Body-Vortex Interaction, Sound Generation, and Destructive Interference
Body-Vortex Interaction, Sound Generation, and Destructive Interference
复制标题
体涡相互作用、声音产生和破坏性干扰
作者：
H. Kao
一般认为，涡流与下游叶片的相互作用是产生噪声的主要来源。本文提出了一个二维无粘流模型和匹配渐近展开法来数值分析这个问题。采用匹配渐近展开法将不可压流的内部区域与可压流的外部区域进行匹配。由于不可压缩性，相对简单的数值方法可用于处理多涡和任意形状的多个物体。来自旋涡和物体的扰动以声波的形式向外传播。由于它们的相互作用，可能会产生相长干涉或相消干涉。当它是破坏性的，组合的声音强度可以降低，有时大大降低。此外，给出了级联-vonex相互作用声产生的解析解。
It is generally recognized that interaction of vortices with downstream blades is a major source of noise production. To analyze this problem numerically, a two-dimensional model of inviscid flow together with the method of matched asymptotic expansions is proposed. The method of matched asymptotic expansions is used to match the inner region of incompressible flow to the outer region of compressible flow. Because of incompressibility, relatively simple numerical methods are available to treat multiple vortices and multiple bodies of arbitrary shape. Disturbances from vortices and bodies propagate outward as sound waves. Due to their interactions, either constructive or destructive interference may result. When it is destructive, the combined sound intensity can be reduced, sometimes substantially. In addition, an analytical solution to sound generation by the cascade-vonex interaction is given.