考虑喷注流强分布的纵向稳定性建模与分析

doi:10.7527/S1000-6893.2020.24510

Abstract

Abstract: Apart from acoustic damping devices, injection intensity distribution is a main method for the stabilization of liquid rocket engines. Through injection intensity distribution control, propellant combustion moves far away from the node of the main acoustic mode, decreasing the coupled energy driving thermo-acoustic instability and thereby suppressing high frequency combustion instability. Therefore, it is highly significant to build a comprehensive analysis model between injection intensity distribution and instability. For the hypergolic sub-scaled combustor adopting a self-impinging injector and droplet vaporization as the rate-control process, the concentrated combustion zone can be approximately replaced by the area with the highest evaporation rate in analysis of high longitudinal combustion instability. To build a theoretical model for high longitudinal combustion instability considering injection intensity distribution and analysis of its instability suppression capability for injection intensity distribution, a three-dimensional thermo-acoustic equation for the combustion chamber with multiple injectors is introduced for spatial distribution of concentrated combustion response. Finally, the growth rates representing combustion instability of the first longitudinal mode with different injection intensity distributions are computed. Results indicate that the injector with higher injection intensity in the hump zone is more stable than that with lower intensity, with a typical result of 30% gain from injection intensity in the hump zone leading to a 15% reduction in the growth rate.

Key words: hypergolic propellant, droplet evaporation, injection intensity distribution, combustion response, three-dimensional acoustics, longitudinal stability, growth rates

CLC Number:

V434.4

WANG Guangxu, TAN Yonghua, CHEN Jianhua, ZHUANG Fengchen, HONG Liu, CHEN Hongyu, YANG Baoe. Modeling and analysis of longitudinal stability considering injection intensity distribution[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(6): 124510-124510.

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Modeling and analysis of longitudinal stability considering injection intensity distribution

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