“…Shock tunnels were also used by Frost et al (2009) and Laurence et al (2013Laurence et al ( , 2014 to investigate choking and incipient shock train propagation in a model of the HyShot scramjet engine. Thermal choking studies on rectangular supersonic combustors were also performed by Mashio et al (2001) and Owens et al (2001) using direct-connect continuous-flow vitiated tunnels. Do, Passaro & Baccarella (2012), Liu et al (2014) and Im et al (2016) studied combustion-induced unstart in a pulsed freejet-type arc-heated tunnel with 1 second test time.…”