurality of loading branches 301, each loading branch 301 is connected to the water reservoir The loading branches 301 are all connected to the end with the smaller opening of the drainage pipe 201, and each loading branch 301 is provided with a loading water pump 302 for providing power, and each loading water pump 302 is provided with a controller; the stable section 4 is connected to the loading section 3, including a connecting pipe 401, and the connecting pipe 401 is provided with a flow rate sensor 402 for measuring the fluid velocity in the connecting pipe 401, and the flow rate sensor 402 is electrically connected to the controller of each loading water pump 302; the experimental section 8 is connected to the stable section 4, and is used to accommodate the test model for testing.

[0046] In the above-mentioned schematic embodiment, the water tunnel test device accelerates the fluid through the gravitational potential energy provided by the water reservoir 1 and the multiple loading water pumps 302 of the loading section 3, which can significantly increase the flow rate, while effectively reducing power consumption and extending the test time, so that the water tunnel test device can adapt to larger-sized test models; at the same time, through the setting of the flow rate sensor 402 and the controller of the loading water pump 302, while providing real-time flow rate data for the test, it can also achieve precise control and adjustment of the fluid velocity, thereby improving the efficiency and accuracy of the test.

[0047] It should be noted that the specifications of the loading water pump 302 need to be selected based on simulation analysis and calculation, and the parameters such as the water pump power and head are calculated according to the loading energy, so that under normal working conditions, the water pump power reaches 70%-80% of the rated power, and the controller selects a variable frequency motor to control the stepless speed regulation of the loading water pump 302. It should be noted that the loading water pump 302 needs to be equipped with a backup pump.

[0048] In some embodiments, Figure 1 As shown, one end of the drain tank 12 is connected to the experimental section 8, and the other end is connected to the water inlet of the reservoir 1 for temporarily storing the test water.

[0049] In some embodiments, Figure 1 As shown, the water tunnel test device also includes a return pipeline, one end of which is connected to the drain tank 12, and the other end is connected to the reservoir 1; the return pipeline is provided with a pumping group 13, and the pumping group 13 is used to pump the test water in the drain tank 12 back to the reservoir 1. The drain tank 12 and the reservoir 1 are connected by the return pipeline to form a closed-loop system. The pumping group 13 is used to pump the test water in the drain tank 12 back to the reservoir 1, so as to realize the recycling of water, help save water resources, and reduce the impact on the external environment.

[0050] Furthermore, if Figure 1 As shown, the depth of the reservoir 1 is not less than 100 meters. When the depth of the reservoir 1 is not less than 100 meters, the gravity potential energy of the fluid itself can be fully utilized to provide a more powerful acceleration for the fluid, thereby reducing the use of the loading water pump 302 to save electricity; and the water contained in the deep reservoir 1 can support the test for a longer time. Figure 3 As shown, through simulation analysis, when the depth of reservoir 1 is 100 meters, the incoming flow pressure is generally around 1MPa, which can accelerate the fluid to 39.5m / s.

[0051] It should be noted that the water tunnel test device in this embodiment is built underground, and the maximum diameter of the experimental section 8 can reach more than 1 meter. Through the setting of a large-depth water reservoir 1 and multiple loading water pumps 302, sufficient acceleration is provided for the fluid, and creative conditions are created for increasing the diameter of the experimental section 8. According to simulation analysis, when the depth of the water reservoir 1 is 100 meters and three loading water pumps 302 are set in the loading section 3, the maximum diameter of the experimental section 8 can reach more than 1 meter, and the velocity of the inflowing fluid can be accelerated to at least 40m / s.

[0052] In some embodiments, Figure 1 As shown, an observation room 9 for observing the experimental process is provided on the periphery of the experimental section 8. The setting of the observation room 9 facilitates the researchers to observe the experimental process in real time, provides the researchers with direct visual feedback of fluid mechanics phenomena, model behaviors and other key parameters, and facilitates data collection, analysis and optimization.

[0053] In some embodiments, Figure 2As shown, the water tunnel test device also includes a pressure stabilizing section 5, a rectifying section 6, a contraction section 7, a back pressure section 11 and a diffusion section 10; wherein, the pressure stabilizing section 5 is connected to the stabilizing section 4, and the pressure stabilizing section 5 includes a pressure stabilizing chamber 501, which is connected to the connecting pipe 401 and is used to adjust the pressure of the upstream flow; the rectifying section 6 is connected to the pressure stabilizing section 5, and the rectifying section 6 is provided with a guide cover 601 for eliminating radial velocity; the provision of the guide cover 601 is conducive to reducing turbulence, making the fluid more uniform, and improving the reliability of the experiment; one end of the contraction section 7 is connected to the rectifying section 6, and the other end is connected to the experimental section 8; the diameters of the openings at both ends of the contraction section 7 are different, and the contraction section 7 has a larger diameter The opening of the contraction section 7 is used to connect to the rectifying section 6, and the opening with a smaller diameter of the contraction section 7 is used to connect to the experimental section 8, which is used to reduce the turbulence of the fluid; the back pressure section 11 is connected to the diffusion section 10, including a pressure holding chamber 1101, which is used to adjust the back pressure of the water tunnel to control cavitation, which is very important for simulating the fluid behavior under different pressure conditions; one end of the diffusion section 10 is connected to the experimental section 8, and the other end is connected to the back pressure section 11; the diameters of the openings at both ends of the diffusion section 10 are different, the opening with a larger diameter of the diffusion section 10 is used to connect to the back pressure section 11, and the opening with a larger diameter of the diffusion section 10 is used to connect to the experimental section 8, which is used to convert the kinetic energy of the fluid into pressure energy, which helps to achieve a smooth transition of the fluid.

[0054] In some embodiments, Figure 1 As shown, the voltage stabilizing section 5 is also provided with a side flow gate control 503, which is installed at the connection between the voltage stabilizing section 5 and the rectifying section 6 to adjust the flow rate of the incoming flow. The setting of the side flow gate control 503 helps to accurately control the experimental conditions.

[0055] In some embodiments, Figure 1 As shown, the rectifying section 6 is further provided with a first gate control 602, which is arranged between the pressure stabilizing section 5 and the flow guide cover 601, and is used to adjust the incoming flow rate to reduce turbulence.

[0056] In some embodiments, Figure 1 As shown, a hydraulic cylinder 502 for adjusting the pressure of the stabilizing chamber 501 is provided above the stabilizing chamber 501, and a back pressure tank 1102 for adjusting the pressure of the pressure holding chamber 1101 is provided above the pressure holding chamber 1101. The hydraulic cylinder 502 provides kinetic energy for the pressure adjustment of the stabilizing chamber 501, which can not only ensure the stability of the incoming flow pressure, but also reduce the negative impact of the incoming flow flowing through the loading water pump 302. Since the top of the drain tank 12 is an open outlet, the pressure of the pressure holding chamber 1101 is adjusted by the back pressure tank 1102, and the fluid pressure at the end of the water tunnel is controlled to adjust the back pressure of the water tunnel and better control cavitation.

[0057] In some embodiments, Figure 1As shown, a filter screen 202 for filtering is provided at the connection between the drainage pipe 201 and the water reservoir 1. The filter screen 202 is provided to prevent impurities from entering the water tunnel test process, which helps to maintain the purity of the test water.

[0058] In some embodiments, Figure 1 As shown, the drainage section 2 is further provided with a second gate control 203, which is arranged between the drainage pipe 201 and the loading section 3, and is used to prevent impurities from entering the loading section 3 during the normally closed period. The second gate control 203 is arranged to ensure that silt impurities and the like will not enter the pipeline during non-test time, which helps to maintain the cleanliness of the water tunnel experimental device.

[0059] Based on the above-mentioned water tunnel test device, the water tunnel test method applied to the water tunnel test device is described below. The water tunnel test method includes the following steps:

[0060] S1, the fluid enters the loading section 3 from the water reservoir 1 through the drainage section 2, and the loading water pump 302 of each loading branch 301 provides loading power for the fluid;

[0061] S2, the fluid is accelerated and enters the stable section 4, and the flow rate of the fluid in the stable section 4 is obtained by the flow rate sensor 402;

[0062] S3, according to the cross-sectional ratio of the stable section 4 and the experimental section 8, combined with the flow velocity of the fluid in the stable section 4, the flow velocity of the fluid in the experimental section 8 is obtained;

[0063] S4, controlling the flow rate of each loading water pump 302 through the controller so that the flow rate of the fluid in the experimental section 8 meets the test requirements;

[0064] S5, the fluid passes through the experimental section 8 and enters the drainage tank 12 for temporary storage.

[0065] In the above-mentioned schematic embodiment, the gravitational potential energy provided by the water reservoir 1 and the loading water pump 302 are used together to accelerate the fluid, which can provide a stable power source for the water tunnel test and improve the experimental efficiency; and, by calculating the flow velocity of the experimental section 8 and combining with the controller of the loading water pump 302, the fluid flow velocity can be accurately controlled to improve the real-time and accuracy of the experimental data.

[0066] In some embodiments, in step S3, the flow rate v of the experimental section 8 is obtained by formula (1): s , the expression of formula (1) is:

[0067]

[0068] Among them, d w is the diameter of the connecting pipe 401 of the stabilizing section 4, d s is the diameter of the pipeline in the experimental section 8, v sis the flow rate of the fluid in experimental section 8, v w is the flow rate of the fluid in stable section 4.

[0069] In some embodiments, before the fluid enters the experimental section 8, it also includes: the fluid passes through the stable section 4 and sequentially passes through the pressure stabilizing section 5, the rectifying section 6, and the contraction section 7 to enter the experimental section 8; wherein, the pressure stabilizing section 5 adjusts the incoming flow pressure through the pressure stabilizing chamber 501, the rectifying section 6 eliminates the radial velocity of the fluid through the guide cover 601, and the contraction section 7 reduces the turbulence of the fluid through the contraction ratio with different diameters at both ends; in step S5, after passing through the experimental section 8, the fluid passes through the diffusion section 10 and the back pressure section 11 and sequentially enters the drainage tank 12; wherein, the diffusion section 10 converts the kinetic energy of the fluid into pressure energy through the diffusion ratio with different diameters at both ends, and the back pressure section 11 adjusts the water hole back pressure through the pressure holding chamber 1101 to control cavitation.

[0070] It should be noted that the water tunnel test device provided by the utility model has been verified by simulation analysis. Specifically, the water tunnel test device provided by the utility model can meet the model of high Reynolds number, which can be verified by formula (2). The expression of formula (2) is:

[0071]

[0072] Among them, R e is the Reynolds number, and μ is the fluid viscosity coefficient. In this embodiment, the incoming flow can be accelerated to more than 40 m / s through the combined loading of the water reservoir 1 and multiple loading water pumps 302, providing support for solving the fluid dynamics problem of high-speed navigation bodies.

[0073] It should also be noted that when conducting fluid dynamics experiments, it is necessary to ensure that the fluid non-uniformity β of each cross section of the experimental section 8 is 1 and β 2 The flow rate non-uniformity formula is as follows:

[0074]

[0075]

[0076] Among them, u max is the maximum velocity in the center of experimental section 8 (i.e., the axial position of the pipeline in experimental section 8), u min is the minimum velocity in the center of experimental section 8, u m is the average velocity in the center of experimental section 8, u i is the velocity of each point in the central area of ​​experimental section 8.

[0077] In this embodiment, the utility model adopts a cubic curve as the curve of the contraction section 7, and the curve equation is as follows:

[0078]

[0079] Among them, n is an empirical value and can be set according to specific circumstances. In this embodiment, n is 7, R is the radius of the opening end of the larger diameter of the contraction section 7, r is the radius of the opening end of the smaller diameter of the contraction section 7, L is the length of the contraction section 7, and f(x) is the radius of the curve at x.

[0080] At the same time, in order to ensure that the fluid does not separate after passing through the contraction section 7, thereby generating small turbulence that affects the test effect of the experimental section 8, it is necessary to perform fluid separation verification. Formula (6) is used for separation verification. When formula (6) is established, there is no risk of fluid separation. The expression of formula (6) is:

[0081]

[0082] Among them, the pressure coefficient C p =1-(u e / u m ) 2 ,u e is the potential flow velocity on the boundary of the boundary layer, S is a constant, usually taken as 0.35.

[0083] Through the description of multiple embodiments of the water tunnel test device of the utility model, it can be seen that the embodiments of the water tunnel test device of the utility model have at least one or more of the following advantages:

[0084] 1. The water tunnel test device provided by the utility model can significantly increase the flow rate by using the gravity potential energy provided by the water reservoir 1 and the multiple loading water pumps 302 of the loading section 3 to accelerate the fluid, while effectively reducing power consumption and extending the test time, so that the water tunnel test device can adapt to test models of larger sizes;

[0085] 2. The water tunnel test device provided by the utility model, through the setting of the flow rate sensor 402 and the controller of the loading water pump 302, can not only provide real-time flow rate data for the test, but also realize accurate control and regulation of the fluid velocity, thereby improving the efficiency and accuracy of the test.

[0086] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0087] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A water tunnel test device, characterized in that: include: A water reservoir, which is provided with a water inlet and a water outlet, serves as a water source for the water tunnel test device, and water flows out from the water outlet; The drainage section is connected to the water outlet of the water reservoir, and includes a drainage pipe with openings of different diameters at both ends, and the end of the drainage pipe with a larger opening diameter is used to connect to the water reservoir; The loading section includes a plurality of loading branches, each of which is connected to an end of the drainage pipe with a smaller opening, each of which is provided with a loading water pump for providing power, and each of which is provided with a controller; The stabilizing section is connected to the loading section and includes a connecting pipe, on which a flow velocity sensor for measuring the velocity of the fluid in the connecting pipe is provided, and the flow velocity sensor is electrically connected to the controller of each loading water pump respectively; The experimental section is connected to the stable section and is used to accommodate the test model for testing.

2. The water tunnel test device according to claim 1, characterized in that: It also includes a drain tank, one end of which is connected to the experimental section, and the other end is connected to the water inlet of the reservoir, for temporarily storing the test water.

3. The water tunnel test device according to claim 2, characterized in that: It also includes a return pipeline, one end of which is connected to the drain tank, and the other end is connected to the water storage tank; the return pipeline is provided with a pumping pump group, and the pumping pump group is used to pump the test water in the drain tank back to the water storage tank.

4. The water tunnel test device according to claim 1, characterized in that: The depth of the reservoir shall not be less than 100 meters.

5. The water tunnel test device according to claim 1, characterized in that: There is an observation room outside the experimental section for observing the experimental process.

6. The water tunnel test device according to claim 1, characterized in that: Also includes: A pressure stabilizing section, which is connected to the stabilizing section, includes a pressure stabilizing chamber, which is connected to the connecting pipe and is used to adjust the pressure of the upstream flow; A rectifying section, which is connected to the voltage stabilizing section and is provided with a guide cover for eliminating radial velocity; The contraction section has one end connected to the rectifying section and the other end connected to the experimental section; the openings at both ends of the contraction section have different diameters, the opening with a larger diameter of the contraction section is used to connect to the rectifying section, and the opening with a smaller diameter of the contraction section is used to connect to the experimental section, so as to reduce the turbulence of the fluid; A back pressure section, which is connected to the diffuser section and includes a pressure holding chamber for adjusting the back pressure of the water tunnel to control cavitation; The diffusion section has one end connected to the experimental section and the other end connected to the back pressure section. The openings at both ends of the diffusion section have different diameters. The opening with a larger diameter in the diffusion section is used to connect to the back pressure section, and the opening with a larger diameter in the diffusion section is used to connect to the experimental section, so as to convert the kinetic energy of the fluid into pressure energy.

7. The water tunnel test device according to claim 6, characterized in that: The voltage stabilizing section is also provided with a side flow gate control, which is installed at the connection between the voltage stabilizing section and the rectifying section to adjust the incoming flow rate.

8. The water tunnel test device according to claim 6, characterized in that: The rectifying section is also provided with a first gate control, which is arranged between the voltage stabilizing section and the flow guide cover and is used to adjust the incoming flow rate to reduce turbulence.

9. The water tunnel test device according to claim 1, characterized in that: A filter net for filtering is arranged at the connection between the drainage pipe and the water reservoir.

10. The water tunnel test device according to claim 1, characterized in that: The drainage section is also provided with a second gate, which is arranged between the drainage pipe and the loading section and is used to prevent impurities from entering the loading section during the normally closed period.

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