Clean vacuum system used for engine plume test research and vacuumizing and repressing method thereof

Abstract

The invention provides a clean vacuum system used for engine plume test research and a vacuuminzing and repressing method thereof, belonging to the technical field of engine vacuum science. The clean vacuum system comprises a low vacuum system, a low vacuum liquid nitrogen cold trap system, a high vacuum system, a high vacuum liquid nitrogen cold trap system, a low temperature pump liquid nitrogen supply system A, a low temperature pump liquid nitrogen supply system B, an air repressing system, a nitrogen repressing system, a container vacuum measuring system, a residual gas analysis system, a liquid nitrogen heat sink, and a liquid nitrogen heat sink and plume adsorption pump. In the clean vacuum system, the vacuum is obtained mainly relying on the clean low vacuum system, the high vacuum system and the liquid nitrogen heat sink, the liquid nitrogen heat sink and plume adsorption pump; various clean vacuum degrees required by the plume test can be obtained, and the highest ultrahigh dynamic vacuum degree of 10<-6> Pa can be obtained. Both the low vacuum system and the high vacuum system are configured with the liquid nitrogen cold trap system which is used for absorbing the oil steam produced by working of a mechanical pump, so that the cleanness of the vacuum container can be ensured.

Description

technical field [0001] The invention belongs to the technical field of engine vacuum science, and relates to a design of a vacuum system for a vacuum container, in particular to a clean vacuum system and a method for evacuation and recompression thereof for the research of the engine plume flow test. Background technique [0002] An important premise of the research on the plume effect is to ensure the rapid adsorption of the plume gas, so that the environmental vacuum degree can reach the specified index. [0003] At present, there is no vacuum environment simulation equipment specially used for engine plume test research in China. Space environment simulation equipment such as KM4 and KM6 are mainly used for thermal vacuum test research such as satellites that study static or low-velocity gases. Good pumping speed, and the engine plume test is mainly used to study the characteristics of dynamic high temperature, high-speed plume gas flow field distribution, pollution measu...

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention provides a new type of clean vacuum system specially used for engine plume test research, a clean vacuum system for engine plume test research and its vacuuming and repressurization method, The clean vacuum system can obtain various vacuum degrees required by the plume test according to the flow rate of the engine. The system is clean and pollution-free, the pumping speed of the system is adjustable, and the system has various working modes. The flow rate of the liquid nitrogen supply system can be automatically adjusted, and the pre-pumping, pre-cooling and regeneration of the cryopump are convenient and quick. The solution to the above technical problems increases the cleanliness, reliability, practicability and economy of the operation of the vacuum plume effect test system

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