Economic and efficient opening direct current type ice wind tunnel

[0019] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples, and detailed descriptions are as follows with accompanying drawings:

[0020] See Figure 1 ~ Figure 4 , An economical and efficient open-ended direct current ice wind tunnel, including an air inlet 1, a power section 2, a diffusion section 3, a stabilization section 4, an ice and snow particle generation section 5 and a test section 7 connected in sequence.

[0021] The ice and snow particle generation section 5 is provided with a liquid nitrogen spray head 14 and a pneumatic spray head 15. The liquid nitrogen spray head 14 is connected to a liquid nitrogen source 10 through a liquid nitrogen pipeline 17 to form a liquid nitrogen refrigeration system 8, and the pneumatic spray head 15 passes The mixing pipeline is connected with the pressure gas source 11 and the pressure water source 12 to form a water particle generation system 9. A fan is installed in the power section 2.

[0022] In this embodiment, the above-mentioned ice wind tunnel further includes a mixed contraction section 6 connected between the ice and snow particle generation section 5 and the test section 7. The pressure water source 12 is connected to the mixing pipeline through a pressure water pipeline 21, and a heat preservation and heating device 13 is provided on the pressure water pipeline 21. A pressure water source valve 22 is installed at the outlet of the pressure water source 12. A temperature and flow measuring device 16 is provided at the exit of the mixing and shrinking section 6. The pressure gas source 11 is connected to the mixing pipeline through a pressure gas pipeline 19, and a pressure gas source valve 20 is installed at the outlet of the pressure gas source 11. A liquid nitrogen source valve 18 is installed at the outlet of the liquid nitrogen source 10. The liquid nitrogen source 10 is composed of a Dewar flask and liquid nitrogen stored therein.

[0023] In order to prevent the generated ice and snow particles from returning to cause damage to motor equipment such as fans in the power section, the wind tunnel of the present invention is designed as an open direct current type. At the same time, since the ice and snow particles are generated before entering the test section 7, it has no effect on most stages of the wind tunnel. In the test, only the maintenance of the mixed contraction section 6 and the test section 7 is enough.

[0024] The working principle of each part of the above ice wind tunnel is as follows:

[0025] The liquid nitrogen refrigeration system 8 provides ultra-low temperature liquid nitrogen required to generate ice crystal particles, and is ejected by the liquid nitrogen nozzle 14. In this embodiment, the liquid nitrogen refrigeration system consists of a liquid nitrogen source 10, a liquid nitrogen pipeline 17, a liquid nitrogen nozzle 15 and a liquid nitrogen source valve 18. The liquid nitrogen flows out from the liquid nitrogen source 10, and is sprayed from the liquid nitrogen nozzle 14 into the ice and snow particle generation section 5 of the wind tunnel through the liquid nitrogen pipeline 17, where the liquid nitrogen is rapidly vaporized in the ice and snow particle generation section 5 to generate ultra-low temperature gas. And mixed with the stable section 4 in the wind tunnel to produce cold air, and the liquid nitrogen flow can be controlled by the liquid nitrogen source pressure valve 18 to control the cooling effect. It is generally controlled between -30°C and -10°C.

[0026] The water particle generating system 9 provides fine water particles required to generate ice and snow particles, and is sprayed by a pneumatic nozzle 15. In this embodiment, the water particle generation system consists of a pneumatic nozzle 15, a pressure water source 12, a pressure gas source 11, a pressure gas pipeline 19, a pressure water pipeline 21, a heat preservation and heating device 13, a pressure gas source valve 20, and a pressure water source valve. 22 and mixing pipeline. The pressurized gas in the pressurized gas source 11 and the pressurized water in the pressurized water source 12 respectively flow through their respective pipelines into the mixing pipeline, and are mixed before entering the pneumatic nozzle 15, and fine water particles are generated by the pneumatic nozzle 15 and sprayed by the pneumatic nozzle 15. . The flow of pressure gas and pressure water can be controlled by adjusting the pressure gas source valve 20 and the pressure water source valve 22 respectively. Because the pneumatic nozzle 15 is in a very low temperature environment affected by the incoming flow of cold air, it may cause the water in the nozzle to condense and block the nozzle. In order to prevent this phenomenon, a heat preservation and heating device 13 is installed on the pressure water pipeline to heat the water body in the pressure water pipeline 21 so that the temperature of the water body sprayed by the nozzle is not too low, and the length of the pressure water pipeline 21 is extended as much as possible, thereby Extend the heating time to make the temperature of the water body sprayed by the nozzle reach about 20 ℃, so as to ensure the smooth flow of the pneumatic nozzle.

[0027] The cold air and water particles are fully mixed in the mixing and shrinking section 6 to generate a fluid containing ice crystal particles, which is accelerated to the required flow rate through the shrinkage and enters the test section 7 to simulate the formation of an ice and snow fluid environment in the test section 7. A temperature and flow measuring device 16 is installed at the exit of the mixing and shrinking section 7 to monitor the flow and temperature of the fluid actually entering the test section.

[0028] The specific use process of the present invention is as follows:

[0029] First turn on the fan located in the power section 2 to form a stable airflow in the wind tunnel. Open the pressure water source valve 22 and the heat preservation and heating device 13 on the pressure water pipeline to preheat and keep the pressure water pipeline. When the heating reaches a predetermined temperature, such as 40°C to 50°C, the pressure water source valve 22 and the heat preservation heating device 13 are closed. The liquid nitrogen source valve 18 is opened to cool the fluid in the wind tunnel, and the test model 23 is placed in the test section 7 at the same time. By adjusting the liquid nitrogen source valve 18, the temperature of the refrigerant gas in the wind tunnel is adjusted. When the temperature of the refrigerating gas drops to a predetermined value, such as -30°C to -10°C, open the pressure air source valve 20, the pressure water source valve 22 and the heat preservation and heating device 13, and spray fine water into the ice and snow particle generation section 5 through the pneumatic nozzle 15 Particles, thereby generating ice and snow particle fluid in the ice wind tunnel. The actual temperature and flow rate of the ice and snow particle fluid are monitored by the temperature and flow measuring device 16 of the mixing and contraction section, and the concentration of ice and snow particles in the ice and snow particle fluid in the wind tunnel is adjusted by adjusting the opening of the pressure air source valve 20 and the pressure water source valve 22 . So as to achieve or approximate the simulated conditions required by the test as much as possible.

[0030] When the predetermined test time is reached, first close the liquid nitrogen source valve 18, the pressure gas source valve 20, the pressure water source valve 22 and the heat preservation and heating equipment 13, and when the fluid temperature in the wind tunnel returns to normal temperature, the fan in the power section 2 is turned off. Perform measurement records on the test section, collect test data, and end the test.

[0031] Although the preferred embodiments of the present invention are described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the enlightenment of the present invention, persons can make many forms without departing from the purpose of the present invention and the protection scope of the claims, and these all fall within the protection scope of the present invention.