中文摘要：

采用Fluent软件模拟研究了m=2.2的指数型热声谐振管内二维非线性声流场特性。通过与两种圆柱型直管的比较,验证了指数管具有提高声压和抑制高次谐波的能力,并对指数管内声场流场特性进行了分析。研究发现：指数管能显著提高管内压力,获得较大压比,能有效地抑制高次谐波;同时,指数管内声场的压力节点偏离了中心位置并存在可观的二次谐波,表现出非线性声振荡特征,并且流场中会发生＂速度环形效应＂。

英文摘要：

The two-dimensional nonlinear acoustic field of exponential shaped resonator of m=2.2was simulated with Fluent.The ability of exponential tube in increasing sound pressure and inhibition of harmonics was verified and the features of acoustic and flow field of it were analyzed.It is found that the pressure and pressure ratio of exponential resonator have been improved and it has less high-order harmonics.Meanwhile,the pressure node of acoustic field is offset from the center position and it has a large second-order harmonic.It is also found that the velocity annular effect occurrs in flow field of exponential resonator.