Analysis of Some Improved Blade Tip Concepts

[+] Author and Article Information
C. Prakash, C. P. Lee, D. G. Cherry, R. Doughty, A. R. Wadia

 General Electric Aviation, 30 Merchant Sreet, Princeton Hill P20, Cincinnati, OH 45246

J. Turbomach 128(4), 639-642 (Feb 01, 2005) (4 pages) doi:10.1115/1.2220050 History: Received October 01, 2004; Revised February 01, 2005

Over tip leakage in high-pressure turbines contributes to aerodynamic losses and migration of hot gasses towards the tip resulting in increased thermal distress. Consequently, turbine designers continue to search for improved blade tip concepts that offer the promise of reducing tip leakage. The present paper deals with the computational fluid dynamics analyses of some such tip configurations. The geometries, patented by GE, are variants of a conventional squealer tip and include (i) a pressure side tip shelf with vertical squealer tip wall and (ii) a pressure side tip shelf with an inclined squealer tip wall. It is found that the inclined shelf results in separation of flow leaking over the tip, resulting in reduced leakage and improved efficiency. The inclined shelf also shows a reduced efficiency derivative with clearance.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

A Conventional squealer tip

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Figure 4

(a) Flow over conventional tip. (b) Flow over straight shelf. (c) Flow over inclined shelf.

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Figure 5

(a) Flow over straight shelf. (b) Flow over the inclined shelf.

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Figure 6

Variation of leakage flow

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Figure 7

Variation of blade row efficiency

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Figure 8

(a) Total relative pressure. Conventional squealer tip. (b) Total relative pressure. Vertical shelf. (c) Total relative pressure. Inclined shelf.




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