摘要
从流体力学的基本方程出发,导出了等截面管内具有平均流和线性温度梯度时的三维声传播方程,然后采用迭代法将其化成可用边界积分方程表示的形式,最后用边界元法求解。由边界元法计算消声器的四极参数,从而可预测传递损失等声学特性。文中计算了膨胀腔的传递损失,并与一维理论结果进行了比较.
The governing equation of three-dimensional sound propagation in an uniform duct with mean flow and linear temperataure gradient is derived,based on the foundamental equations of aerodyna- mics.By using the interation method,the sound propagation equation is expressed as the case which can be computed numerically with the boundary element method.The four-pole parametes of a muffler can be obtained using BEM,therefore the acoustic per.formance such as transmission loss can be predicted.The transmission loss of an expansion chamber has been calculated and compared with the result obtained by means of the one-dimensional theory.
出处
《计算物理》
CSCD
北大核心
1996年第1期1-6,共6页
Chinese Journal of Computational Physics
基金
黑龙江省自然科学基金资助课题
关键词
声传播
平均流
温度梯度
边界元法
Sound propagation
Mean flow
Temperature gradient
Boundary element method
