液体火箭发动机高频纵向燃烧不稳定现象的随机性

doi:10.7527/S1000-6893.2023.29485

Abstract

Abstract:

A thorough investigation was conducted into the randomness of high-frequency longitudinal combustion instability in the combustion chamber of a hypergolic propellant liquid rocket engine. The effectiveness of structural vibration data in characterizing pressure oscillations in the combustion chamber was analyzed， and the theoretical acoustic mode and measured vibration mode compared. Based on the assumption of evaporation as the rate-control process， the stability of the combustion chamber was analyzed， and two hypothetical models proposed to interpret stability differences under different supply systems. Research has shown that： the response of the combustion chamber structure to the gas pressure oscillation field measured by the structural vibration sensor has certain frequency selectivity and nonlinearity； the measured predominant frequency amplitude distribution is basically consistent with the theoretical acoustic mode at this frequency， indicating that the combustion chamber has experienced high-frequency first-order longitudinal combustion instability； the linear model results indicate that the combustion chamber has a certain stability margin； however， it cannot explain the random occurrence of combustion instability under system 2 conditions； under system 2 conditions， the stability of the combustion chamber deteriorates or the amplitude of stability fluctuations between different operating conditions increases， causing some operating points to fall into the nonlinear instability range and become potential unstable operating conditions.

Key words: liquid rocket engine, high frequency longitudinal, combustion instability, supply system, randomness

CLC Number:

V434.4

Guangxu WANG, Baoe YANG, Yonghua TAN, Yushan GAO, Bin LI. Randomness of high frequency longitudinal combustion instability in liquid rocket engines[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(14): 129485-129485.

Figures/Tables 10

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Randomness of high frequency longitudinal combustion instability in liquid rocket engines

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