Unstart Coupling Mechanism Analysis of Multiple-Modules Hypersonic Inlet

Nonlinear Adaptive Dynamic Inversion Applied to a Generic Hypersonic Vehicle

Flight control of hypersonic vehicles is challenging because of the wide range of operating conditions encountered and certain aspects unique to high speed flight. A particular safety concern in hypersonic flight is the risk of an inlet unstart, which not only produces a significant decrease in thrust but also results in a change to the aerodynamics and thus can lead to the loss of the vehicle....

A numerical study of the unstart event in an inlet/isolator model

Linear stability analysis of the onset dynamics of scramjet unstart

Recently, interest has increased in using scramjet engines as a means of long-range high-speed flights and economical access to outer space. One of the most perilous causes of scramjet malfunctions is the unstart event that is initiated by excessive heat release from combustion. When unstart occurs, a strong moving-shock structure is first formed in the engine, and the shock structure propagate...

Bifurcation analysis of scramjet unstart

Scramjet unstart occurs when a strong shock initiated from disturbances in the engine propagates upstream and finally spills out of the engine inlet. When unstart occurs, the airflow into the engine is greatly diminished, leading to loss-of-thrust and engine stall. Because the probablility of unstart increases with increasing heat-release, the danger of unstart is an important limiting factor o...

Dynamics and Control of Shock Motion in a Near-Isentropic Inlet

Inlet pressure recovery of supersonic aircraft could be improved using a near-isentropic inlet with only a weak normal shock aft of the throat; however, such an inlet is highly susceptible to unstart. Small perturbations can move the shock ahead of the throat, where it is unstable. The dynamics of the inlet and shock are analyzed using a low-order model that captures both the nonlinear shock mo...