Investigation of the Effect of Flare and Ramp Angle on the Upstream Influence of Laminar and Transitional Reattaching Flows from Mach 3 to 7

摘要

An experimental investigation of laminar- and transitional-flow separation induced by flares and ramps of different angles was conducted at Mach numbers 3, 5, and 7 over a broad Reynolds number range. Surface pressure distributions, schlieren and shadowgraph pictures, and the oil film technique were used to determine the effect of transition during flow reattachment on the scale of laminar separation. It is concluded that because transition was always triggered prematurely by the reattachment pressure gradient, small flow deflections (theta