A small flow precooling system in microgravity environment

Abstract

The invention provides a low-flow pre-cooling system in a microgravity environment. Using the capillary action of the screen structure, the low-flow liquid propellant can be filled into the fluid management device; at the same time, this part of the filled low-temperature liquid propellant is The internal cooling heat exchanger is cooled to a subcooled liquid; this part of the subcooled liquid propellant is supplied to the engine precooling system. The present invention can realize the small-flow precooling of the low-temperature engine before multiple startups in the space environment under the space microgravity environment, and is applicable to various precooling schemes, including exhaust precooling, immersion precooling and cycle precooling. The space microgravity environment pre-cooling technology of the present invention does not require the conventional auxiliary propulsion system to provide positive thrust at the bottom, which can save conventional propellant consumption; in addition, the quality of pre-cooled low-temperature propellant is improved to ensure the normal start-up and pre-cooling of the circulating pre-cooling pump The process does not entrain gas, improving overall performance and reliability.

Description

technical field [0001] The invention belongs to the field of design and manufacture of a microgravity low-temperature fluid delivery system, and in particular relates to a small-flow precooling system in a microgravity environment. Background technique [0002] During the start-up process of the low-temperature propulsion engine, the temperature of the engine system shell is required to be lower than the saturation point of the propellant to avoid cavitation of the low-temperature propellant in the turbo pump during the start-up process. Therefore, it is necessary to pre-cool before starting to meet the temperature requirements of the engine turbine pump body, avoid cavitation in the pump chamber, and ensure safe start. Pre-cooling is an important sequence before the low-temperature engine is started. Ground pre-cooling mainly uses the low-temperature propellant in the storage tank to cool the engine casing to the required under temperature conditions. However, for the pre...

AI Technical Summary

Problems solved by technology

[0003] There are the following problems in carrying out engine precooling with the help of conventional auxiliary propulsion system forward propulsion sinking management: (1) For multiple starts in the space environment, the total time of precooling and forward thrust sinking management will increase, resulting in an increase in the consumption of auxiliary propellant for forward propulsion , the overall performance is reduced; (2) the auxiliary propulsion system has a small forward thrust sinking overload, and the dispersed bubbles are carried into the engine with the liquid propellant, and the bubbles may accumulate in the engine casing, which is difficult to discharge, which will affect the safe start of the engine; (3 ) space environment, environmental heat leakage and engine parasitic heat leakage will lead to the evaporation of low-temperature propellant, the dryness of the propellant two-phase flow will increase, and the cooling rate of the cooling pipeline will be slow

Therefore, none of the above schemes is suitable for precooling of low-temperature power systems under the condition of space without forward thrust and bottom sinking.

Images