NDLI: Unsteady Analysis of Inter-Rows Stator-Rotor Spacing Effects on a Transonic, Low-Aspect Ratio Turbine

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Tang, Etienne Leroy, Gilles Philit, Mickaël Demolis, Jacques
Copyright Year	2015
Abstract	The aerodynamic performances of an axial turbine are affected by the distance between the stator and the rotor. Previous studies have shown different trends, depending mainly on whether the turbine is subsonic or not. The present paper aims at improving the understanding of the effect of rows spacing on the flow through a transonic turbine. A one-stage, low aspect ratio, high pressure turbine case is investigated using CFD. Steady and unsteady phase-lagged RANS computations are performed on this configuration with different inter-blade rows distances. The results are successfully compared with experimental data from a cold air turbine rig. Entropy production balances are used to emphasize the main loss areas and the loss variations caused by changes in inter-blade rows distance. Two techniques are compared for computing these balances, and one of them appears to perform much better. The flow features causing these losses are then identified. Finally, an optimal inter-rows spacing is found. It is a compromise between the losses created by strong stator-rotor interactions at small inter-rows gaps and the losses generated at the endwalls in the inter-rows space at large distances.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856635
DOI	10.1115/GT2015-42227
Volume Number	Volume 2A: Turbomachinery
Conference Proceedings	ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2015-06-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	High pressure (physics) Blades Computational fluid dynamics Computation Reynolds-averaged navier–stokes equations Rotors Stators Entropy Flow (dynamics) Turbines
Content Type	Text
Resource Type	Article

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