Effects of Optimized Bleed System on Supersonic Inlet Performance and Buzz

摘要

This paper details the numerical investigations of bleed effects on supersonic inlet performance and buzz undervarious bleed conditions, including location, width, plenum static pressure, and inlet conditions (for example, inflowMach number and throttling ratio).Ableed boundary condition model that reflects the effects of local flow expansionand porosity variation is proposed and validated. Flows around a supersonic inlet with bleeds are computed to showbleed effects on the inlet performance and buzz. By employing metamodeling in conjunction with a genetic algorithm,an optimal bleed condition maximizing the total pressure recovery is obtained, for each Mach number and throttlingratio, in the air chamber. A bleed condition that provides better performance for all Mach numbers and throttlingratios in the subcritical inlet operating range is then obtained by multipoint design optimization. Numerical resultsshow that the optimal bleed condition, obtained by the multipoint design optimization, provides a much widersubcritical stable range for enhanced inlet operation by substantially increasing the total pressure recovery andsuppressing inlet buzz.