surge-by-flow-disturbances-at-the-compressor-inletMany different flow disturbances at the compressor inlet cancause stalls.CannonPressure waves and hot gases fromthe canons or rockets can causestalls. Intake ductAdjustable compressor inletguide vanes are closed whenfiring cannons or rocketsEngineAFlugrichtungStall conditions at the fuselageBEngine intake duct of a modernfighter aircraft with an angledair inflowAngle of attackFlight directionCBoundary layerIntake flowFlight directionFlow disturbance due toangled inflow against thelipDStanding with side windStall danger CannonIntake ductLipSimple straightintakeSeparating plateFuselageabout 9 cm