Design method for air supply flow of low-temperature liquid rocket blow-off branch pipe

Abstract

The invention relates to a design method for the air supply flow of a low-temperature liquid rocket blow-off branch pipe. Comprising the following steps: determining the temperature of a propellant, geometric parameters of a cabin section and physical property parameters of materials forming the cabin section according to total input, and determining a target average temperature designed by air in the cabin section; according to the total input, determining the environment temperature and the ground average wind speed of the launching day; according to the input parameters, calculating the convective heat transfer coefficient outside the bulkhead; valuing the convective heat transfer coefficient in the bulkhead; building a cabin section thermal grid model; and establishing a heat balance equation based on the gas supply flow min for each heat grid, and performing simultaneous solution according to the input conditions of the steps to obtain the gas supply flow. The design method is rapid, simple and convenient, the design result precision is high, the branch pipe air supply flow can be rapidly calculated according to the environment condition of the launching day and equipment parameters of the rocket cabin section, input conditions are provided for ground air supply and distribution, and therefore the temperature environment of cabin section single-machine equipment is guaranteed.

Description

Technical field [0001] The present invention relates to the field of liquid rocket thermal environmental design, and more particularly to a design method of low temperature liquid rocket blowing away from branch gas supply flow. Background technique [0002] The small low-temperature rockets are vertically until the launch, and some spaces such as the box segment will be affected by the low temperature propellant in the tank. The average temperature of the cap may be reduced to less than a few decades, and the temperature environment may make the space. The single machine device does not work properly or damage, so it needs to improve the heat environment by blowing the system before the shooting system. [0003] The blowout system typically includes a surface supply gas apparatus, a conveying line, and a branch pipe, which supplies a hot nitrogen such as hot nitrogen after heating by the ground supply gas apparatus, and then transports to the desired space by the delivery line. ...

AI Technical Summary

Problems solved by technology

[0004] Generally, the design of the air supply flow rate of the blow-off branch is usually to build a set of test products, which are determined through tests. This design process is relatively complicated and not universal.

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