Boundary Layer Variation Rule and Influence Analysis
Due to the viscous action of air flow,the inlet boundary layer forms a low-speed zone with a certain gradient on the surface,in which the position close to the wall is basically in a stagnant state.The presence of low speed zone affects the flow area of the inlet,the total pressure recovery coefficient of the inlet,the inlet flow measurement and the overall performance.With the diversification of aircraft flight attitude and the continuous expansion of flight envelope,the existence of inlet boundary layer reduces the engine surge margin,which affects the flight safety in serious cases.By studying different methods of boundary layer measurement,this paper ana-lyzes the velocity distribution of boundary layer and the variation rule of boundary layer thickness,and calculates the impact on compression components,and then evaluates the impact on the overall performance of the engine.
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万方数据
