Numerical Study of Characteristics of Gas Liquid Coaxial Injector as Acoustic Resonator

doi:10.16182/j.issn1004731x.joss.201703020

Abstract

Abstract: The gas-liquid injector of the rocket engine was simplified to a quarter-wave resonator and a half-wave resonator respectively by adopting linear acoustic analysis. Acoustic-damping effect of the length and inlet jet of the injector on the first tangential mode of the chamber was found for ambient condition. It is found that when the first order longitudinal mode frequency of the injector is equal to the acoustic mode frequency of the combustion chamber intended for damping, for the inlet jet is choked, the optimum length of the injector to maximize damping capacity is near quarter of a full wavelength of the first longitudinal mode traveling in the injector with the acoustic frequency intended for damping, on the contrary, the length of the injector is near half of a full wavelength of the first longitudinal mode traveling in the injector. The research results can provide reference for the optimum design of the length and inlet jet of the injectors, and acoustic damping of the combustion chamber.

Key words: gas liquid coaxial injector, acoustic resonance tube, acoustic damping coefficient, numerical calculation

CLC Number:

An Honghui, Nie Wansheng. Numerical Study of Characteristics of Gas Liquid Coaxial Injector as Acoustic Resonator[J]. Journal of System Simulation, 2017, 29(3): 618-623.

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