High-pressure-helium obtaining method for liquid-hydrogen temperature zone

Abstract

The invention discloses a high-pressure-helium obtaining method for a liquid-hydrogen temperature zone and the method is mainly used for providing low-temperature helium for a ground test system of a carrier-rocket cold-helium pressurization system. An applied device mainly includes a liquid-nitrogen heat exchanger, an upper volute, titanium bottles, a lower volute and a liquid-hydrogen dewar. Each titanium bottle is provided with an upper opening and a lower opening, which are connected to the upper and lower volute respectively. The liquid-hydrogen dewar is a vacuum powder heat insulation structure. A preparation process of the low-temperature helium is as follows: firstly, the titanium bottles are filled with normal-temperature helium to XMPa and then liquid nitrogen and liquid hydrogen are injected to the liquid-nitrogen heat exchanger and the liquid-hydrogen dewar and then the titanium bottles are filled with helium which undergoes temperature reduction by the liquid-nitrogen heat exchanger so that the pressures of the titanium bottles rise to be slightly higher than XXMPa; the inflation is stopped and the helium is made to stand so as to reduce temperature and reduce pressure and then the titanium bottle inflation and standing processes are repeated until the pressures in the titanium bottles are stabilized to XXMPa without an obvious lowering trend; and if a needed helium temperature is lower than 21K, deflation of the titanium bottles can be carried out firstly after preparation of the XXMPa helium is completed and the helium can be used after the temperature is reduced to a needed value. The titanium bottle inflation and deflation structure is high in reliability and the titanium bottles can be used for a plurality of times and consumption of liquid hydrogen and helium in a test process is reduced so that an objective of reducing test cost and improving test security is achieved.

Description

technical field [0001] The invention relates to a method for obtaining high-pressure helium in the liquid hydrogen temperature zone, which is mainly used for the ground test of the cold helium pressurization system of the low-temperature storage tank of the hydrogen-oxygen rocket, and can simulate the process of obtaining and using the low-temperature high-pressure helium in the liquid hydrogen storage tank of the rocket It belongs to the test technology of the pressurized conveying system of the cryogenic rocket tank. Background technique [0002] my country's CZ-XX series launch vehicle X sub-stage engines use liquid hydrogen and liquid oxygen as propellants, and the pressure of the air pillow in the liquid oxygen tank is controlled by a cold helium pressure regulator. Due to the complex structure of the cold helium barometer, the difficulty in processing and comprehensive testing, and the existence of certain hidden dangers, it is difficult to meet the high-density launch...

AI Technical Summary

Problems solved by technology

Due to the complex structure of the cold helium barometer, the difficulty in processing and comprehensive testing, and the existence of certain hidden troubles, it is difficult to adapt to the high-density launch requirements of this series of rockets

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