Distortion Induced Engine Instability

ACTUATOR DISC aerodynamic AIAA Paper air intake aircraft airfoil amplitude analysis angle of attack ASME attenuation Axial Compressors Axial Flow axial velocity blade row boundary layer bypass ratio cascade characteristics chord circumferential distortion compressor operating compressor stall configuration constant correlations damping distorted flow distortion index downstream effect exit experimental flight flow coefficient flow field frequency increase ingestion inlet distortion inlet pressure input instability loss in stall Mach number mass flow measurements NASA nozzle oscillations parameters performance perturbations prediction pressure rise problem propulsion system radial distortion Reference resonance response rotating stall rotor blade shown in figure simulation speed stability margin stage stall pressure ratio static pressure stator steady steady-state supersonic surge line surge pressure ratio temperature distortion terminal shock time-division multiplexing total pressure distortion transient tube Turbofan Turbofan Engine turbojet turbulence undistorted unsteady upstream V/STOL vibration