电动泵压式液氧煤油变推力火箭发动机动力学建模与仿真分析: Part I-单点工况分析

doi:10.7527/S1000-6893.2021.24884

Abstract

Abstract: LOX/RP1 variable thrust liquid rocket engines using a motor pump have been widely studied in recent years because of their environmentally friendly performance, adjustable throttling depth and convenient adjustment. As a kind of variable thrust rocket engine, its system response characteristics are critical in directly determining the spacecraft maneuverability. However, previous research on the LOX/RP1 variable thrust engine using a motor pump mainly focuses on the system scheme design, and the dynamic analysis is relatively preliminary. In this paper, the response characteristics of the throttling system under different conditions and the variation of system performance parameters with the thrust level are studied by establishing a simulation platform of the LOX/RP1 variable thrust engine using a motor pump in consideration of the influence of the battery, motor and cooling channel. The results show that, although the response speed of the motor pump is fast, that of the cooling channel parameters is slow, leading to a short board effect. That is, the response time of the system performance parameters is ten times more than that of the motor pump speed. Contrarily, under low operating conditions, reducing the mixing ratio can ensure the smooth regulation of the thrust when the cooling channel outlet is in subcritical condition. Therefore, to improve the response characteristics of the system, the flow velocity in the cooling channel should be increased as much as possible when the pressure drop requirements are met.

Key words: LOX/RP1, motor pumps, variable thrust, liquid rocket engines, system dynamics, modeling and simulation, cooling channels

CLC Number:

V435

CUI Peng, SONG Jie, LI Qinglian, CHEN Lanwei, LIANG Tao, SUN Jun. Dynamic modeling and simulation analysis of LOX/RP1 variable thrust engines using motor pump: Part I-single condition analysis[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(1): 124884-124884.

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Dynamic modeling and simulation analysis of LOX/RP1 variable thrust engines using motor pump: Part I-single condition analysis

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