锥型热声谐振管内非线性声场的数值模拟研究

Numerical simulation of nonlinear acoustic field in a conical resonator

从声学角度出发,考虑粘性耗散、非线性效应及管型结构变化的影响,利用伽辽金法,对锥型热声谐振管内的一维声场进行了数值模拟研究,对谐振管结构参数对声场的影响进行了分析,给出了锥型管内压比随谐振管结构参数变化的规律,通过与圆柱型直管的比较,揭示了锥型管在抑制谐波及提高压比等方面的优越性。

From an acoustic point of view, using Galerkin method to solve the one dimensional model which considers viscous dissipation, nonlinear effect and structural change, the sound field in a thermoacoustic resonator is studied numerically. The influences of the structural parameters on the acoustic field are analyzed. The change of the pressure ratio with the structural parameters are given. The advanges of the conical resonator in inhibition of harmonics and increasing pressure ratio are revealed by comparison with a cylindrical resonator.