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Research Papers: Gas Turbines: Heat Transfer

Effect of Film Cooling on Turbine Capacity

[+] Author and Article Information
T. Povey

Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, UK

J. Eng. Gas Turbines Power 132(1), 011901 (Sep 30, 2009) (10 pages) doi:10.1115/1.3026564 History: Received April 10, 2008; Revised July 21, 2008; Published September 30, 2009

This paper describes a method that allows the effect of film cooling on the capacity of a turbine to be computed. The model is based on fundamental cooling performance parameters and is applicable to situations in which a mainstream flow is displaced by a partially mixed film cooling layer. The purpose is to quantify the error that is incurred in the engine situation when common—but simplified—assumptions are made regarding the flow, and where necessary, to provide a means of correcting the capacity for the effect of the film cooling flow.

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Figures

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Figure 1

Schematic of the mixing process

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Figure 2

Variation of γ with T

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Figure 3

Variation of ṁc and ṁm with M2h

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Figure 4

Variation of the predicted value of Φ with M2h

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Figure 5

Hot gas mass flow rate ṁH and corrected total mass flow rate ṁT as a function of M2h

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Figure 6

Sensitivity of the flow correction parameter Φ to variation in η, εF, and εM

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Figure 7

Sensitivity of the flow correction parameter Φ to variation in ζp, M1h, and αF

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Figure 8

Maximum variation in Φ over full range of εF

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Figure 9

Variation of γ with T for the cold-rig situation

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Figure 10

Variation of ṁc and ṁm with M2h for the cold-rig situation

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Figure 11

Variation of the predicted value of Φ with M2h for the cold-rig situation

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Figure 12

Hot gas mass flow rate (flow without film cooling) ṁH and corrected total mass flow rate ṁT as a function of M2h for the cold-rig situation

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Figure 13

Variation of Φ with M2h for the cold-rig situation, the engine situation, and the combined correction

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