Refraction of sound by a shear layer
Refraction of sound by a shear layer
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DOI：
10.1016/0022-460x(78)90353-x
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发表时间：
1977-01
影响因子：
4.7
通讯作者：
R. Amiet
中科院分区：
文献类型：
--
作者：
R. Amiet
对几种剪切层折射理论进行了比较，以确定它们之间的关系，并确定哪些参数对开式射流风洞剪切层修正是重要的。对于通过平行剪切流的声传输，剪切层厚度被发现是不重要的马赫数典型的开放式射流隧道。反射波的影响，虽然更显着，通常可以忽略不计，允许校正是独立的源类型和频率。剪切层形状（平面或圆柱形）可能很重要，应使用与实际剪切层形状相对应的校正。厚剪切层和薄剪切层的极限情况下的Lilley方程的数值解被发现同意这些极限情况下给出的代数表达式。
A comparison is made between several shear layer refraction theories to determine their relationship to one another and to determine which parameters are important for an open jet wind tunnel shear layer correction. For sound transmission through a parallel sheared flow, the shear layer thickness is found to be unimportant at Mach numbers typical of open jet tunnels. The effect of reflected waves, although more significant, can usually be ignored, allowing a correction which is independent of source type and frequency. The shear layer shape (plane or cylindrical) can be important and the correction corresponding to the actual shear layer shape should be used. The numerical solutions of the Lilley equation for the limiting cases of a thick and a thin shear layer are found to agree with the algebraic expressions given for these limiting cases.