Study On Boundary Layer Flow In Supersonic Blunt Wedge

For the aircraft,the aerodynamic shape of the forecast is very important,it can be said to occupy the majority of the aircraft design.However,the influence of roughness on aerodynamic shape of the aircraft is very large so that the study of the aerodynamic shape under the influence of the rough element is very important.In this paper,the fluent software is used to study the flow of the boundary-layer with different roughness and different roughness elements.Through the research,we know that :The thermodynamic properties at the head and near the leading edge show the most significant growth trend because of the shock wave.It is worth noting that the thermal properties of the trailing edge show the same trend as the head in the absence of roughness,however,there were no significant changes in the thermodynamic properties at the six different roughness heights.The roughness effectively suppresses the flow backflow and the roughness makes the wall thermodynamic parameters have a significant amplification.But whether the roughness is the key and the height of the roughness has little effect on it.When there is a single convex or concave roughness on the upper wall the flow of the upper wall is greatly affected by the rough element.The effect of unilateral sag on the surface spoiler is more complex than that of a single raised raster element,and the thermodynamic properties should be better than a single bulge.When there are two rough elements on the upper wall the variation of wall flow parameters is similar to that of the same type of single roughness element.The difference is that the thermodynamic properties of the wall parameters are the largest in the first roughness element except for the kyphosis,and then gradually decreased.However,the thermodynamic properties of the wall flow reach the maximum in the raised roughness segment in the anterior concave kyphosis of the arrangement.In addition,if the arrangement is different types of rough elements the trailing edge of the concavity is affected by the raised roughening element,and the flow does not fluctuate as in the case of a single recess.The former roughening element suppresses the effect of the latter element on the spoiler,but on the contrary can be ignored.