Propulsive jet aerodynamics and aeroacoustics

Abstract Comprehensive understanding of propulsive jet aerodynamics and aeroacoustics is key to engine design for reduced noise infra-red signature in civil military aerospace, respectively. Illustrated examples are provided other aerodynamic/aeroacoustic problems involving development, including chevron nozzles, increased jet/wing/flap interference (as fan diameter increases), high acoustic environment (and potentially damaging screech) supersonic jets on carrier decks the strongly Three-Dimensional (3D) unsteady flow during in-ground effect operation Short Take-Off Vertical Landing (STOVL) aircraft. To date, laboratory/rig test measurements have primarily been used identify solutions; use Computational Fluid Dynamics (CFD) would help achieve cost/time reductions, but Reynolds-Average Navier–Stokes (RANS) CFD with statistical turbulence modelling has proven inadequate such flows. The scenarios described far removed from flows calibrate model constants, predictive accuracy demands detailed insight into flow. Large-Eddy Simulation (LES), whilst computationally more demanding, offers a potential solution. Research undertaken assess LES capability address challenges reviewed here. This demonstrates that tremendous progress made, indicating can provide sufficiently accurate predictions, representing value engineering design. A series validation studies increasing realism practical systems presented underpin this conclusion. Finally, areas further work suggested support combined application RANS probably optimum way forward.