DOI: https://doi.org/10.1115/gt2020-14558Jan 15, 2021Proceedings Paper

Steady State Modeling of Unsteady Wake Induced Transition Effects in a Multistage Low Pressure Turbine

Christoph BodeMatthias Franke

Abstract

As low pressure turbine blade rows can operate at fairly low Reynolds numbers, long laminar boundary layers and transitional separation bubbles are not unusual in conventional blade design. Upstream wakes interact with the boundary layer in multistage low pressure turbine applications in a way that can alter the engine performance. In order to provide quick turnaround times, industrial applications mainly involve steady state computations which do not accurately model the unsteady wake effects. In this study, a low-pressure turbine cascade with periodic unsteady inflow as well as a two-stage low pressure turbine are computed at various Reynolds numbers using unsteady and steady RANS methods in the flow solver TRACE by DLR and MTU Aero Engines AG. A quasi-unsteady wake model working together with the γ – ReΘt model by Langtry and Menter is applied to the steady state simulation in another step in order to improve the prediction accuracy of low cost simulations utilizing mixing plane interfaces. The steady state results with and without wake model are compared to the time-resolved reference solution and the computation time is evaluated in order to show that the additional model is able to improve steady state mixing plane simula...Continue Reading

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