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对于无流动的驻波管,侧向加入Helmholtz共振器已经被证实是降低火箭或涡轮发动机燃烧室燃烧噪声的一种好的新方法。但实际情况在燃烧室内是有低速流动的,本文对这种侧向具有Helmholtz共振器又有流动驻波管内的声场进行理论分析,建立相应的数学物理问题,并进行求解,包括:(1)建立有流动驻波管和Helmholtz共振器连接处的间断条件。(2)提出同时计及流动、共振器喉部粘性和多孔影响的Helmholtz共振器声阻抗计算公式。(3)建立驻波管末端反射条件。上述理论工作已得到实验证实。
For flow-free standing wave tubes, lateral addition of Helmholtz resonators has proven to be a good new way to reduce the combustion noise in a rocket or turbine engine combustor. However, the actual situation is that there is a low-speed flow in the combustion chamber. In this paper, the acoustic field in the lateral Helmholtz resonator and the standing wave tube is analyzed theoretically, and corresponding mathematical physics problems are solved and solved. These include: (1) The establishment of the flow of standing wave tube and Helmholtz resonator junction intermittent conditions. (2) The formula for calculating the acoustic impedance of Helmholtz resonator, which considers both the flow and the laryngeal viscosity and porosity of the resonator, is proposed. (3) The establishment of standing wave tube end reflection conditions. The theoretical work has been experimentally confirmed.