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引言 目前还不能直接求解粘性流体的Navier-Stokes方程,对于管内的粘性流动问题还没有成熟的求解方法。所以在设计喷管时,都是首先进行无粘流场的计算,得到位流型面,然后再考虑边界层效应的修正。 文献[3]、[4]、[5]中所见的修正方法,都把边界层对位流的影响看作是对壁面的位置和形状的改变,其改变量就是位移厚度。得到位流型面之后,通过求解动量积分方程,得到位移厚度,然后迭加到位流型面上,求得最终的物理型面。
INTRODUCTION At present, Navier-Stokes equations for viscous fluids can not be solved directly. There is no mature solution to the problem of viscous flow in tubes. Therefore, in the design of the nozzle, are the first non-viscous flow field calculations to obtain the bit-stream profile, and then consider the boundary layer effect correction. The correction methods seen in [3], [4] and [5] all consider the influence of the boundary layer on the bit stream as a change in the position and shape of the wall, and the amount of change is the thickness of the displacement. After the bit-stream profile is obtained, the displacement thickness is obtained by solving the momentum integral equation and then superimposed on the bit-stream profile to obtain the final physical profile.