Research On The Combined Power Internal Rotation Adjustable Inlet

In recent years,more and more attention has been paid to the three-dimensional inward turning inlet,which is a hypersonic inlet with good performance.Hypersonic vehicles often need to work in a wide speed range,and the adjustable inlet is bound to be the future development trend.This paper mainly studies the three dimensional adjustable internal turning inlet,and mainly designs the single channel of inward turning inlet which can work in a wide speed range.First,this paper studies the influence of entry shape of inward turning inlets characteristic,we designed three inlets,they are rectangular entry,trapezoid entry and semi-circular entry,we designed inward turning inlets with forebody and without forebody,using numerical simulation method to calculate the performance parameters of inlets under different working conditions,studying the effect of entry shape on starting characteristics of inward turning inlets and the performance of the inlets at high Mach numbers,finally by expanding the throat to improve the starting ability at low Mach numbers.The results show that the semi-circular inlet has better starting ability and higher total throat pressure recovery coefficient at high Mach numbers.Secondly,this paper studies the starting characteristics of the variable geometry inlet of the rotating cowl.The rotating cowl can adjust the entry area of the inlet,increase the overflow,and reduce the lower starting Mach number of the inlet.Two kinds of adjustment methods were adopted to simulate and analyze the rotation of different amplitude at low Mach numbers.Finally,the model was optimized to improve the parameter performance of the inlet.Finally,this paper studies the design method of arc plate as the forebody to the inlet,we designed convex surface and concave surface of two kinds plates,we found that the convex surface is more appropriate as the forebody of inlet by using numerical simulation calculation,its initial compression Angle is greater than the end of the compression Angle,we can control the position of the forebody shock wave into the channel by changing the forebody of curvature coefficient,finally summarizes the forebody of convex surface curvature coefficient on the overall performance of the inlet.