Design and Regulation of Two-dimensional Variable Geometry Hypersonic Inlets

A variable geometry inlet with a rotating cowl operating in a large Mach number range with large angles of attack is studied through numerical simulation,which yields a design method of the baseline variable geometry inlet with high performance and a law of performance variation and regulation under different conditions.The result shows that: the variable geometry inlet with curved cowl has better performance and flow field structure in the large Mach number range.The variable geometry inlet designed at Mach number Ma=6.0 with a rotating cowl can realize self-start at Ma=4.0 without the boundary layer diverter,and the lowest Mach number of self-start is Ma=3.5.The cowl can maintain the normal working of the inlet by rotating properly to control the average Mach number of the throat at low incoming Mach numbers with large angles of attack.