More Tests with a Variable Ramp Intake having a Design Mach Number of 2.2

SUMMARY Results are repvted of tests on a two-dimensional combined external/internal compressIon Intake having a design Mach number of 2.2. The particular parameters investigated in the tests now reported are:-(a) sidewall bleed, (b) a 3 to 1 range of free stream Reynolds number, (cl the length of subsonic diffuser, Cd) sidewalls out back to the line of the second ramp shock. The maximum pressure recovery obtained at the design Mach number was 90.9 per cent with 6.4 per cent bleed. A better performance was a pressure recovery of 90 per cent with only 3.4 per cent bleed. These fz@res were obtained at a Reynolds number, based on free stream conditions and intake capture heqht of 3.25 x 10". It seems possible that these pressure recoveries may be close to the maxunum attainable at Mach 2.2 in a mixed compression xntake of acceptable mechanical complexity, and employing a sunple four shock system.