Large water drop and cloud generating system

Abstract

The invention provides a large water drop and mist generation system. The large water drop and mist generation system comprises a mist generation system, a large water drop generation system, a water source pipeline and an air source pipeline, the cloud and mist generation system is used for generating cloud and mist meeting a preset cloud and mist standard; the large water drop generating system is located above the cloud and mist generating system and comprises a movable sliding rail, a position control system and a large water drop generating device, and the large water drop generating system is used for generating large water drops meeting the preset large water drop standard; the water source pipeline is used for providing a water source meeting preset indexes; the gas source pipeline is used for providing a gas source meeting preset indexes. The problems that the cloud and mist nozzle range in a traditional horizontal icing wind tunnel is limited, cloud and mist cannot present water drop particle size bimodal distribution, and the uniformity of large water drops is poor can be solved, the combined cloud and mist environment meeting the requirement of airworthiness clause appendix O for mass distribution is achieved, and the method is suitable for productive icing wind tunnel tests. And powerful technical support is provided for large aircrafts to walk out of the country gate.

Description

Technical Field

[0001] The present application relates to the technical field of wind tunnel testing, and in particular to a large water droplet and cloud generation system. Background Art

[0002] Wind tunnel testing is an experimental method used to simulate wind in an atmospheric environment. It simulates wind of different speeds and directions by generating airflow in a closed test chamber in order to study the behavior and performance of objects in the wind. Wind tunnel testing is commonly used in aerospace, automotive engineering, architectural design and other fields. In the field of aerospace, wind tunnel testing can be used to test the aerodynamic performance of aircraft, rockets, drones and other aircraft, including lift, drag, aerodynamic stability, etc. The advantages of wind tunnel testing include the ability to control experimental conditions, good repeatability, and the ability to provide detailed aerodynamic performance data. However, wind tunnel testing also has some limitations, such as the limited range of cloud nozzles in traditional horizontal ice wind tunnels, the inability of cloud particle size to present a bimodal distribution characteristic, poor large water droplet tracking, and poor spatial uniformity. Summary of the invention

[0003] The present application provides a large water droplet and cloud generation system to solve the problems of limited range of cloud nozzles in traditional horizontal ice wind tunnels, inability of cloud particle size to present bimodal distribution characteristics, poor large water droplet tracking and poor spatial uniformity.

[0004] The present application provides a large water droplet and cloud generation system, comprising:

[0005] A cloud generation system, used to generate clouds and fog that meet preset cloud and fog standards;

[0006] A large water droplet generating system is located above the cloud generation system and is used to generate large water droplets that meet preset large water droplet standards; the large water droplet generating system includes a meshed movable slide rail, a position control system connected to the movable slide rail, and a large water droplet generating device disposed at a connection point of the movable slide rail, wherein the position control system is used to change the connection point position of the movable slide rail, thereby changing the position of the large water droplet generating device, and adjusting the spatial uniformity of the large water droplets generated by the large water droplet generating device;

[0007] A water source pipeline, connected to the cloud generation system and the large water drop generation system, for providing a water source that meets preset indicators;

[0008] The gas source pipeline is connected to the cloud generation system and is used to provide a gas source that meets preset indicators.

[0009] Preferably, the preset cloud standards include preset water content, particle size and spatial uniformity of the cloud.

[0010] Preferably, the preset large water droplet standard includes the preset water content, frequency, flow rate, particle size and spatial uniformity of the large water droplets.

[0011] Preferably, the large water droplet generating system also includes a large water droplet generating device control system which is connected in sequence to the large water droplet generating device; the water source pipeline includes a first water source pipeline; the first water source pipeline is connected to the large water droplet generating device control system; the large water droplet generating device control system is used to adjust the flow rate and frequency of the first water source pipeline, thereby adjusting the water content of the large water droplets generated by the large water droplet generating device; the first water source pipeline is used to provide a water source that meets a first preset water source indicator.

[0012] Preferably, the mist generating system includes a spray rake, a mist generating nozzle arranged on the spray rake and a nozzle control system connected to the mist generating nozzle, the nozzle control system is used to control the opening and closing state of the mist generating nozzle, and adjust the water content and spatial uniformity of the mist generated by the mist generating nozzle; the water source pipeline includes a second water source pipeline; the nozzle control system is respectively connected to the second water source pipeline and the air source pipeline; the second water source pipeline is used to provide a water source that meets a second preset water source index; the air source pipeline is used to provide an air source that meets a preset air source index.

[0013] Preferably, a water supply pressure regulator is provided between the nozzle control system and the second water source pipeline, and the water supply pressure regulator is used to adjust the water pressure of the second water source pipeline.

[0014] Preferably, a water supply switch for controlling the opening and closing of the water supply pressure regulator is provided in the water supply pressure regulator.

[0015] Preferably, an air supply pressure regulator is provided between the nozzle control system and the air source pipeline, and the air supply pressure regulator is used to adjust the air pressure of the air source pipeline.

[0016] Preferably, the gas supply pressure regulator is provided with a gas supply switch for controlling the opening and closing of the gas supply pressure regulator.

[0017] The large water droplet and cloud generation system provided by the present application includes a cloud generation system, a large water droplet generation system, a water source pipeline and an air source pipeline. The cloud generation system is used to generate clouds and fog that meet the preset cloud standards. The large water droplet generation system located above the cloud generation system includes a meshed mobile slide rail, a position control system connected to the mobile slide rail and a large water droplet generation device arranged at the connection point of the mobile slide rail. The position control system is used to change the connection point position of the mobile slide rail, thereby changing the position of the large water droplet generation device, and adjusting the spatial uniformity of the large water droplets generated by the large water droplet generation device. The large water droplet generation system is used to generate large water droplets that meet the preset large water droplet standards. The present application can solve the problems of limited range of cloud and fog nozzles in traditional horizontal ice wind tunnels, inability of cloud and fog particle size to present bimodal distribution characteristics, poor large water droplet followability and poor spatial uniformity, and realize a combined cloud and fog environment that meets the mass distribution requirements of Appendix O of the airworthiness clause, is suitable for production ice wind tunnel tests, and provides strong technical support for large aircraft to go abroad. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a structural schematic diagram of a large water droplet and cloud generation system provided in an embodiment of the present application;

[0020] Figure 2 It is a structural schematic diagram of a large water droplet and cloud generation system provided in an embodiment of the present application;

[0021] Figure 3 This is a working flow chart of the large water droplet and cloud generation system provided in the embodiment of the present application;

[0022] Figure 4 is a schematic diagram of a large water droplet and cloud generation system provided in an embodiment of the present application;

[0023] Figure 5 It is the water droplet size distribution curve of light freezing rain recorded in Appendix O of CS25;

[0024] Figure 6 It is the water droplet size distribution curve of freezing rain recorded in Appendix O of CS25.

[0025] Explanation of symbols:

[0026] 1. Mist generating system; 11. Spray rake; 12. Mist generating nozzle; 13. Nozzle control system; 14. Water supply pressure regulator; 15. Air supply pressure regulator; 2. Large water drop generating system; 21. Moving slide rail; 22. Position control system; 23. Large water drop generating device; 24. Large water drop generating device control system; 3. Water source pipeline; 31. First water source pipeline; 32. Second water source pipeline; 4. Air source pipeline. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0029] like Figures 1 to 4 As shown, an embodiment of the present application provides a large water droplet and cloud generation system, which is arranged in a stable section of a wind tunnel and includes:

[0030] A mist generating system 1; the mist generating system 1 comprises a spray rake 11, a mist generating nozzle 12, a nozzle control system 13, a water supply pressure regulator 14 and an air supply pressure regulator 15; the mist generating nozzle 12 is arranged on the spray rake 11; the nozzle control system 13 is connected to the mist generating nozzle 12;

[0031] A large water droplet generating system 2 is located above the cloud generating system 1; the large water droplet generating system 2 comprises a meshed movable slide rail 21, a position control system 22 connected to the movable slide rail 21, a large water droplet generating device 23 arranged at a connection point of the movable slide rail 21, and a large water droplet generating device control system 24 sequentially connected to the large water droplet generating device 23;

[0032] A water source pipeline 3 is connected to the cloud generation system and the large water drop generation system 2; the water source pipeline 3 includes a first water source pipeline 31 and a second water source pipeline 32;

[0033] A gas source pipeline 4 connected to the cloud generation system 1;

[0034] The large water droplet generating device control system 24 is connected to the first water source pipeline 31; one end of the nozzle control system 13 is connected to the water supply pressure regulator 14 and the second water source pipeline 32 in sequence, and the other end is connected to the air supply pressure regulator 15 and the air source pipeline 4 in sequence.

[0035] The water source pipeline 3 is used to provide a water source that meets the preset index, the first water source pipeline 31 is used to provide a water source that meets the first preset water source index, and the second water source pipeline 32 is used to provide a water source that meets the second preset water source index. The air source pipeline 4 is used to provide an air source that meets the preset index. The large water droplet generating system is used to generate large water droplets that meet the preset large water droplet standards; the position control system 22 is used to change the contact position of the movable slide rail 21, thereby changing the position of the large water droplet generating device 23, and adjusting the spatial uniformity of the large water droplets generated by the large water droplet generating device 23; the large water droplet generating device control system 24 is used to adjust the flow rate and frequency of the first water source pipeline 31, thereby adjusting the water content of the large water droplets generated by the large water droplet generating device 23. The cloud mist generating system 1 is used to generate clouds that meet preset cloud mist standards; the nozzle control system 13 is used to control the opening and closing state of the cloud mist generating nozzle 12, and adjust the water content and spatial uniformity of the clouds generated by the cloud mist generating nozzle 12; the air source pipeline 4 is used to provide an air source that meets preset air source indicators; the air supply pressure regulator 15 is used to adjust the air pressure of the air source pipeline 4; the water supply pressure regulator 14 is used to adjust the water pressure of the second water source pipeline 32.

[0036] Preferably, the preset cloud standards include preset water content, particle size and spatial uniformity of the cloud.

[0037] Preferably, the preset large water droplet standard includes the preset water content, frequency, flow rate, particle size and spatial uniformity of the large water droplets.

[0038] Preferably, the water supply pressure regulator 14 is provided with a water supply switch for controlling the opening and closing of the water supply pressure regulator 414. When the water supply switch is fully opened, the water pressure is at maximum, and when the water supply switch is fully closed, there is no water source.

[0039] Preferably, the gas supply pressure regulator 15 is provided with a gas supply switch for controlling the opening and closing of the gas supply pressure regulator 415. When the gas supply switch is fully opened, the maximum gas pressure is obtained, and when the gas supply switch is fully closed, there is no gas source.

[0040] The water supply pressure regulator 14 / air supply pressure regulator 15 is respectively provided with a total water pressure / air pressure switch, and a water pressure / air pressure switch corresponding to each mist generating nozzle 12. When the water pressure / air pressure of the generated mist is too high, the water pressure / air pressure switch corresponding to the mist generating nozzle 12 is adjusted down a little. The maximum degree to which the water pressure / air pressure switch is opened represents the maximum water pressure / air pressure that the system is capable of. By adjusting the water pressure and air pressure of each mist generating nozzle 12 to generate mist, the particle size of the mist generated by the mist generating nozzle 12 can be adjusted. By adjusting the particle size of the mist generated by multiple mist generating nozzles 12 through multiple iterations, the particle size requirement of the preset mist can be met.

[0041] like Figure 5 and Figure 6 As shown, according to Appendix O of "Certification Specifications and Acceptable Means of Compliance for Large Aeroplanes" (CS25) issued by the European Union Aviation Safety Agency (EASA), the maximum droplet size of light freezing rain is 100-500 microns, and the maximum droplet size of freezing rain is greater than 500 microns. It can be understood that both light freezing rain and freezing rain are combined clouds and fog with particle sizes within a certain range (i.e., a combination of clouds and fog and large water droplets), rather than clouds and fog or large water droplets of a single particle size, and the particle size of the combined clouds and fog is a bimodal distribution. Referring to the water droplet size distribution curve and the water content requirements, the parameter requirements that the preset cloud and fog standards and the preset large water droplet standards must meet are determined.

[0042] According to the cumulative mass distribution results of SLD combined clouds and fog in Appendix O, the number N and frequency F of large water droplets and clouds of various particle sizes are calculated, that is, the particle quantity statistics:

[0043] N i *F i =[N1*F1,N2*F2,N3*F3...]

[0044] Combined with the characteristic parameters of the cloud generation nozzle and the large water droplet generation device on the current market, the particle size boundary D0 of the large and small water droplets generated in the combined generation system is determined:

[0045] The cloud generating nozzle 12 generates: water droplets with a particle size of ≤D0μm

[0046] Large water droplet generating device 23 generates water droplets with a particle size of >D0μm

[0047] Based on the above results and parameters such as the wind tunnel contraction ratio and the test section size, the size of the spray rake 11, the spatial arrangement D of the cloud generating nozzle 12 and the large water droplet generating device 23 are determined.

[0048] D n =[n1(X1,Y1),n2(X1,Y1)...]

[0049] D m =[m1(X1,Y1),m2(X1,Y1)...]

[0050] Among them, D n D is the spatial arrangement of the mist generating nozzles 12, and each vertical and horizontal row has n mist generating nozzles 12; m It is the spatial arrangement of the large water droplet generating device 23, and there are m large water droplet generating devices 23 in each vertical and horizontal column; n1, n2, etc. represent different types of cloud generating nozzles 12, m1, m2, etc. represent different types of large water droplet generating devices 23, and (X, Y) represent the spatial position coordinates.

[0051] The large water droplet generating device control system 24 has a general switch and switches corresponding to each large water droplet generating device 23. When the flow rate or particle size of the water droplets is too large, the switch corresponding to each large water droplet generating device 23 is adjusted to a smaller value. When the switch is completely closed, the flow rate / particle size of the large water droplets is 0; when the switch is opened to the maximum, the flow rate / particle size is the maximum state of the device's capability.

[0052] The nozzle control system 13 is used to adjust the ON / OFF, water pressure Pw, air pressure Pa and other related parameters of the cloud generating nozzle 12 of each model; the large water droplet generating device control system 24 is used to adjust the frequency f, flow rate Q and particle size D of each large water droplet generating device 23. d Through multiple debugging and calibration, the combined cloud (i.e., the combination of large water droplets and cloud) meets the requirements of water content, particle size distribution, etc. required by the test. The relative position of the large water droplet generating device 23 in the moving slide rail 21 is adjusted by the position control system 22, so that the generated large water droplets meet the requirements of spatial uniformity.

[0053] In one embodiment, when detecting the spatial uniformity of water droplets, it is found that: there are fewer / sparse large water droplets in area A, while there are more / dense large water droplets in area B. Area A, area B and the large water droplet generating devices in the area are located through the position control system 22. The position control system 22 selects the minimum number of large water droplet generating devices 23 that need to be adjusted, and based on the principle of shortest path and minimum interference, moves the contacts on the sliding rail 21 back and forth and left and right to move some large water droplet generating devices 23 in area B to specific positions in area A. Thereby, the large water droplet content in area B is reduced, and the large water droplet content in area A is increased, so that the large water droplets are evenly distributed in space. The action of moving the contact point can be iterated multiple times until the spatial uniformity of the large water droplets required by the test state is achieved.

[0054] In another embodiment, when it is detected that the water content of the fog in the central area is too high, that is, the fog in the central area is too much / dense, the fog generating nozzle 12 in the central area is located through the nozzle control system 13, and the program built into the nozzle control system 13 is used to close or reduce the switches of some required fog generating nozzles 12 as needed, so as to reduce the water content in the central area, and then adjust the water content and spatial uniformity of the fog in the entire space. That is, the following relationship formula for combining fog characteristic parameters is established:

[0055] F(LWC, MVD, uniformity)~[C n , C m , C d ]~[N i *F i , D0, D n , D m ,n*n(Pw,Pa,ON / OFF),m*m(Pw,Pa,ON / OFF,f,Q,D d x, y)]

[0056] If the system can produce a combined cloud and fog environment that meets the requirements, relevant wind tunnel tests can be carried out; otherwise, the system should continue to be debugged and calibrated until the relevant requirements are met.

[0057] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A large water droplet and cloud generation system, characterized in that: include: A fog generating system (1) is used to generate fog that meets a preset fog standard; A large water droplet generating system (2) is located above the cloud generation system (1) and is used to generate large water droplets that meet a preset large water droplet standard; the large water droplet generating system (2) comprises a meshed movable slide rail (21), a position control system (22) connected to the movable slide rail (21), and a large water droplet generating device (23) arranged at a connection point of the movable slide rail (21); the position control system (22) is used to change the connection point position of the movable slide rail (21), thereby changing the position of the large water droplet generating device (23), and adjusting the spatial uniformity of the large water droplets generated by the large water droplet generating device (23); A water source pipeline (3), connected to the cloud generation system (1) and the large water drop generation system (2), for providing a water source that meets preset indicators; The gas source pipeline (4) is connected to the cloud generation system (1) and is used to provide a gas source that meets preset indicators.

2. The large water droplet and cloud generation system according to claim 1, characterized in that: The preset cloud standards include the preset water content, particle size and spatial uniformity of the cloud.

3. The large water droplet and cloud generation system according to claim 1, characterized in that: The preset large water droplet standard includes the water content, frequency, flow rate, particle size and spatial uniformity of the preset large water droplets.

4. The large water droplet and cloud generation system according to claim 1, characterized in that: The large water droplet generating system (2) further comprises a large water droplet generating device control system (24) which is sequentially connected to the large water droplet generating device (23); the water source pipeline (3) comprises a first water source pipeline (31); the first water source pipeline (31) is connected to the large water droplet generating device control system (24); the large water droplet generating device control system (24) is used to adjust the flow rate and frequency of the first water source pipeline (31), thereby adjusting the water content of the large water droplets generated by the large water droplet generating device (23); the first water source pipeline (31) is used to provide a water source that meets a first preset water source index.

5. The large water droplet and cloud generation system according to claim 1, characterized in that: The mist generating system (1) comprises a spray rake (11), a mist generating nozzle (12) arranged on the spray rake (11), and a nozzle control system (13) connected to the mist generating nozzle (12), wherein the nozzle control system (13) is used to control the opening and closing state of the mist generating nozzle (12) and adjust the water content and spatial uniformity of the mist generated by the mist generating nozzle (12); the water source pipeline (3) comprises a second water source pipeline (32); the nozzle control system (13) is respectively connected to the second water source pipeline (32) and the air source pipeline (4); the second water source pipeline (32) is used to provide a water source that meets a second preset water source index; and the air source pipeline (4) is used to provide an air source that meets a preset air source index.

6. The large water droplet and cloud generation system according to claim 5, characterized in that: A water supply pressure regulator (14) is provided between the nozzle control system (13) and the second water source pipeline (32), and the water supply pressure regulator (14) is used to adjust the water pressure of the second water source pipeline (32).

7. The large water droplet and cloud generation system according to claim 6, characterized in that: The water supply pressure regulator (14) is provided with a water supply switch for controlling the opening and closing of the water supply pressure regulator (14).

8. The large water droplet and cloud generation system according to claim 5, characterized in that: An air supply pressure regulator (15) is provided between the nozzle control system (13) and the air source pipeline (4), and the air supply pressure regulator (15) is used to adjust the air pressure of the air source pipeline (4).

9. The large water droplet and cloud generation system according to claim 8, characterized in that: The gas supply pressure regulator (15) is provided with a gas supply switch for controlling the opening and closing of the gas supply pressure regulator (15).

Images