NDLI: The Influence of Boundary Conditions on Tip Leakage Flow

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	John, D. Coull Nicholas, R. Atkins
Copyright Year	2013
Abstract	Most of the current understanding of tip leakage flows has been derived from detailed cascade experiments. However, the cascade model is inherently approximate since it is difficult to simulate the boundary conditions present in a real machine, particularly the secondary flows convecting from the upstream stator row and the relative motion of the casing and blade. This problem is further complicated when considering the high pressure turbine rotors of aero engines, where the high Mach numbers must also be matched in order to correctly model the aerodynamics and heat transfer. More realistic tests can be performed on high-speed turbines, but the experimental fidelity and resolution achievable in such set-ups is limited. In order to examine the differences between cascade models and real-engine behavior, the influence of boundary conditions on the tip leakage flow in an unshrouded high pressure turbine rotor is investigated using RANS calculations. This study examines the influence of the rotor inlet condition and relative casing motion. A baseline calculation with a simplified inlet condition and no relative endwall motion exhibits similar behavior to cascade studies. Only minor changes to the leakage flow are induced by introducing either a more realistic inlet condition or relative casing motion. However when both of these conditions are applied simultaneously the pattern of leakage flow is very different, with ingestion of flow over much of the early suction surface. The paper explores the physical processes driving this change and the impact on leakage losses and modeling requirements.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856079
DOI	10.1115/TBTS2013-2057
Conference Proceedings	ASME 2013 Turbine Blade Tip Symposium
Language	English
Publisher Date	2013-09-30
Publisher Place	Hamburg, Germany
Access Restriction	Subscribed
Subject Keyword	Leakage Suction Blades Cascades (fluid dynamics) Rotors Aerodynamics Aircraft engines Flow (dynamics) Machinery Modeling Engines High pressure (physics) Reynolds-averaged navier–stokes equations Stators Boundary-value problems Resolution (optics) Leakage flows Turbines Heat transfer Mach number
Content Type	Text
Resource Type	Article

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