NDLI: Effect of Tip Gap and Squealer Geometry on Measured Heat Transfer Over a HPT Rotor Blade Tip

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Nasir, Hasan Srinath, V. Ekkad David, M. Kontrovitz Ronald, S. Bunker Prakash, Chander
Copyright Year	2003
Abstract	The present study explores the effects of gap height and tip geometry on heat transfer distribution over the tip surface of a HPT first stage rotor blade. The pressure ratio (inlet total pressure to exit static pressure for the cascade) used was 1.2, and the experiments were run in a blow-down test rig with a four-blade linear cascade. A transient liquid crystal technique was used to obtain the tip heat transfer distributions. Pressure measurements were made on the blade surface and on the shroud for different tip geometries and tip gaps to characterize the leakage flow and understand the heat transfer distributions. Two different tip gap-to-blade span ratio of 1% and 2.6% are investigated for a plane tip and a deep squealer with depth-to-blade span ratio of 0.0416. For a shallow squealer with depth-to-blade span ratio of 0.0104, only 1% gap-to-span ratio is considered. The presence of the squealer alters the tip gap flow field significantly and produces lower overall heat transfer coefficients. The effects of different partial squealer arrangements are also investigated for the shallow squealer depth. These simulate partial burning off of the squealer in real turbine blades. Results show that in some cases, partial burning of squealers along the pressure surface may be beneficial in terms of overall reduction in heat transfer coefficients over the tip surface compared to the plain tip.
Sponsorship	Heat Transfer Division
Starting Page	11
Ending Page	21
Page Count	11
File Format	PDF
ISBN	0791837181
DOI	10.1115/IMECE2003-41294
Volume Number	Heat Transfer, Volume 2
Conference Proceedings	ASME 2003 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2003-11-15
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Turbine blades Blades Cascades (fluid dynamics) Rotors Combustion Pressure Flow (dynamics) Liquid crystals Transients (dynamics) Geometry Pressure measurement Leakage flows Heat transfer coefficients Heat transfer
Content Type	Text
Resource Type	Article

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