Integral Solution for Boundary Layers with Large Blowing

摘要

The compressible, laminar boundary layer with surface blowing is investigated by the momentum integral technique. The unique feature of the study is that velocity and enthalpy profiles are derived from a consideration of momentum and energy equations near the wall. This procedure provides general and accurate profiles, but it biases the solution toward moderate and large blowing limits. Approximate solutions are obtained for self-similar flows, and the effects of pressure gradient and surface temperature are discussed. It is shown that the wall shear can be zero for a finite amount of blowing either when the pressure gradient is zero, which is well known, or when the wall temperature is zero, which is believed to be a new result. Detailed calculations of flow over a flat plate are presented for self-similar and uniform blowing distributions. These results compare favorably with the exact calculations. (Author)