Low-air-pressure ejector device applied to mars wind tunnel

Abstract

The invention aims to provide a low-air-pressure ejector device applied to a mars wind tunnel. The device comprises an ejector shell, an ejector cavity shell, an ejector cavity, multiple of spray pipes and an air supply pipeline; the air supply pipeline communicates with an air source; the ejector cavity shell surrounds the ejector shell for a circle and is connected with the outer wall of the ejector shell in a sealed mode to form the closed ejector cavity, and the air supply pipeline communicates with the ejector cavity; and the multiple of spray pipes are parallel to one another and penetrate through the ejector shell in the radial direction at certain intervals, the heads and the tails of the spray pipes communicate with the ejector cavity, and multiple of nozzles are formed in the parts, positioned in the ejector shell, of the spray pipes. Compared with a conventional ejector of the wind tunnel, the device has the beneficial effects that the ejection efficiency is extremely high,the same wind speed is formed, the gas consumption of the conventional ejector is large, the gas consumption of the device is small, the wind speed can be continuously formed for a long time, and thehighest wind speed can be remarkably increased.

Description

technical field [0001] The invention relates to a low-pressure ejector device applied to a Mars wind tunnel. Background technique [0002] The driving system of the atmospheric pressure low-speed wind tunnel is powered by a controllable motor and a fan driven by it. Another kind of temporary flushing high-speed wind tunnel, the air is pressurized and stored in the air storage tank in advance with a compressor, or the vacuum tank connected with the outlet pipe of the wind tunnel is evacuated with a vacuum pump, and the valve is quickly opened during the experiment to make the high-pressure air Enter the cave directly or through the ejector or suck the air into the cave by the vacuum tank, so there are various forms of blowing, ejection, suction and their combination. Generally, the Reynolds number is relatively high, and its working time can be changed by several seconds to tens of seconds. [0003] For the driving system of the Mars wind tunnel, its power driving system mu...

AI Technical Summary

Problems solved by technology

[0004] In the traditional ejector, the diameter of the nozzle throat is relatively thick, the air supply pressure is high, and the gas consumption is large, which can make the nozzle outlet form a high Mach number. Under the action of the ejector, a high wind speed is formed in the test area

However, the Mars wind tunnel has extremely low air pressure, extremely low gas density, and low temperature. The use of traditional ejectors not only cannot form high wind speeds, but the jet stream is easy to freeze instantly, and it will also block the throat of the ejector. , reduce the efficiency of the ejector. In a vacuum container with low air pressure (100-1500Pa), simply increasing the intake pressure of the conventional ejector can no longer achieve high wind speed. The maximum wind speed in the test section is only about 70m / s, and Cannot be tested continuously for a long time

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