Laminar Mixing of Two Streams in a Pressure Gradient

Résumé du livre

An analytical study was made of the laminar mixing between a gas stream ejected from the nose of a body and a shocked free stream. The physical problem was broken down into three regions of flow, one involving free mixing in the vicinity of the stagnation point, another in which the mixing layer interacts with the body surface, and a third in which viscous effects have diffused throughout the ejected flow. Only the first region was treated in detail. An approximate analytic method was developed to solve the mixing layer flow. The method allows nonsimilar mixing, variable fluid properties, and coupling between the governing equations. A comparison between results of this approximate method and exact numerical solutions for both similar and nonsimilar flows indicates very good agreement. The results for the velocity, shear, enthalpy, and enthalpy gradient at the point where the stream function is zero differ by about 3% in most cases, by 10% in the worst cases. The approximate method also predicts the variation of the flow quantities across the mixing layer very accurately.