A spray system for a cryogenic wind tunnel

Abstract

The utility model relates to a wind tunnel technical field discloses a low temperature wind tunnel's spraying system mainly comprises spraying device, water supply system, gas supply system, heating system and control system, spraying device includes a plurality of spraying rake, is equipped with spraying water pipe, heat preservation water pipe, spraying gas pipe and a plurality of spraying passageway in each spraying rake, and spraying passageway is linked together with spraying water pipe, heat preservation water pipe, spraying gas pipe, and the head end of spraying passageway is connected with the nozzle, water supply system is linked together with spraying water pipe through water supply pipeline, and heating system is linked together with heat preservation water pipe through heating pipeline, and heat preservation water pipe is closely arranged with spraying water pipe, and gas supply system is linked together with spraying gas pipe through gas supply pipeline, the gas supply pipeline of each spraying passageway, water supply pipeline is individually controlled by solenoid valve, and gas supply system, water supply system, heating system are electrically connected with control system, the utility model can guarantee that the spraying water pipe in spraying water will not reduce below freezing point, and the freezing condition of stable icing cloud can be provided.

Description

Technical Field

[0001] This utility model relates to the field of wind tunnel technology, specifically to a spray system for a low-temperature wind tunnel. Background Technology

[0002] An icing wind tunnel is a large, complex, specialized wind tunnel. Its principle involves creating a low-temperature, low-pressure, and high-humidity cloud environment within the tunnel, then simulating the icing process of aircraft components as they pass through clouds using airflow. An icing wind tunnel is a ground-based testing facility for studying the icing morphology, icing tolerance, and anti-icing (de-icing) technologies of different components' windward surfaces and external sensors of detection instruments when aircraft fly under icing weather conditions. The spray system is a key component of an icing wind tunnel, directly affecting its ability to simulate the diameter of supercooled cloud droplets, liquid water content, and the extent of cloud uniformity.

[0003] Existing icing wind tunnel spray systems typically consist of a water supply subsystem, an air supply subsystem, and spray devices. The water supply subsystem pressurizes the water using a pipeline pump and regulates the flow and pressure using an electric regulating valve. This subsystem also has heating capabilities. The air supply subsystem provides atomized air to the spray system. The simulated icing device simulates icing conditions in a natural low-temperature environment by atomizing gas and water in a two-phase nozzle. To prevent liquid from freezing in the low-temperature pipelines or nozzles and to avoid damage to the test object from ice detachment, heated water and air are required. However, due to the low-temperature environment inside the icing wind tunnel, insufficient liquid temperature in the nozzles can easily cause icing, while excessively high temperatures can affect the ambient temperature of the spray section within the icing wind tunnel. Relying solely on controlling the water supply temperature of the water supply subsystem is insufficient to achieve a stable spray state. Utility Model Content

[0004] To address the shortcomings of the existing technology, this invention provides a spray system for a low-temperature wind tunnel that can provide stable icing cloud conditions within the low-temperature wind tunnel.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A spray system for a low-temperature wind tunnel includes a spraying device, a water supply system, an air supply system, a heating system, and a control system. The spraying device includes multiple spray rakes, each with multiple spray channels, and also includes a spray water pipe, an insulated water pipe, and a spray air pipe. The spray channels are connected to the spray water pipe, the insulated water pipe, and the spray air pipe, with nozzles connected to the head of each spray channel. The water supply system is connected to the spray water pipe via a water supply pipeline, and the heating system is connected to the insulated water pipe via a heating pipeline. The insulated water pipe is located adjacent to the spray water pipe. The air supply system is connected to the spray air pipe via an air supply pipeline. The water supply system and the air supply system provide the spraying device with the water and air required to form the spray, respectively. The heating system provides a constant temperature environment for the spray water pipe. The air supply pipeline and water supply pipeline for each spray channel are individually controlled by a solenoid valve. The air supply system, water supply system, heating system, and control system are electrically connected.

[0007] As a preferred technical solution, the spraying device further includes a support frame, which is fixed to the side walls on both sides of the low-temperature wind tunnel. The spray rake is fixed to both sides of the support frame. The outer surface of the spray rake is wing-shaped from back to front. The spray channel is arranged inside the spray rake in a direction from back to front. The heat-insulating water pipe, spray water pipe, and spray air pipe are arranged in sequence from back to front perpendicular to the spray channel. The gas channel surrounds the water channel in the nozzle. The spray rake is filled with a heat-insulating layer that covers the spray channel.

[0008] As a preferred technical solution, the spraying device has spray channels arranged in a matrix, with 8 spray rakes arranged in parallel with equal vertical spacing, and each spray rake has 7 spray channels arranged with equal horizontal spacing.

[0009] As a preferred technical solution, the air supply system includes an air compressor, an air tank, an air dryer, a filter, an electromagnetic pressure regulating valve, an air heater, an air supply pipeline, and a control valve; the rear end of the air compressor is connected to the air tank, which is equipped with a pressure sensor; the rear end of the air tank is sequentially connected to a pre-filter, an air dryer, a secondary filter, an electromagnetic pressure regulating valve, and an air heater; the rear end of the air heater is connected to the spray pipe inside the spray rake via the air supply pipeline.

[0010] As a preferred technical solution, the gas storage tank and air dryer are equipped with safety valves and exhaust pipes.

[0011] As a preferred technical solution, the air supply pipeline at the rear end of the air heater is also connected to a water purging pipeline, which is connected to the water supply pipeline and is used to purge the water supply pipeline after the experiment is completed.

[0012] As a preferred technical solution, the water supply system includes a pure water device, an insulated heating water tank, and a water pump. The pure water device is used to purify the incoming water. The pure water device is connected to the insulated heating water tank through a pipeline. The insulated heating water tank is connected to the spray water pipe inside the spray rake through the water pump and the water supply pipeline. The water supply pipeline at the front end of the spray rake is also connected to a main return water pipeline. The rear end of the spray water pipe of the spray rake is connected to a flow simulation pipeline. The main return water pipeline and the flow simulation pipeline are connected to the insulated heating water tank. Flow meters and regulating valves are installed on both the main return water pipeline and the flow simulation pipeline. A regulating valve is installed on the water supply pipeline at the front end of the spray rake, located after the main return water pipeline.

[0013] As a preferred technical solution, temperature sensors are installed on both the insulated heating water tank and the water supply pipeline to monitor the water temperature. An auxiliary return water pipeline is also connected to the water supply pipeline at the rear end of the water pump, and the auxiliary return water pipeline is connected to the insulated heating water tank.

[0014] As a preferred technical solution, the heating system includes an insulated heating water tank, a water supply pump, insulated pipelines, temperature monitoring equipment, and pressure monitoring equipment. The insulated heating water tank is used to heat the heating water and sends it to the insulated water pipes inside the spray rake via the water supply pump. The temperature monitoring equipment and pressure monitoring equipment are used to monitor the temperature and pressure of the heating water in the insulated pipelines.

[0015] As a preferred technical solution, the insulated water pipes of each spray rake are connected in series, and the ends of the insulated water pipes are connected to the insulated heating water tank through a second return water pipe.

[0016] The beneficial effects of this utility model are as follows:

[0017] The spray system of this utility model for a low-temperature wind tunnel provides the spray device with the necessary water and air to form a spray through a water supply system and an air supply system, and provides a constant temperature environment for the spray water pipe through a heating system, so that the spray water pipe inside the spray rake is kept in a constant temperature environment, thereby ensuring that the spray water in the spray water pipe will not drop below the freezing point and preventing the spray water pipe from freezing and clogging.

[0018] The spray system of the low-temperature wind tunnel of this utility model has an air supply system that is also connected to a water purging pipeline. The water purging pipeline is connected to the water supply pipeline and is used to purge the water supply pipeline after the experiment. After the experiment, the spray rake water supply pipeline, drainage pipe, spray channel and nozzle can be dried to avoid residual water freezing and causing pipeline blockage.

[0019] The spray system of the low-temperature wind tunnel of this utility model has an air supply system that can perform a series of processes on the air, such as compression, oil and dust removal and filtration, drying, dust removal and filtration, pressure stabilization and heating. The finished gas produced meets the corresponding air quality requirements and reaches the appropriate temperature and pressure requirements.

[0020] The spray system of this utility model for a low-temperature wind tunnel has a water supply system that connects to a main return water pipe on the water supply pipe at the front end of the spray rake, and a flow simulation pipe at the rear end of the spray rake. According to the requirements of the test indicators, the total pressure entering the spray rake and the flow rate at the rear end of the spray rake can be controlled by the flow meters and regulating valves on the main return water pipe and the flow simulation pipe. The spray system can reach a stable state in the simulation state. Then, by switching the flow simulation pipe and the spray channel, the spray state can be quickly stabilized. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an overall schematic diagram of an embodiment of the present utility model;

[0023] Figure 2 This is a cross-sectional schematic diagram of the spraying device in an embodiment of this utility model;

[0024] Figure 3 This is a schematic diagram of the arrangement of the spraying device in an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of some nozzles used in the spray device according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the gas supply system in an embodiment of this utility model;

[0027] Figure 6 This is a schematic diagram of the water supply system in an embodiment of this utility model;

[0028] Figure 7 This is a schematic diagram of the heating system in an embodiment of this utility model.

[0029] Reference numerals: 1-Spraying device, 2-Water supply system, 3-Air supply system, 4-Heating system, 5-Control system, 11-Spray rake, 12-Insulated water pipe, 13-Spray water pipe, 14-Spray air pipe, 15-Nozzle, 16-Solenoid valve, 17-Insulation layer, 21-Pure water equipment, 22-Insulated heating water tank, 23-Water pump, 24-Water supply pipeline, 25-Main return water pipeline, 26-Auxiliary return water pipeline, 31-Air compressor, 32-Air storage tank, 33-Pre-filter, 34-Air dryer, 35-Secondary filter, 36-Air heater, 37-Water purging pipeline, 38-Solenoid pressure regulating valve, 42-Water supply pump, 43-Insulated pipeline, 44-Secondary return water pipeline. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] A spray system for a low-temperature wind tunnel, such as Figures 1-7 As shown, it mainly consists of a spray device 1, a water supply system 2, an air supply system 3, a heating system 4, and a control system 5. The spray device 1 includes multiple spray rakes 11, each spray rake 11 having multiple spray channels, and also includes a spray water pipe 13, an insulated water pipe 12, and a spray air pipe 14. The spray channels are connected to the spray water pipe 13, the insulated water pipe 12, and the spray air pipe 14, and the head end of the spray channel is connected to a nozzle 15. The water supply system 2 is connected to the spray water pipe 13 through a water supply pipeline, and the heating system 4 is connected to the spray water pipe 13 through a water supply pipeline. The heating pipeline is connected to the insulated water pipe 12, which is located adjacent to the spray water pipe 13. The air supply system 3 is connected to the spray air pipe 14 through the air supply pipeline. The water supply system 2 and the air supply system 3 provide the spray water and air required to form the spray device, respectively. The heating system 4 provides a constant temperature environment for the spray water pipe 13. The air supply pipeline and water supply pipeline of each spray channel are individually controlled by the solenoid valve 16. The air supply system 3, water supply system 2, and heating system 4 are electrically connected to the control system 5.

[0032] Furthermore, the spray device 1 also includes a support frame, which is fixed to the side walls on both sides of the low-temperature wind tunnel. The spray rake 11 is fixed to the support frame on both sides. The outer surface of the spray rake 11 has a wing-shaped envelope from back to front. The spray channel is arranged inside the spray rake 11 in a back-to-front direction. The insulated water pipe 12, spray water pipe 13, and spray air pipe 14 are arranged perpendicular to the spray channel from back to front. The gas channel surrounds the water channel inside the nozzle 15. During the low-temperature test, the nozzle 15 always maintains a gas supply state, in an air-water envelope mode, to prevent the nozzle from freezing. The spray rake 11 is filled with an insulation layer 17 covering the spray channel. The insulation layer, together with the insulated water pipe, keeps the spray water pipe 13 inside the spray rake 11 in a constant temperature environment and ensures that the spray water in the spray water pipe 13 does not drop below the freezing point, preventing the spray water pipe 13 from freezing and becoming blocked. The spray channels in the spray device 11 are arranged in a matrix. In one specific embodiment, there are eight spray rakes 11, arranged vertically at equal intervals in parallel. Each spray rake 11 has seven spray channels arranged side by side at equal intervals. Figure 3 The air supply and water supply lines for each spray channel are individually controlled by solenoid valve 16, allowing adjustment of the actual number of spray channels in use as needed. Figure 4 This is a diagram illustrating a reduction in the number of nozzles in use. Solid dots represent nozzles that retain spray, while the rest are closed. In this case, the number of nozzles that can spray is halved.

[0033] Furthermore, the air supply system 3 mainly includes an air compressor 31, an air tank 32, a pre-filter 33, an air dryer 34, a secondary filter 35, an electromagnetic pressure regulating valve 38, an air heater 36, an air supply pipeline, and a control valve; the rear end of the air compressor 31 is connected to the air tank 32, and the air tank 32 is equipped with a pressure sensor. The rear end of the air tank 32 is sequentially connected to the pre-filter 33, the air dryer 34, the secondary filter 35, the electromagnetic pressure regulating valve 38, and the air heater 36. The rear end of the air heater 36 is connected to the spray pipe 14 in the spray rake 11 through the air supply pipeline. When the system test requires air supply, outdoor air enters the air compressor 31 after being filtered at the intake. The compressed air from the air compressor 31 enters the compressed air storage tank 32 through a pipeline. The compressed air pressure in the storage tank 32 is monitored by a pressure sensor. When the compressed air pressure in the storage tank 32 reaches a certain value, the electromagnetic pressure regulating valve 38 after the storage tank 32 opens, and the compressed air enters the pre-filter 33 through the pipeline valve. Then, the compressed air enters the heatless air dryer 34 for drying, undergoes primary and fine filtration through the secondary filter 35, and then passes through the electromagnetic pressure regulating valve 38 for primary separation and pressure stabilization before entering the air heater 36 for heating. In this process of compression-oil and dust removal filtration-drying-dust removal filtration-pressure stabilization-heating, the produced finished gas meets the corresponding air quality requirements. Finally, it is delivered to the low-temperature wind tunnel through the air supply pipeline and control valve, and sprayed out through the spray pipe 14 and spray channel of the spray rake 11 to meet its gas requirements. Pressure and temperature sensors are installed on the air supply pipeline to monitor the pressure and temperature of the gas entering the spray rake. Furthermore, safety valves and exhaust pipes are installed at the gas storage tank 32 and the air dryer 34 to discharge excess gas into the atmosphere through a silencer. Furthermore, the air supply pipe at the rear end of the air heater 36 is also connected to a water purging pipe 37, which is connected to a water supply pipe for purging the water supply pipe after the experiment.

[0034] Furthermore, the water supply system 2 mainly includes a pure water device 21, an insulated heating water tank 22, and a water pump 23. The pure water device 21 is used to purify the incoming water. The pure water device 21 is connected to the insulated heating water tank 22 through a pipeline. The insulated heating water tank 22 is connected to the spray water pipe 13 inside the spray rake 11 through the water pump 23 and the water supply pipeline 24. The water supply pipeline 24 at the front end of the spray rake 11 is also connected to the main return water pipeline 25. The rear end of the spray water pipe 13 of the spray rake 11 is connected to the flow simulation pipeline. The main return water pipeline 25 and the flow simulation pipeline are connected to the insulated heating water tank. Flow meters and regulating valves are installed on both the main return water pipeline 25 and the flow simulation pipeline to control the total pressure entering the spray rake 11 and the flow rate at the rear end of the spray rake. A regulating valve is provided on the water supply pipeline 24 at the front end of the spray rake 11 after the main return water pipeline 25. During the test, the pressure of the water supply to the nozzle and the flow rate of the nozzle under the specified operating condition were determined according to the requirements of the test indicators and the parameters calibrated on the nozzle. The water pressure at the front end and the flow rate at the rear end of the spray rake were adjusted to meet the test conditions by simultaneously adjusting the regulating valves on the main return water pipeline 25 and the flow simulation pipeline. The water pressure difference caused by the height difference between each spray rake 11 was eliminated by adjusting the regulating valves at the front end of each spray rake 11. In the simulation state, after all parameters stabilized, the solenoid valves controlling each spray channel were opened, and the flow simulation pipeline was closed at the same time. Switching the flow simulation pipeline and the nozzles could quickly stabilize the spray state. After the spraying in a certain state ended, if there was still a spraying task, the flow simulation pipeline and the nozzles were switched, and the next set of spray parameters was adjusted. If there was no spraying task, the drain solenoid valve at the water outlet of the spray rake was opened, the water pump 23 was stopped, the solenoid valve of the water purging pipeline 37 was opened, and the water in the water supply pipeline of the spray rake 11 was purged. When no water flowed out of the spray rake drain pipe, the spray rake drain solenoid valve and the main return water pipeline regulating valve were closed, and the spray channel solenoid valve was opened to purge the residual water in the spray channel. Preferably, temperature sensors are provided on both the insulated heating water tank 22 and the water supply pipeline 24 to monitor the water temperature. An auxiliary return water pipeline 26 is also connected to the water supply pipeline at the rear end of the water pump 23. The auxiliary return water pipeline 26 is connected to the insulated heating water tank 22. When the water temperature on the water supply pipeline is lower than the preset temperature, the water flows back to the insulated heating water tank 22 through the auxiliary return water pipeline 26 for circulation heating.

[0035] Furthermore, the heating system 4 includes an insulated heating water tank 22 (shared with the water supply system), a water supply pump 42, insulated pipes 43, temperature monitoring equipment, and pressure monitoring equipment. The insulated heating water tank 22 is used to heat the heating water and delivers it to the insulated water pipes 12 inside the spray rake 11 via the water supply pump 42. The temperature monitoring equipment and pressure monitoring equipment are used to monitor the temperature and pressure of the heating water in the insulated pipes 43. The insulated water pipes 12 of each spray rake 11 are connected in series, and the ends of the insulated water pipes 12 are connected to the insulated heating water tank 22 via a second return water pipe 44. The heating water passes through each spray rake 11 sequentially via the insulated pipes 43 and finally returns to the insulated heating water tank 22. The heating power is automatically adjusted according to the return water temperature and the water temperature requirements to keep the spray water pipes inside the spray rake 11 in a constant temperature environment. It can also ensure that the water in the spray water pipes will not drop below the freezing point, so that the spray water supply pipes will not freeze.

[0036] The control system 5 is electrically connected to the gas supply system 3, water supply system 2, and heating system 4, and is used to regulate the opening and closing of each electrical component and its operating parameters in the gas supply system 3, water supply system 2, and heating system 4.

[0037] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A spray system for a low-temperature wind tunnel, characterized in that: The system includes a spraying device, a water supply system, an air supply system, a heating system, and a control system. The spraying device includes multiple spray rakes, each with multiple spray channels, as well as a spray water pipe, an insulated water pipe, and a spray air pipe. The spray channels are connected to the spray water pipe, the insulated water pipe, and the spray air pipe, and nozzles are connected to the head of the spray channels. The water supply system is connected to the spray water pipe through a water supply pipeline, and the heating system is connected to the insulated water pipe through a heating pipeline. The insulated water pipe is located adjacent to the spray water pipe. The air supply system is connected to the spray air pipe through an air supply pipeline. The water supply system and the air supply system provide the spraying device with the water and air required to form a spray, respectively. The heating system provides a constant temperature environment for the spray water pipe. The air supply pipeline and water supply pipeline of each spray channel are individually controlled by a solenoid valve. The air supply system, water supply system, heating system, and control system are electrically connected.

2. The spray system for a low-temperature wind tunnel according to claim 1, characterized in that: The spraying device also includes a support frame, which is fixed to the side walls on both sides of the low-temperature wind tunnel. The spray rake is fixed to the support frame on both sides. The outer surface of the spray rake is wing-shaped from back to front. The spray channel is arranged inside the spray rake in a direction from back to front. The heat-insulating water pipe, spray water pipe, and spray air pipe are arranged in sequence from back to front perpendicular to the spray channel. The gas channel surrounds the water channel in the nozzle. The spray rake is filled with a heat-insulating layer that covers the spray channel.

3. The spray system for a low-temperature wind tunnel according to claim 2, characterized in that: The spraying device has a matrix arrangement of spray channels and eight spray rakes. The spray rakes are arranged in parallel with equal vertical spacing, and each spray rake has seven spray channels with equal horizontal spacing.

4. The spray system for a low-temperature wind tunnel according to claim 1, characterized in that: The air supply system includes an air compressor, an air tank, an air dryer, a filter, an electromagnetic pressure regulating valve, an air heater, an air supply pipeline, and a control valve. The air compressor is connected to the air tank at its rear end. The air tank is equipped with a pressure sensor. The air tank is connected in sequence to a pre-filter, an air dryer, a secondary filter, an electromagnetic pressure regulating valve, and an air heater at its rear end. The air heater is connected to the spray pipe inside the spray rake via the air supply pipeline.

5. The spray system for a low-temperature wind tunnel according to claim 4, characterized in that: Safety valves and exhaust pipes are provided at the gas storage tank and air dryer.

6. The spray system for a low-temperature wind tunnel according to claim 4, characterized in that: The air supply pipeline at the rear end of the air heater is also connected to a water purging pipeline, which is connected to the water supply pipeline and is used to purge the water supply pipeline after the experiment is completed.

7. The spray system for a low-temperature wind tunnel according to claim 1, characterized in that: The water supply system includes a pure water device, an insulated heating water tank, and a water pump. The pure water device is used to purify the incoming water. The pure water device is connected to the insulated heating water tank through a pipeline. The insulated heating water tank is connected to the spray water pipe inside the spray rake through the water pump and the water supply pipeline. The water supply pipeline at the front end of the spray rake is also connected to a main return water pipeline. The rear end of the spray water pipe of the spray rake is connected to a flow simulation pipeline. The main return water pipeline and the flow simulation pipeline are connected to the insulated heating water tank. Flow meters and regulating valves are installed on both the main return water pipeline and the flow simulation pipeline. A regulating valve is installed on the water supply pipeline at the front end of the spray rake, located after the main return water pipeline.

8. The spray system for a low-temperature wind tunnel according to claim 7, characterized in that: Temperature sensors are installed on the insulated heating water tank and the water supply pipeline to monitor the water temperature. An auxiliary return water pipeline is also connected to the water supply pipeline at the rear end of the water pump, and the auxiliary return water pipeline is connected to the insulated heating water tank.

9. The spray system for a low-temperature wind tunnel according to claim 1, characterized in that: The heating system includes an insulated heating water tank, a water supply pump, insulated pipelines, temperature monitoring equipment, and pressure monitoring equipment. The insulated heating water tank is used to heat the heating water and sends it to the insulated water pipes inside the spray rake via the water supply pump. The temperature monitoring equipment and pressure monitoring equipment are used to monitor the temperature and pressure of the heating water in the insulated pipelines.

10. The spray system for a low-temperature wind tunnel according to claim 9, characterized in that: Each of the spray rakes has an insulated water pipe connected in series, and the end of the insulated water pipe is connected to the insulated heating water tank through a second return water pipe.

Images