\The compressibilty correction rule for thin wing The effect of compressibility in 3-D flows is somewhat less dramatic than with 2-D flows, but many of the same effects become important. Many of the same techniques for predicting linear compressibility effects work in 3-D too. For example
在3.2.2节中介绍低速风洞时,我们首次介绍了风洞 扩压器(扩压段)的作用。在那里,扩压器是试验段下 游的一段扩张管道,作用是将试验段的气体的高速度降 低至扩压器出口的很低速度。一般来说,我们可以将扩 压器定义如下:扩压器是将入流速度在其出口处降低的 任意管道(in general, we can define diffuser as any duct designed to slow an incoming gas flow to lower velocity at the exit of the diffuser)