管内声传播非线性效应及反声影响的数值研究

A Numerical Study of Nonlinear and Anti-sound Effects of Sound Propagation in Ducts

本文提出了包括考虑反声效应的一种数值方法来计算跨声速变截面硬壁管道内无声激波非线性声传播问题。通过许多算例,详细讨论了管道形状,喉部流动马赫数,入口声源强度及反声源强度对非线性声传播影响。算例表明,确实存在最佳反声强度,这时管道出口可得到明显的声衰减效果。

A numerical method considering anti-sound effects is proposed to calculate nonlinear sound propagation in varying area hard-wall ducts with transonic flow and without acoustic shock waves. By means of numerical examples, the effects of duct shapes, throat flow mach numbers, inlet sound source intensities and anti-sound intensities on nonlinear sound propagation are discussed in detail. It is also shown from the exmples that there does exist optimum anti-sound intensity at which the remarkable sound attennuation can be obtained at exit of the duct.