On numerical jet flow simulation of current and future high by-pass engines

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On numerical jet flow simulation of current and future high by-pass engines

Pflug, M. / Haberland, C.

Due to the increasing by-pass ratio of future engines and its impact on engine-airframe integration, Turbine Powered Simulators (TPS) play an increasingly important role in wind tunnel investigations for determination of wing-engine interference. Since, applying such simulators, the hot core jet of the real engine has to be neglected, a verification of their capability to simulate real engine jet flow becomes necessary. Therefore, a comparative numerical study of the jet flow of isolated high by-pass engines is carried out by application of an axisymmetric jet model. In order to demonstrate the particular differences of jet plume shapes, TPS- and real engine jet flow of a conventional high by-pass turbofan engine, a very-high by-pass fan engine and an ultra-high by-pass fan engine are determined. Different thrust-settings, core cowling shapes and freestream flow conditions are employed and the resulting flow fields are discussed. A comparison between TPS and real engine jet plumes reveals only minor deviations in the interesting flow domain. The study leads to the conclusion, that TPS results are sufficiently accurate to predict interference effects.