03.2 - Experimental Aerodynamics
MECHANISMS OF SCREECH MODE STAGING IN UNDEREXPANDED SUPERSONIC JETS
S. Mazharmanesh¹, J. Weightman¹, P.A.S. Nogueira¹, D. Edgington-Mitchell¹; ¹Monash University, Australia
This study investigates the mechanism governing A1–A2 screech staging in an underexpanded supersonic jet using high-speed schlieren imaging and Hilbert proper orthogonal decomposition. The results show that nonlinear mean-flow modification changes the shock-cell spacing to satisfy the resonance condition of the alternate mode, revealing the physical mechanism responsible for screech mode staging.