Efficient Prediction of Crashback Performance of Controllable Pitch Propellers

The prediction of propeller performance in crashback con-ditions with numerical methods is challenging due to thehighly unsteady flow field, which is dominated by large-scale separation and recirculation regions. For a controllable pitch propeller (CPP), the computations should becarried out for a wide range of pitch angles. Reynolds Averaged Navier-Stokes (RANS) methods are not capable ofcapturing the most complex flow conditions. Hence, moreprecise methods like Detached Eddy Simulations (DES)should be applied. The high computational effort in conjunction with the application of these methods demands astrong limitation of the number of investigated operation points. In this paper, the computed open water characteristics curves of a CPP are compared with the experimental results. Thereby, the ranges of the open water diagram areidentified, where the RANS methods yield unsatisfying results. In these ranges, DES simulations are carried out tocapture the flow details on a propeller in crashback operation condition. DES results are shown to be in good agreement with the experimental data of the thrust and torque coefficient.

DDC Class

000: Allgemeines, Wissenschaft

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Efficient Prediction of Crashback Performance of Controllable Pitch Propellers