Icing wind tunnel spray equipment and water supply pressure rapid response device and method thereof

Abstract

The present invention relates to the technical field of anti-icing performance test of aircraft, and discloses an icing wind tunnel spray equipment and a water supply pressure rapid response device and method thereof, comprising a gradient tube, a water tank, a control device and a plurality of spray assemblies, wherein the top of the gradient tube is higher than the bottom, and the top and bottom of the gradient tube are both provided with pressure sensing devices, and the cross-sectional area of ​​the gradient tube gradually decreases in the direction from the top to the bottom, the water tank is connected to the top of the gradient tube through a first pipeline, and the water tank is connected to the bottom of the gradient tube through a second pipeline, a switch valve and a booster pump are provided on the first pipeline to pump water in the water tank into the top of the gradient tube and make the water flow in the gradient tube, and a flow control valve is provided on the second pipeline; the control device is electrically connected to the booster pump and the two pressure sensing devices, and the spray assembly is arranged along the length direction of the gradient tube. In this way, the water supply pressure in the gradient tube can be adjusted before the spray assembly is turned on, and there is no invalid icing cloud.

Description

Technical Field

[0001] The present invention relates to the technical field of testing and experiment of anti-icing performance of aircraft, and more specifically to an icing wind tunnel spray device and a water supply pressure rapid response device and method thereof. Background Art

[0002] The icing wind tunnel is a large-scale special wind tunnel with complex performance. It is a ground test equipment for studying the icing form, icing tolerance and anti-icing (de-icing) technology of the windward surfaces of different components and the external sensing parts of the detection instruments when the aircraft flies under icing meteorological conditions. The core component of its icing meteorological conditions is the icing cloud generator, which is generated by the nozzle array installed on the multiple spray rods of the spray equipment in the spray section of the icing wind tunnel. The parameters of the icing cloud are achieved by adjusting the pressure and temperature of the water and air supply of the spray equipment.

[0003] The goal of regulating the water supply pressure of the spray equipment in the freezing wind tunnel is to synchronously adjust the water supply pressure of the nozzles on all spray bars to a specified value in a short time. At present, there are three main methods for regulating the water supply pressure of the spray system in freezing wind tunnels at home and abroad: 1. Use a single water supply pressure source to directly supply water to the nozzles on all spray bars. The pressure parameter adjustment amount is single and the adjustment speed is fast, but it cannot eliminate the pressure deviation caused by the height difference between the spray bars. This method is suitable for small-sized freezing wind tunnels with small spray bar height differences. 2. Use a single water supply pressure source to connect to the spray bars of different heights through multiple regulating valves, and complete the pressure consistency adjustment of the spray bars of different heights through the regulating valves. However, when the various regulating valves are adjusted at the same time, there is mutual coupling interference of parameters, the adjustment time is long, and the parameter deviation fluctuates greatly. It is suitable for medium-sized freezing wind tunnels. 3. Use multiple water supply pressure sources to independently supply water to the spray bars of different heights, and the pressure of each spray bar is independently adjusted. The adjustment parameters are single, but the equipment is large in scale and the hardware deviation requirements of each regulating device are high. It is suitable for larger-sized freezing wind tunnels.

[0004] The above methods all require time to adjust the water supply pressure after the nozzle is turned on, and the adjustment time varies from more than ten seconds to dozens of seconds. In all of them, there is a process in which the test piece is covered by icing fog with invalid parameters for more than ten seconds to dozens of seconds. When conducting short-term icing tests, such as tens of seconds to a hundred seconds, the existence of icing fog with invalid parameters for more than ten seconds to dozens of seconds is unacceptable, so the ice wind tunnel icing test with a shorter duration is severely restricted.

[0005] Therefore, how to solve the problem in the prior art that it takes time to adjust the water supply pressure after opening the nozzle during the icing rain fog test and there are invalid icing cloud fog test parameters has become an important technical problem to be solved by technical personnel in this field. Summary of the invention

[0006] The purpose of the present invention is to provide an icing wind tunnel spray device and a water supply pressure rapid response device and method thereof to solve the technical problems in the prior art that it takes time to adjust the water supply pressure after the nozzle is turned on during the icing rain fog test, and there are invalid icing cloud fog test parameters. The various technical effects that can be produced by the preferred technical solution among the various technical solutions provided by the present invention are described in detail below.

[0007] The present invention provides a gradient tube, wherein the top end position of the gradient tube is higher than the bottom end position, and the top end side wall and the bottom end side wall of the gradient tube are respectively provided with a first pressure sensing device and a second pressure sensing device, and the cross-sectional area of ​​the gradient tube gradually decreases along the direction from the top end to the bottom end;

[0008] A water tank, the water tank is connected to the top end of the gradient tube through a first pipeline, the water tank is connected to the bottom end of the gradient tube through a second pipeline, a switch valve and a booster pump are provided on the first pipeline to pump water in the water tank into the top end of the gradient tube and make the water flow in the gradient tube, and a flow control valve is provided on the second pipeline;

[0009] A control device, which is communicatively connected with the booster pump, the first pressure sensing device, and the second pressure sensing device;

[0010] A plurality of spray assemblies are distributed along the length direction of the gradient tube, each of the spray assemblies is connected to the gradient tube, and a first valve is arranged between each of the spray assemblies and the gradient tube.

[0011] Preferably, the first pipeline includes a main pipeline, a first branch, and a second branch. One end of the main pipeline is connected to the water tank, and the other end of the main pipeline is connected to both the first branch and the second branch. The first branch is connected to the water tank, and the second branch is connected to the top of the gradient tube. The switch valve and the boost pump are both arranged on the main pipeline, and a pressure control valve is also provided on the first branch.

[0012] Preferably, the boost pump is driven by a motor, the motor is electrically connected to a frequency converter, and the frequency converter is communicatively connected to the control device.

[0013] Preferably, it also includes a purge component, which includes a purge pipeline and a second valve arranged on the purge pipeline, one end of the purge pipeline is connected to an external air source, and the other end is connected to the top end of the gradient tube.

[0014] Preferably, the gradient tube is a vertically arranged inverted cone structure.

[0015] Preferably, a flow meter is provided on the second pipeline.

[0016] Preferably, each of the spray assemblies comprises a spray rod and a plurality of nozzles arranged on the spray rod, and the nozzles are arranged along the length direction of the spray rod.

[0017] The present invention provides an icing wind tunnel spray device, comprising the above-mentioned water supply pressure rapid response device.

[0018] The present invention provides a water supply pressure response method, comprising:

[0019] Open the switch valve, adjust the openings of the pressure control valve and the flow control valve to preset values ​​respectively to connect the first pipeline and the second pipeline, and close the first valve;

[0020] Turn on the motor to make the booster pump work, and adjust the pressure control valve until the arithmetic mean of the pressure values ​​sensed by the first pressure sensing device and the second pressure sensing device is consistent with the required value of the test working condition;

[0021] The frequency converter is controlled by the control device so that the arithmetic mean of the pressure values ​​sensed by the first pressure sensing device and the second pressure sensing device is constant and equal to the required value of the test condition, and the flow control valve is adjusted until the absolute value of the difference between the first pressure sensing device and the second pressure sensing device is consistent with the allowable deviation value of the test condition;

[0022] Open the first valve and each nozzle to start the icing cloud test.

[0023] Preferably, after the icing cloud test is completed, the second valve is opened to allow the external compressed air to blow away the residual water in the nozzle and blow the water in the gradient tube into the water tank.

[0024] In the technical solution provided by the present invention, the water supply pressure rapid response device of the icing wind tunnel spray equipment includes a gradient tube, a water tank, a control device and multiple spray components, wherein the top position of the gradient tube is higher than the bottom position, and the top side wall and the bottom side wall of the gradient tube are respectively provided with a first pressure sensing device and a second pressure sensing device, and the cross-sectional area of ​​the gradient tube gradually decreases in the direction from the top to the bottom; the water tank is connected to the top of the gradient tube through a first pipeline, and the water tank is connected to the bottom of the gradient tube through a second pipeline, a switch valve and a booster pump are provided on the first pipeline, so that the water in the water tank is pumped into the top of the gradient tube and the water flows in the gradient tube, and a flow control valve is also provided on the second pipeline; the control device and the booster pump, the first pressure sensing device, and the second pressure sensing device can be communicatively connected; the spray components are distributed along the length direction of the gradient tube, and each spray component is connected to the gradient tube, and a first valve is provided between each spray component and the gradient tube.

[0025] In this way, the water in the water tank is first pumped into the gradient tube by opening the switch valve and the booster pump, and the average pressure value sensed by the first pressure sensing device and the second pressure sensing device is made consistent with the test condition requirement value by adjusting the booster pump; then, a suitable flow rate is adjusted in the gradient tube by adjusting the flow control valve. In this process, the average pressure value sensed by the first pressure sensing device and the second pressure sensing device is kept constant by the control device. Since the cross-sectional area of ​​the gradient tube gradually decreases from the top to the bottom of the gradient tube, the flow velocity of the water in this direction gradually increases, so that a flow velocity gradient from top to bottom is formed in the gradient tube. The flow velocity gradient can form a flow velocity static pressure gradient from top to bottom, and the greater the velocity, the greater the dynamic pressure, so the dynamic pressure at the bottom is greater than the dynamic pressure at the top. Since the total pressure value (total pressure value) includes the sum of the dynamic pressure and the static pressure, and the total pressure value in the gradient tube is unchanged, the static pressure of the water flow at the bottom is less than the static pressure of the water flow at the top. The gravity pressure at the bottom of the gradient tube is greater than the gravity pressure at the top, so the static pressure gradient is opposite to the gravity pressure gradient formed by the fluid medium in the gradient tube under the action of gravity. When the flow control valve is adjusted to a suitable flow rate, the velocity static pressure gradient at the top and bottom is equal to the gravity pressure gradient at the bottom and top, and they offset each other, so that the static pressure values ​​at each point in the gradient tube are consistent, that is, the consistency of regulating the water supply pressure is achieved, and finally the first valve is opened to make the spray assembly spray. With this setting, the whole process decouples the pressure regulation and flow regulation in steps, ensuring that the two parameters do not interfere with each other during the regulation process, and the water supply pressure in the gradient tube can be adjusted to be consistent before the nozzle is opened, and there are no invalid icing cloud test parameters after the nozzle is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a schematic structural diagram of a water supply pressure rapid response device in an embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of the first pipeline in an embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of a water supply pressure rapid response device in another embodiment of the present invention;

[0030] Figure 4 is a schematic structural diagram of a control device in an embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the gradient tube of the present invention.

[0032] Figure 1-5 middle:

[0033] 1. Gradient tube; 2. Water tank; 3. First pressure sensing device; 4. Second pressure sensing device; 5. First pipeline; 501. Main pipeline; 502. First branch; 503. Second branch; 6. Switch valve; 7. Booster pump; 8. Second pipeline; 9. Flow control valve; 10. Control device; 11. Motor; 12. Frequency converter; 13. Spray rod; 14. Nozzle; 15. Pressure control valve; 16. First valve; 17. Purge pipeline; 18. Second valve; 19. Flow meter; x, height difference; y, cross-sectional change rate. DETAILED DESCRIPTION

[0034] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0035] The purpose of this specific embodiment is to provide an icing wind tunnel spray device and a water supply pressure rapid response device and method thereof, so as to solve the problems in the prior art that it takes time to adjust the water supply pressure after opening the nozzle during icing rain and fog experiments, and there are invalid icing cloud and fog test parameters.

[0036] The following is an explanation of the embodiments with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the invention described in the claims. In addition, the entire contents of the configurations shown in the following embodiments are not limited to the solutions required as the invention described in the claims.

[0037] See also Figure 1-3In this embodiment, the water supply pressure quick response device of the icing wind tunnel spray equipment includes a gradient tube 1, a water tank 2, a control device 10 and a plurality of spray components. Among them, the top position of the gradient tube 1 is higher than the bottom position, and the top side wall and the bottom side wall of the gradient tube 1 are respectively provided with a first pressure sensing device 3 and a second pressure sensing device 4, and the cross-sectional area of ​​the gradient tube 1 gradually decreases in the direction from the top to the bottom. Specifically, the first pressure sensing device 3 can be a pressure sensor or a pressure gauge, which can detect the pipeline side wall pressure of the gradient tube 1, that is, detect the pipeline static pressure. The water tank 2 is connected to the top end of the gradient tube 1 through the first pipeline 5, and is connected to the bottom end of the gradient tube 1 through the second pipeline 8. The first pipeline 5 is provided with a switch valve 6 and a booster pump 7. The switch valve 6 and the booster pump 7 can be used to pump water in the water tank 2 into the top end of the gradient tube 1 and allow the water to flow in the gradient tube 1, thereby generating water pressure in the gradient tube 1. The first pressure sensing device 3 and the second pressure sensing device 4 will also display the pressure values ​​at the top and bottom ends of the gradient tube 1 accordingly. By adjusting the booster pump 7, the values ​​displayed by the first pressure sensing device 3 and the second pressure sensing device 4 will also change. The second pipeline 8 is also provided with a flow control valve 9, and the flow rate in the gradient tube 1 can be adjusted by the flow control valve 9. The control device 10 can be communicatively connected with the boost pump 7, the first pressure sensing device 3, and the second pressure sensing device 4; the spray components are distributed along the length direction of the gradient tube 1, and each spray component is connected to the gradient tube 1, and a first valve 16 is provided between each spray component and the gradient tube 1. When fluid flows in the gradient tube 1, the first valve 16 is opened and the fluid can be sprayed out through the spray component.

[0038] Specifically, the water in the water tank 2 is pumped into the gradient tube 1 by opening the switch valve 6 and the booster pump 7, and the average value of the pressure sensed by the first pressure sensing device 3 and the second pressure sensing device 4 is made consistent with the required value of the test condition by adjusting the booster pump 7; then, a suitable flow is adjusted in the gradient tube 1 by adjusting the flow control valve 9. In this process, the average value of the pressure sensed by the first pressure sensing device 3 and the second pressure sensing device 4 is kept constant by the control device 10. Since the cross-sectional area of ​​the gradient tube 1 gradually decreases from the top to the bottom of the gradient tube 1, the flow velocity of the water in this direction gradually increases, so that a flow velocity gradient from top to bottom is formed in the gradient tube 1, and the flow velocity gradient can form a flow velocity static pressure gradient from top to bottom. The total pressure value (total pressure value) includes the sum of dynamic pressure and static pressure. The total pressure value in the gradient tube 1 remains unchanged (without considering gravity pressure). According to the dynamic pressure formula 0.5ρ·ν·ν (ρ is the fluid density, ν is the fluid velocity), it can be concluded that the greater the velocity, the greater the dynamic pressure. Therefore, the dynamic pressure at the bottom is greater than the dynamic pressure at the top, and the flow velocity static pressure at the bottom is less than the flow velocity static pressure at the top. According to the gravity pressure formula ρ·g·h (h is the height), it can be obtained that the gravity pressure at the bottom of the gradient tube 1 is greater than the gravity pressure at the top. Therefore, the static pressure gradient is opposite to the gravity pressure gradient formed by the fluid medium in the gradient tube 1 under the action of gravity. When the flow control valve 9 is adjusted to a suitable flow rate, the flow velocity static pressure gradient values ​​at the top and bottom are equal to the gravity pressure gradient values ​​at the bottom and top, and they offset each other. The pressure detected by the first pressure sensing device 3 and the second pressure sensing device 4 is the actual static pressure of the side wall of the pipeline, that is, the sum of the static pressure of the flow rate and the gravity pressure. Therefore, at this time, the static pressure values ​​of each point in the gradient tube 1 are consistent, and the values ​​of the first pressure sensing value and the second pressure sensing value tend to be equal, thereby achieving the consistency of regulating the water supply pressure. Finally, the first valve 16 is opened to allow the spray assembly to spray.

[0039] With such an arrangement, the whole process decouples the pressure regulation and flow regulation in steps, ensuring that the two parameters do not interfere with each other during the regulation process, and the water supply pressure in the gradient tube 1 can be quickly adjusted to be consistent before the nozzle 14 is turned on. After the nozzle 14 is turned on, there are no invalid icing cloud test parameters, which further simplifies the test method of the icing wind tunnel and further expands the test scope. Moreover, the principle of the device is simple, the equipment composition structure is not complicated, there are no special parts, no standard parts, it is easy to process and realize, and the implementation cost is low. The device responds quickly, the invalid cloud time is extremely short, the system works stably, and the test parameters are reliable. On the whole, it has a simple composition, a single parameter adjustment, stable and reliable operation, a high degree of automation, and good safety.

[0040] As an optional implementation, Figure 1-2As shown, the first pipeline 5 includes a main pipeline 501, a first branch 502, and a second branch 503. One end of the main pipeline 501 is connected to the water tank 2, and the other end of the main pipeline 501 is connected to the first branch 502 and the second branch 503. The first branch 502 is connected to the water tank 2, and the second branch 503 is connected to the top of the gradient tube 1. The switch valve 6 and the boost pump 7 are both arranged on the main pipeline 501, and a pressure control valve 15 is also provided on the first branch 502. Specifically, the three pipelines of the main pipeline 501, the first branch 502, and the second branch 503 are connected by a tee, and the pressure control valve 15 controls the flow and pressure of the first branch 502 from itself to the tee; the flow and pressure of the main pipeline 501 can reach a certain value through the boost pump 7 and the switch valve 6, and the pressure of the first branch 502 can be directly controlled by the pressure control valve 15, so adjusting the pressure control valve 15 is equivalent to indirectly controlling the pressure of the second branch 503, that is, the pressure at the top of the gradient tube 1; in addition, the first branch 502 can be diverted by the pressure control valve 15, so that the flow in the second branch 503 is less than the minimum flow of the main pipeline 501. If the first branch 502 is not provided, the flow of the second branch 503 can only be equal to the flow of the main pipeline 501.

[0041] With such arrangement, the top pressure of the gradient tube 1 can be adjusted through the two branches, and the working range of the booster pump 7 is extended, and the flow range that can be adjusted by the second branch 503 is expanded.

[0042] As an optional implementation, Figure 4As shown, the booster pump 7 is driven by the motor 11, and the motor 11 is electrically connected to the frequency converter 12, and the frequency converter 12 can be connected to the control device 10 in communication. The frequency converter 12 can change the working power frequency of the motor 11, thereby changing the speed of the booster pump 7 to change the size of the water supply pressure, which is equivalent to a variable frequency constant pressure water supply system. The variable frequency constant pressure water supply system is a special variable frequency speed control system developed by using pumps to control flow and pressure. Specifically, the variable frequency constant pressure water supply system uses a potentiometer to set the pressure, and uses a pressure sensor to detect the pressure in the pipe network. The pressure sensor sends the signal to the PID loop of the frequency converter 12. After the PID loop is processed, a water increase or decrease signal is sent to control the speed of the motor 11. When the water supply flow rate of the booster pump 7 and the water use flow rate are in a balanced state, the water supply pressure is stable at the set value and does not change. At this time, the water supply pressure measurement signal (feedback signal) is basically equal to the given signal (target signal), and the booster pump 7 operates at a certain frequency output by the frequency converter 12. When the water flow rate increases, the water supply pressure will decrease, and the water supply pressure measurement signal (feedback signal) will decrease, and the difference between the set value and the water supply pressure measurement signal will increase, and the built-in PID of the frequency converter 12 will generate a positive control amount, resulting in an increase in the output frequency of the frequency converter 12, an increase in the speed of the motor 11, an increase in the water supply flow of the booster pump 7, and an increase in the water supply pressure, so that it returns to the given value (target value), and the system is in a balanced state. On the other hand, a decrease in the water flow rate will cause the water supply flow of the booster pump 7 to be greater than the water flow rate, the water supply pressure will increase, and the water supply pressure measurement signal (feedback signal) will increase, so that the difference between the set value and the water supply pressure measurement signal will decrease, and the built-in PID of the frequency converter 12 will generate a negative control amount, resulting in a decrease in the output frequency of the frequency converter 12, a decrease in the speed of the motor 11, a decrease in the water supply flow of the booster pump 7, and a decrease in the water pressure, so that it returns to the given value (target value), and the system is in a balanced state. This corresponds to the above-mentioned process of keeping the average value of the pressure values ​​sensed by the first pressure sensing device 3 and the second pressure sensing device 4 constant through the control device 10.

[0043] In this solution, the pressure sensor is usually a pressure transmitter or a remote pressure gauge, and the frequency converter uses the ABB frequency converter ACS510 series. This type of frequency converter 12 has a control panel, which can automatically reduce or increase the motor speed when automatically performing PID control, and plays the role of the control device 10.

[0044] As an optional embodiment, the gradient tube 1 is a vertically arranged inverted cone structure. Specifically, the gradient tube 1 is not a very regular inverted cone structure, such as Figure 5As shown, along the axial direction from top to bottom of the gradient tube 1, the cross-sectional change rate of the gradient tube 1 presents a quadratic curve, i.e., a parabolic trend with the opening upward, wherein the variable x is the distance or height difference between a certain position of the gradient tube 1 and the top of the gradient tube 1, and the dependent variable y is the cross-sectional change rate of the gradient tube 1, and the gradient tube 1 presents a trend of gradual contraction from top to bottom. In addition, the water consumption of the spray array is directly related to the static pressure of the flow velocity. The greater the static pressure of the flow velocity, the greater the water consumption, and the cross-sectional change rate also affects the static pressure of the flow velocity, so the cross-sectional change rate is also indirectly affected by the water consumption of the spray assembly.

[0045] In a preferred embodiment, a flow meter 19 is provided on the second pipeline 8 , which can detect the flow rate of the second pipeline 8 , which is equivalent to detecting the flow rate in the gradient tube 1 .

[0046] In a preferred embodiment, each spray assembly includes a spray rod 13 and a plurality of nozzles 14, wherein the nozzles 14 are arranged along the length direction of the spray rod 13, and the nozzles 14 on the same spray rod 13 are arranged at intervals, and a first valve 16 is provided between each spray rod 13 and the gradient tube 1, and the spray rod 13 and the gradient tube 1 can be connected or not by opening and closing the first valve 16. Specifically, the first valve 16 can be a solenoid valve, and the opening and closing of each first valve 16 can be automatically controlled by the control device 10, and of course, it can also be manually controlled to open and close.

[0047] With such arrangement, when the bottom pressure value and the top pressure value of the gradient tube 1 are adjusted to be consistent and run stably, all the first valves 16 are opened, and each nozzle 14 is instantly operated at the same specified spray water supply pressure to form an effective icing cloud.

[0048] In a preferred embodiment, the water supply pressure rapid response device also includes a purge assembly. When the spray assembly is finished working, the purge assembly is used to clear out the fluid in each nozzle 14, the gradient tube 1 and the pipeline to prepare for the next use. Specifically, the purge assembly includes a purge pipeline 17 and a second valve 18. The second valve 18 is arranged on the purge pipeline 17. One end of the purge pipeline 17 is connected to an external air source, and the other end is connected to the top of the gradient tube 1. Optionally, the external air source can be an air compressor, or a gas storage tank or other device that can provide compressed gas. The second valve 18 can also use a solenoid valve, and the opening and closing of the second valve 18 can also be automatically controlled by the control device 10. Of course, the opening and closing of the second valve 18 can also be manually controlled.

[0049] With such arrangement, when the spray assembly is completed, that is, after the icing cloud test is over, the second valve 18 is opened to allow the compressed gas provided by the external gas source to circulate in the purge pipeline 17 and flow into the nozzle 14, the gradient tube 1 and the second pipeline 8, so as to clean the residual water in the nozzle 14 and clear the remaining fluid in the gradient tube 1 back into the water tank 2, which is equivalent to the role of the scavenging fluid, so that the system returns to its original state and prepares for the pressure debugging process of the next icing cloud test.

[0050] The water supply pressure rapid response device is specifically described in combination with the above-mentioned embodiments. In this embodiment, the water supply pressure rapid response device includes a gradient tube 1 with an inverted cone structure, a water tank 2, a control device 10, a spray rod 13, a plurality of nozzles 14 arranged on the spray rod 13, and a purge assembly. The top end position of the gradient tube 1 is higher than the bottom end position, and the top end side wall and the bottom end side wall of the gradient tube 1 are respectively provided with a first pressure sensor and a second pressure sensor. In the direction from the top end to the bottom end, the cross-sectional area of ​​the gradient tube 1 gradually decreases; the water tank 2 is connected to the top end of the gradient tube 1 through a first pipeline 5, and the first pipeline 5 includes a main pipeline 501, a first branch pipeline 502 and a second branch pipeline 503. Branch 503, one end of the main pipeline 501, the first branch 502 and the water tank 2 are all connected, the other end of the main pipeline 501 is connected to the first branch 502 and the second branch 503, the second branch 503 is connected to the top of the gradient tube 1, the main pipeline 501 is provided with a switch valve 6 and a boost pump 7, the boost pump 7 is driven by a motor 11, the motor 11 is electrically connected to a frequency converter 12, and the first branch 502 is provided with a pressure control valve 15, so that the water in the water tank 2 is pumped into the top of the gradient tube 1 and the water flows in the gradient tube 1; the water tank 2 is connected to the bottom end of the gradient tube 1 through the second pipeline 8, and the second pipeline 8 is also provided with a flow control valve 9 and a flow meter 19. The control device 10 can be connected to the frequency converter 12, the first pressure sensor, and the second pressure sensor in communication; the number of spray rods 13 is multiple and distributed along the length of the gradient tube 1, each spray rod 13 is provided with multiple nozzles 14, each spray rod 13 is connected to the gradient tube 1, and a first solenoid valve is provided between each spray rod 13 and the gradient tube 1. The purge assembly includes a purge pipeline 17 and a second solenoid valve provided on the purge pipeline 17, one end of the purge pipeline 17 is connected to an external air source, and the other end is connected to the top of the gradient tube 1.

[0051] The present invention provides an icing wind tunnel spray device, including the water supply pressure rapid response device in the above embodiment. With such a configuration, the water supply pressure rapid response device of the icing wind tunnel spray device decouples the pressure regulation and the flow regulation in steps, and the two parameters do not interfere with each other during the regulation process, and the water supply pressure in the gradient tube 1 can be adjusted to be consistent before the nozzle 14 is turned on, and there are no invalid icing cloud test parameters after the nozzle 14 is turned on. The derivation process of this beneficial effect is the same as the derivation process of the beneficial effect of the water supply pressure rapid response device, and will not be repeated in detail here.

[0052] The present invention also provides a water supply pressure response method, comprising:

[0053] In the first step, the switch valve 6 is opened, the openings of the pressure control valve 15 and the flow control valve 9 are adjusted to preset values ​​respectively to connect the first pipeline 5 and the second pipeline 8, and the first valve 16 is closed. Specifically, the openings of the pressure control valve 15 and the flow control valve 9 are usually 50%, so that the fluid can flow in the first pipeline 5 and the second pipeline 8 in the later stage, avoiding the pipeline being in an empty pipe state. Preferably, the first valve 16 is a solenoid valve.

[0054] In the second step, the motor 11 is turned on to make the boost pump 7 work, and the pressure control valve 15 is adjusted until the arithmetic mean of the pressure values ​​sensed by the first pressure sensing device 3 and the second pressure sensing device 4 is consistent with the required value of the test condition. Preferably, the first pressure sensing device 3 and the second pressure sensing device 4 are the first pressure sensor and the second pressure sensor, respectively.

[0055] Specifically, the booster pump 7 starts to work. After the booster pump 7 draws water from the water tank 2 and boosts the pressure, the water flows through the main pipeline 501 and is divided into two branches, namely the first branch 502 and the second branch 503. The first branch 502 transports the water back to the water tank 2, and the second branch 503 transports the water to the top of the gradient tube 1, so that the water starts to flow in the gradient tube 1. When the working frequency of the booster pump 7 is fixed, the pressure and flow of the main pipeline 501 are constant. By adjusting the pressure control valve 15, the pressure and flow of the first branch 502 can be adjusted, thereby indirectly adjusting the pressure and flow of the second branch 503, that is, the pressure value at the top of the gradient tube 1. The bottom of the gradient tube 1 must withstand the water pressure, so there is always a gravity pressure difference between the bottom of the gradient tube 1 and the top of the gradient tube 1. At this time, the pressure at the bottom of the gradient tube 1 sensed by the second pressure sensing device 4 is greater than the pressure at the top of the gradient tube 1 sensed by the first pressure sensing device 3. By adjusting the pressure control valve 15 and the booster pump 7, the average pressure sensed by the first pressure sensing device 3 and the second pressure sensing device 4 can reach the required value of the test condition. For example, if the required value of the test condition is 20P, if the display values ​​of the first pressure sensing device 3 and the second pressure sensing device 4 reach 10P and 30P respectively, the required value of the test condition is reached at this time.

[0056] In the third step, the frequency converter 12 is controlled by the control device 10 so that the arithmetic mean of the pressure values ​​sensed by the first pressure sensing device 3 and the second pressure sensing device 4 is constant and equal to the required value of the test condition, and the flow control valve 9 is adjusted until the absolute value of the value difference between the two pressure sensing devices is consistent with the allowable deviation value of the test condition.

[0057] Specifically, since the gravity pressure difference is to be eliminated in the gradient tube 1, the pressure values ​​sensed by the first pressure sensing device 3 and the second pressure sensing device 4 are to be made equal. Adjusting the flow control valve 9 is equivalent to adjusting the flow in the second pipeline 8 and the gradient tube 1, and the cross-sectional area of ​​the top end of the gradient tube 1 is larger than that of the bottom end. Therefore, under the condition of the same flow rate, the flow velocity at the bottom end of the gradient tube 1 is greater than that at the top end. According to the dynamic pressure formula 0.5ρ·ν·ν (ρ is the fluid density, ν is the fluid velocity), it can be concluded that the greater the flow velocity, the greater the dynamic pressure. Therefore, the dynamic pressure at the bottom end of the gradient tube 1 is greater than the dynamic pressure at the top end, and the total pressure value in the gradient tube 1 remains unchanged, then the flow velocity static pressure at the bottom end is less than the flow velocity static pressure at the top end. Therefore, the pressure value of the second pressure sensing device 4 gradually decreases, and the pressure value of the first pressure sensing device 3 gradually increases until the two values ​​tend to be equal. For example, the test condition demand value is 20P, and the display values ​​of the first pressure sensing device 3 and the second pressure sensing device 4 reach 19P and 21P respectively. The absolute difference meets the allowable deviation value of the test condition, which also shows that the pressure has reached a consistent adjustment state. If the average value of the two displayed values ​​changes during this process, the control device 10 controls the frequency converter 12, and indirectly controls the motor 11 and the boost pump 7, so that the water suction boost pressure is appropriately increased or decreased, so that the average value of the two displayed values ​​returns to the initial state, that is, it is always equal to the required value of the test condition.

[0058] In the fourth step, the pressure has been adjusted in the previous step, and the first valve 16 and each nozzle 14 are opened to start the icing cloud test. The flow rate in the gradient tube 1 is much greater than the flow rate of water consumed by the nozzle 14. Therefore, after the first valve 16 is opened, the display values ​​of the first pressure sensing device 3 and the second pressure sensing device 4 change very little, and there is no need to adjust other valves. Each nozzle 14 can complete the cloud generation under the condition that the water supply parameters are consistent with the test conditions.

[0059] With such arrangement, the whole process decouples pressure regulation and flow regulation in steps, ensuring that the two parameters do not interfere with each other during the regulation process, and the water supply pressure in the gradient tube 1 can be quickly adjusted to be consistent before the nozzle 14 is opened. The effective parameters of the cloud and mist test respond quickly, the test can be started immediately, and the test structure has high reliability.

[0060] In a preferred embodiment, after the icing cloud test is completed, the second valve 18 is opened to allow external compressed air to flow into the purge pipe 17 and purge the residual water in the nozzle 14, and the water in the gradient tube 1 is pushed into the water tank 2. The pressurized gas is equivalent to the effect of the purge water, so that the gradient tube 1 returns to its original state, preparing for the pressure debugging process of the next icing cloud test, otherwise it will affect the next debugging work.

[0061] It is understood that the same or similar parts in the above embodiments can refer to each other, and the content not described in detail in some embodiments can refer to the same or similar content in other embodiments. The multiple solutions provided by the present invention include the basic solution itself, which are independent of each other and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects together.

[0062] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A quick response device for water supply pressure of an icing wind tunnel spray equipment. It is characterized in that include: A gradient tube (1), wherein the top end of the gradient tube (1) is higher than the bottom end, and the top end side wall and the bottom end side wall of the gradient tube (1) are respectively provided with a first pressure sensing device (3) and a second pressure sensing device (4), and the cross-sectional area of ​​the gradient tube (1) gradually decreases along the direction from the top end to the bottom end, and the gradient tube (1) is a vertically arranged inverted cone structure, and along the axial direction from top to bottom of the gradient tube (1), the cross-sectional change rate of the gradient tube (1) presents a quadratic curve, that is, a parabolic trend with the opening upward; A water tank (2), the water tank (2) being connected to the top end of the gradient tube (1) via a first pipeline (5), the water tank (2) being connected to the bottom end of the gradient tube (1) via a second pipeline (8), the first pipeline (5) being provided with a switch valve (6) and a booster pump (7) for pumping water in the water tank (2) into the top end of the gradient tube (1) and allowing the water to flow in the gradient tube (1), the second pipeline (8) being provided with a flow control valve (9); A control device (10) capable of being communicatively connected to the booster pump (7), the first pressure sensing device (3), and the second pressure sensing device (4); A plurality of spray assemblies are distributed along the length direction of the gradient tube (1), each of the spray assemblies is connected to the gradient tube (1), and a first valve (16) is provided between each of the spray assemblies and the gradient tube (1).

2. The water supply pressure quick response device according to claim 1, It is characterized in that The first pipeline (5) comprises a main pipeline (501), a first branch (502), and a second branch (503); one end of the main pipeline (501) is connected to the water tank (2); the other end of the main pipeline (501) is connected to both the first branch (502) and the second branch (503); the first branch (502) is connected to the water tank (2); the second branch (503) is connected to the top end of the gradient tube (1); the switch valve (6) and the booster pump (7) are both arranged on the main pipeline (501); and a pressure control valve (15) is also arranged on the first branch (502).

3. The water supply pressure quick response device according to claim 2, It is characterized in that The boost pump (7) is driven by a motor (11), the motor (11) is electrically connected to a frequency converter (12), and the frequency converter (12) is communicatively connected to the control device (10).

4. The water supply pressure quick response device according to claim 3, It is characterized in that It also comprises a purge assembly, the purge assembly comprising a purge pipeline (17) and a second valve (18) arranged on the purge pipeline (17), one end of the purge pipeline (17) being connected to an external gas source, and the other end of the purge pipeline (17) being connected to the top end of the gradient tube (1).

5. The water supply pressure quick response device according to claim 1, It is characterized in that The second pipeline (8) is provided with a flow meter (19).

6. The water supply pressure quick response device according to claim 4, It is characterized in that Each of the spray assemblies comprises a spray rod (13) and a plurality of nozzles (14) arranged on the spray rod (13), wherein the nozzles (14) are arranged along the length direction of the spray rod (13).

7. An icing wind tunnel spray device, It is characterized in that It comprises a water supply pressure rapid response device, and the water supply pressure rapid response device is the water supply pressure rapid response device as described in any one of claims 1-6.

8. A water supply pressure response method based on the water supply pressure rapid response device according to claim 6, It is characterized in that include: Opening the switch valve (6), adjusting the openings of the pressure control valve (15) and the flow control valve (9) to preset values ​​respectively, so as to connect the first pipeline (5) and the second pipeline (8), and closing the first valve (16); Turning on the motor (11) to operate the booster pump (7), and adjusting the pressure control valve (15) until the arithmetic mean of the pressure values ​​sensed by the first pressure sensing device (3) and the second pressure sensing device (4) is consistent with the required value of the test working condition; The frequency converter (12) is controlled by the control device (10) so that the arithmetic mean of the pressure values ​​sensed by the first pressure sensing device (3) and the second pressure sensing device (4) is kept constant and equal to the required value of the test condition, and the flow control valve (9) is adjusted until the absolute value of the difference between the value of the first pressure sensing device (3) and the value of the second pressure sensing device (4) is consistent with the allowable deviation value of the test condition; The first valve (16) and each nozzle (14) are opened to start the icing cloud test.

9. The water supply pressure response method according to claim 8, It is characterized in that After the icing cloud test is completed, the second valve (18) is opened to allow the external compressed air to blow away the residual water in the nozzle (14) and at the same time blow the water in the gradient tube (1) into the water tank (2).

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