Eighth International Symposium on Turbulence and Shear Flow Phenomena
DOI: 10.1615/TSFP8
NUMERICAL INVESTIGATION OF THE LAMINAR-TURBULENT TRANSITION IN A M=4.6 FLAT-PLATE BOUNDARY LAYER FORCED BY WALL INJECTION
pages 1-6
DOI: 10.1615/TSFP8.2250
摘要
The laminar-turbulent transition of a Mach 4.6 flat-plate boundary layer forced by a wall under-expanded jet is investigated using Implicit Large Eddy Simulation based on a 5th order WENO scheme. Two free-stream unit length Reynolds numbers, 6 and 16 million, are considered. The effects of injection pressure and temperature on the structure and the stability of the near-injection flow are investigated. Downstream breakdown to turbulence is analyzed through Q-criterion visualization, mean velocity profiles and wall parameters. Results show that a low-pressure injection is sufficient for effective tripping, and that a cold injection is more efficient to promote transition.