Nan Li  , Kejng Xu  , Yanping Song

DOI Number XXX-YYY-ZZZ

Conference Number HiSST 2018-1

The behaviours of the shock train, associated with the separation flow within it, depend on not only the incoming flow conditions but also the characteristics of the boundary layer heavily. Understanding the sensitivity of the shock trains to the near-wall flow is also useful for controlling the movement of the shock train. The hysteresis characteristic of a shock train in an isolator has been investigated in a direct-connect wind tunnel. High-speed Schlieren imaging and high-resonance frequency pressure measurements were used to capture the flow features during the movement of the shock train. With the upstream movement of the shock train, the rapid movement of the shock train leading edge (STLE) can be observed near the shock wave-boundary layer interaction (SWBLI) region. To examine the bistability and route dependent behaviour of the shock train, the backpressure was driven to decrease along the same route it increases. The results indicate that with a same pressure ratio, the shock train leading edge could be either downstream or upstream of the SWBLI region. The hysteresis behaviour of the shock train was also confirmed.

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In Categories: HiSST 2018, Hypersonic Aerodynamics
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