Quick estimation method for unsymmetrical dimethylhydrazine diffusion concentration distribution in long-storage warehouse

Abstract

The invention discloses a quick estimation method for unsymmetrical dimethylhydrazine diffusion concentration distribution in a long-storage warehouse. The method is suitable for quick estimation of concentration distribution after propellant leakage and diffusion in a closed space. According to the quick estimation method for unsymmetrical dimethylhydrazine diffusion concentration distribution inthe long-storage warehouse, first, through a reasonable hypothesis, an established unsymmetrical dimethylhydrazine concentration distribution basic calculation formula is simple and practical; second, the influences of four situations, where leakage is most possible to occur, on the leakage rate are fully considered, wherein the four situations include gas leakage above a liquid level in a storage tank, liquid leakage below the liquid level in the storage tank, hole leakage caused by damage to a valve and a pipeline and leakage at the connection position of the valve and the pipeline or the storage tank; third, based on a large amount of numerical simulation data, an average wind speed calculation model is determined; and last, the influences of different areas in the long-storage warehouse on diffusion parameters are fully considered. Through the method, unsymmetrical dimethylhydrazine gas concentration distribution in the warehouse can be quickly estimated according to alarm data ofan unsymmetrical dimethylhydrazine gas sensor in the long-storage warehouse; and the method is simple, easy to implement and small in error.

Description

technical field [0001] The invention belongs to the field of safety analysis of aerospace launch sites, and is a method for quickly estimating the diffusion concentration distribution of unsymmetrical dimethylhydrazine in a long storage warehouse. Background technique [0002] With the development of the aerospace industry, launch missions are intensive, and the safety of the launch site is particularly important. Unsymmetrical dimethylhydrazine is a colorless, toxic and flammable liquid. It is the main fuel for launch tests and launch vehicles of missiles, satellites, and spaceships. According to mission requirements, a certain amount of propellant is usually stored for a long time. In the unsymmetrical dimethylhydrazine long-term storage room, there is a possibility of leakage at the pipeline connections, valves, flanges and other positions. After the leakage, it evaporates on the ground and becomes toxic gas and enters the air, posing a threat to the safety of the staff i...

AI Technical Summary

Problems solved by technology

The most commonly used method to study the diffusion concentration of toxic gases is numerical simulation and simulation based on fluid dynamics. This method takes several hours or even days from modeling to result analysis, and is not suitable for propulsion at launch sites that urgently need emergency rescue. agent storage warehouse

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