Simulation model of the three-dimensional magnetohydrodynamic (MHD) enhanced scramjet viscous inner flow field was established. Geometry of a scramjet applied both MHD controlled inlet and MHD energy bypass was designed at Ma=6. Numerical simulation was performed

and three-dimensional flow field structure

distribution pattern of the electric parameters

and characteristics of energy transformation were analyzed. The results show when flight Ma=8

MHD controlled inlet can be used to draw the compressive shock waves back to the cowl lip

the separation zone disappears

and the flow field of the inner inlet recovers to the design condition. The MHD energy bypass can decrease Ma of the flow before combustor efficiently

so as to improve engine performance. In the MHD generator

distributions of flow and electric parameters are comparatively ideal to make efficient effect

while the MHD accelerator needs large amount of energy input to make a significant acceleration. In the MHD accelerator

Joule heating dissipation is severe near the electrodes

which results in local high temperature

flow field complication and performance deterioration of the MHD accelerator.