The pressure distribution along the compression surface is extracted from our simulation to compare with their available experimental data, shown in Figure 3(b) where a nice agreement can be observed, which also promises the accuracy of the adopted numerical methods for hypersonic inlet flow.
Caption: Figure 3: (a) Configuration of the hypersonic inlet model GK01 extracted from  for validation.
Chen, "A new understanding of hypersonic inlets' startability criterion," Journal of Propulsion Technology, vol.
"Mach 4 performance of hypersonic inlet
with rectangular-to-elliptical shape transition," J.
There have been many papers devoted to hypersonic inlet unstart, while most of literature studies treat it as a steady state flow phenomenon [5-9] Yu et al.
The 3D view of a multiple-modules hypersonic inlet is presented in Figure 1.
The multiple-modules hypersonic inlet is designed as a mixed-compression type, including three external shocks and two internal shocks.
These typical cross sections will be used to analyze the unstart coupling mechanism of the multiple-modules hypersonic inlet.
At a higher throttling ratio, the hypersonic inlet buzz appears.
The separation of the boundary layer is critical for a hypersonic inlet operation because it induces changes in shock wave angle and in pressure recovery as well as increments in heat transfer while it may lead to chocked flow, resulting in flow spillage and even in unstart of the engine .
Goss, "Combined magnetohydrodynamic and geometric optimization of a hypersonic inlet," International Journal of Aerospace Engineering, vol.
Over the last few years, development of hypersonic MHD applications has begun to cluster into flow control, hypersonic inlets
, and power generation [24-26].