NDLI: Unsteady Effects of Profiled Endwalls on a 1.5 Stage Axial Turbine

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Tang, Huimin Liu, Shuaiqiang Luo, Hualing Hou, Weitao
Copyright Year	2015
Abstract	Using a profiled endwall is an effective method to reduce secondary losses in axial turbines. This approach has been widely investigated in the past decade on many real engines. Much of the previous analysis, however, was conducted in a steady state, with mixing plane conditions where the effects of unsteady interaction between inter-blade rows could not be taken into account. Since a profiled endwall has notable influences on the secondary flow and trailing shed vorticity, it is unavoidable that the profiled endwall may also alter the unsteady flow field. Previously, we executed an optimization procedure [27] to design profiled endwalls for a one-and-half stage, high work axial turbine. Steady state results indicate an improvement in stage efficiency due to profiled endwalls on both the stator one and rotor one. In this work, the effects of profiled endwalls on the turbine unsteady flow features have been analyzed by conducting unsteady simulations. Numerical results indicate that profiled endwalls on the upstream stator not only reduce the secondary loss and trailing edge shed vorticity of the stator, but also reduce the secondary losses of the downstream rotor by affecting the development of the passage vortex. However, a profiled endwall on a rotor has nearly no influence on the upstream stator performance. Transient results indicate that with the profiled endwalls of S1, the periodic fluctuations of flow fields are reduced, due to a weaker stator/rotor unsteady interaction. With profiled endwall of R1, the fluctuations of a flow fields become stronger over time, which means a profiled endwall of R1 can introduce significant unsteady effects to the turbine. Unsteady effects of profiled endwalls will be experimentally confirmed before this design is applied to a real turbine.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856635
DOI	10.1115/GT2015-43871
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	Blades Rotors Unsteady flow Flow (dynamics) Steady state Engines Optimization Transients (dynamics) Design Simulation Vortices Vorticity Stators Fluctuations (physics) Engineering simulation Turbines
Content Type	Text
Resource Type	Article

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