Effects of jet exhaust on engine inlet distortion during carrier-based aircraft takeoff

During carrier-based aircraft takeoff, the jet exhaust interacts with the jet blast deflector, generating backflow that affects the intake conditions of the aircraft engine and increases the risk of engine surge and failure. To investigate the characteristics of the jet exhaust backflow, a flow field study was conducted for the carrier-aircraft system during the takeoff phase. A delayed detached-eddy simulation turbulence model coupling the exhaust concentration and temperature fields was developed to examine the temperature and total pressure distortion at the engine aerodynamic interface plane under the influence of carrier wake disturbances. The effects of wind direction and deflector angle on inlet distortions were quantified. The results indicate that the maximum temperature distortion at the engine inlet occurs under headwind navigation conditions. Ingestion of high temperature exhaust reduces the average gas density, leading to a 23.1% reduction in mass-flow rate and an 8.6% decrease in oxygen concentration. As the wind direction angle increases, the exhaust backflow deflects, resulting in reduced temperature distortion at the engine inlet and decreased fluctuations in pressure distortion amplitude.