DOI: 10.1615/TSFP2
TRANSITION OF SUPERSONIC PLANE JET DUE TO SYMMETRIC/ANTISYMMETRIC UNSTABLE MODES
SINOPSIS
Results from linear stability analysis are presented for widely variety of top-hat plane jets, including viscous effects and high connective Mach number plane jets. It is found that the dominant mode is 2-D antisymmetric mode for Mc less than 0.8, 3-D antisymmetric mode for Mc larger than 0.8 and less than 1.5, and 2-D symmetric mode (S2) for Mc larger than 1.5. Direct numerical simulations of spatially developing 2-D and temporally developing 3-D are performed using high-order compact schemes. 2-D DNS and stability analysis show that S2 instability mode nature prohibits vortex pairing in the flow field for high Mc numbers. 3-D simulations for Mc=1.13 show sound field are observed when (0,2) modes become dominant after saturation of oblique modes.