基于燃气射流冷凝的氧路系统频率特性研究

doi:10.7527/S1000-6893.2019.23393

Abstract

Abstract: Based on the one-dimensional thermodynamic disequilibrium two-fluid six-equation model, the condensation of gas jet is simulated. The simulation happens in the pipeline between pumps of the liquid oxygen/kerosene staged combustion cycle rocket engine system, obtaining the characteristic parameters along pipeline flow direction. Firstly, based on Rayleigh-Plesset equation and the characteristics of gas jet and condensation distribution, a transfer function model is established. The condensation model with liquid oxygen pipeline, pump, and other component models are solved simultaneously, and the frequency characteristics of oxygen pipeline system of the engine are analyzed. Secondly, the influence of gas jet and condensation process on the frequency characteristics of the oxygen feed system at different inlet pressure levels and liquid oxygen temperature boundary conditions are studied. The simulation results show that the high inlet pressure and subcooling liquid oxygen changes the inertia and flexibility of jet bubble, and increases the characteristic frequency of the oxygen feed system. The engine firing test results under different boundary conditions show that increasing the oxygen feed system inlet pressure or decreasing the liquid oxygen temperature increases the frequency of oxygen feed system from 8.3 Hz to 11 Hz. The result is consistent with the numerical simulation results, verifying that gas jet and condensation of pump pipeline is an important process affecting the frequency characteristics of the oxygen feed system.

Key words: oxygen feed system, frequency characteristics, gas jet, condensation, two-fluid model

CLC Number:

V434⁺.23

ZHANG Miao, LI Bin, XING Lixiang. Study on frequency characteristics of oxygen feed system based on gas jet and condensation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(2): 123393-123393.

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Study on frequency characteristics of oxygen feed system based on gas jet and condensation

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