热声谐振管非线性效应的实验研究

INVESTIGATION ON NONLINEAR EFFECT IN A THERMOACOUSTIC RESONATOR

线性热声理论的前提条件是小振幅假设 ,但是 ,实际热声热机的工作振幅大多超出了这个假设而工作于非线性区域。因而 ,实际热机具有很强的非线性特点。S .karpov[1] 和Atchley[2 ] 等人在理论上证明了热声效应存在非线性不稳定性饱和、起振模态选择等非线性行为。作者在自行研制的驻波热声谐振管实验中观察到了以上非线性现象 ,本文将介绍这些实验现象 。

Small amplitude hypthesis is the precondition of linear thermoacoustic theory.But the actual thermoacoustic system always works in the nonlinear regime because their amplitudes often overstep the small amplitude hypothesis.In the paper some nonlinear phenomena are observed in the experiments of standing wave thermoacoustic prime mover and the results are introduced and analyzed.