Backflow type wind tunnel device for simulating Mars low-pressure low-density dust storm environment

Abstract

The invention provides a backflow-type wind tunnel device for simulating a Mars low-pressure low-density dust storm environment. The device comprises a backflow-type wind tunnel, an ejector, and an jetting device; the backflow-type wind tunnel comprises a stable segment, a contraction segment, a test segment, a first diffusion segment, a second diffusion segment, a mixing segment, a third diffusion segment, and a large-angle diffusion segment; a first corner is arranged between the first diffusion section and the second diffusion section in a communicated manner; a second corner is arranged between the second diffusion section and the mixing section in a communicated manner;a third corner and a fourth corner are sequentially arranged between the third diffusion section and the large-angle diffusion section in a communicated manner;a corner flow deflector is arranged in each corner; the ejector is arranged in the mixing section; and the jetting device is arranged in the contraction section. The ejector is combined with the backflow-type wind tunnel, the wind speed required by the test section can be achieved through the small inlet pressure of the ejector; the mode of combining the large contraction ratio and the large-angle diffusion section is adopted, so that the airflow quality is improved, losses are reduced, the overall size of the wind tunnel is reduced, and the vacuumizing cost is reduced.

Description

technical field [0001] The invention belongs to the field of ground simulation of space environment for deep space exploration, and in particular relates to a backflow type wind tunnel device for simulating Martian low-pressure and low-density dust storm environment. Background technique [0002] The Mars Wind Tunnel is a simulation device developed for the extreme environment of Mars. my country’s Tianwen-1 has been launched, but for the Tianwen-1 Mars rover, only the existing technology can be used to simulate wind and heat at low wind speeds. The Martian environment is most notably low pressure, high wind speed, and sandy dust environment. Therefore, it is necessary for us to design a wind tunnel that can simulate the low pressure, high wind speed, and sandy dust environment on Mars. Due to the large size of the Mars rover, the required test section The size is also very large. For a linear wind tunnel, a large vacuum chamber is required outside to complete the formation of...

AI Technical Summary

Problems solved by technology

[0002] The Mars Wind Tunnel is a simulation device developed for the extreme environment of Mars. my country’s Tianwen-1 has been launched, but for the Tianwen-1 Mars rover, only the existing technology can be used to simulate wind and heat at low wind speeds. The Martian environment is most notably low pressure, high wind speed, and sandy dust environment. Therefore, it is necessary for us to design a wind tunnel that can simulate the low pressure, high wind speed, and sandy dust environment on Mars. Due to the large size of the Mars rover, the required test section The size is also very large. For a linear wind tunnel, a large vacuum chamber is required outside to complete the formation of the wind speed. Because the size of the wind tunnel is too large, the volume of the vacuum chamber will be too large. In order to generate a low-pressure environment, a vacuum pump set is required To vacuumize, a vacuum chamber that is too large will cost a lot of time for vacuuming, but for the backflow type wind tunnel, no vacuum chamber is needed, and the wind speed can be generated by itself, small in size, and low in vacuuming costs

For wind speed simulation, fans or ejectors are usually used, but it is difficult for fans to achieve high wind speeds in low-pressure environments. For linear ejector wind tunnels, although high wind speeds can be achieved, its principle is to use ejectors The device injects high-pressure gas to reduce the surrounding pressure. Due to the high pressure of the test section, the wind speed is formed due to the pressure difference, but the mass flow rate of the gas passing through the test section is only the mass flow rate of the injected gas, and the gas coming out of the injector is directly drawn Extraction, the efficiency is low, and too much gas is consumed to achieve high wind speed, so it is necessary to improve the efficiency, but for the recirculation type wind tunnel, the mass flow rate after the test section is the sum of the two, so the efficiency is high, and there is no waste of resources. So a Martian wind tunnel that can simulate the sand and dust environment is needed

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