The leading edge shock wave near the center body

which is too intensive in axisymmetric basic flowfield

was separated into one curved shock and partial isentropic compression wave using the design method of controllable Mach number distribution.With a structure of four shock waves and four regions

the modified basic flowfield could improve compression efficiency obviously.The circular intake inward turning inlets for modified basic flowfield and common basic flowfield of two shock waves and three regions were designed

and also numerically studied to obtain the flowfield characteristics and general performance.The results indicate the modified inlet has similar flowfield characteristics for the basic flowfield.It features high compression ratio and mass flow capture capability for Mach number of 4.0 to 7.0

and the pressure ratio and total pressure recovery coefficient are 17.56 and 0.540

respectively

at the design point.Besides

the leading shock and converged isentropic compression wave attached the cowl lip in turn while the Mach number of incoming flow varied from high to low

increasing the mass capture ratio and decreasing the total pressure loss.Its overall performance is better than common one with 23.6% higher total pressure recovery coefficient at Mach number of 7.0 and 5.7% higher mass flow coefficient at Mach number of 4.0.