Investigation of the Effect of a Realistic Nozzle Geometry on the Jet Development

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Investigation of the Effect of a Realistic Nozzle Geometry on the Jet Development

Cetin, Mehmet Onur / Meinke, Matthias / Schröder, Wolfgang

Abstract Highly resolved large-eddy simulations (LES) of a helicopter engine jet including the nozzle geometry are performed. A flow solver for compressible flow based on hierarchically refined Cartesian meshes and a conservative cut-cell method is used for the computations. The impact of the nozzle geometry on the jet development is analyzed for two variants of the nozzle geometry, a simplified geometry with only a center body and the full geometry of the engine nozzle including four struts which support the center body. A synthetic turbulence formulation is used to prescribe inlet boundary conditions for the nozzle, which mimic the exit conditions after the last turbine stage. To verify the numerical method, a single cold round jet is computed and the results are compared to reference data. Results for the helicopter engine jet are presented for the time-averaged velocity field and turbulence intensities.