NDLI: Aerothermal Performance of Shroudless Turbine Blade Tips With Effects of Relative Casing Motion

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Aerothermal Performance of Shroudless Turbine Blade Tips With Effects of Relative Casing Motion

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Virdi, A. S. Zhang, Q. He, L. Li, H. D. Hunsley, R.
Copyright Year	2013
Abstract	Recent work has indicated qualitatively different heat transfer characteristics between a transonic blade tip and a subsonic one. High resolution experimental data can be acquired for blade tip heat transfer research using a high speed linear cascade. While recognising an important role played by the cascade tests in validating computational models at the same conditions, some questions arise in relation to the effects of relative casing motion: 1) Does the relative casing movement change the main flow physics influencing the blade tip aerothermal performance? 2) Can a cascade set up with stationary casing wall rank different designs? 3) How do the effects of the casing motion depend on tip design configurations? A combined experimental and CFD study on several high pressure blade tip configurations is conducted to address these issues. Firstly, extensive experimental tests with aerodynamic loss and heat transfer measurement in a high speed linear cascade have been carried out for a squealer tip configuration at engine representative aerodynamic conditions. A systematic validation of the CFD solver (Rolls-Royce HYDRA) is presented, which serves as a basis for the computational analyses of the effects of the relative casing motion. Two tip configurations (squealer and flat tip) at three tip gaps (0.5%, 1.0%, 1.5% span) are analysed. The main aerodynamic impact of the casing motion is seen to promote the passage vortex, which consequently supresses the pitchwise reach of the tip leakage vortex. Inside the tip gap, the behaviour is dominated by the extra wall friction in relation of the inertia of the bulk fluid through the gap. As such, the moving casing effect is particularly strong for the flat tip at a small tip gap. For the large and medium tip gaps, both stationary and moving casing results are shown to consistently capture the trends in overall aerothermal performances. The present results confirm that even with relative casing motion, there is still a significant portion of transonic flow over a blade tip. For both the stationary and moving casing cases, the gap dependence of the over-tip heat transfer shows opposite trends for the transonic and subsonic regions respectively. The gap dependence of the blade tip heat transfer is shown to be clearly dependent on tip geometry configurations, as the bulk flow in a squealer cavity is subsonic regardless of the tip gap size, whilst the local flow state over a flat tip is much more responsive to the change of gap size.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856079
DOI	10.1115/TBTS2013-2021
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 Transonic flow Inertia (mechanics) Turbine blades Blades Computational fluid dynamics Cascades (fluid dynamics) Flow (dynamics) Engines Physics Design Geometry Cavities High pressure (physics) Fluids Friction Vortices Resolution (optics) Heat transfer
Content Type	Text
Resource Type	Article

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