Vacuum jet protection cover

Abstract

The invention provides a vacuum jet flow protective cover. The protective cover can restrain the on-track liquid drainage plume angle of a spacecraft to be less than 100 degrees. With circular arc transition, liquid jet flow can continuously enter a conical vacuum zone; turbulence and disturbance caused due to a clearance formed between the jet flow and a conical wall are avoided through a 45-degree conical angle; the flash evaporation length of 50 mm can ensure the sufficient flash evaporation of liquid, and the secondary flash evaporation of the liquid flowing out of the protective cover is avoided, and the vacuum jet flow plume angle is effectively restrained; meanwhile, the attachment of ice particles generated by flash evaporation is avoided through the smoothened inner surface and the sharpened opening of the protective cover, the profile of the protective cover is maintained complete, and the vacuum jet flow plume angle is effectively restrained.

Description

technical field [0001] The invention relates to a metal protective cover, in particular to a metal protective cover capable of effectively restricting the plume angle of a liquid vacuum jet. Background technique [0002] The on-orbit discharge of my country's spacecraft requires that the liquid outflow plume angle is less than 100° to protect the spacecraft wall and instruments near the discharge port. Commonly used measures to restrict the plume angle at home and abroad include: changing the initial temperature of the liquid, changing the outflow velocity of the liquid, and changing the diameter of the pipe. Although these measures can improve the outflow plume angle to a certain extent, they are powerless to deal with the unavoidable icing phenomenon that occurs at the orifice in the middle and later stages of discharge, because icing will change the profile of the orifice and the pipeline, resulting in The flow direction is uncontrollable and irregular, which cannot meet...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, in order to solve the problem that the existing measures for restricting the plume angle cannot meet the requirements for the in-orbit discharge of my country's spacecraft, the present invention provides a conical vacuum jet protection cover, which can ensure the full discharge of the plume. During the process, the plume angle is less than 100°, and there will be no plume angle expansion and backflow on the outer edge of the protective cover

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