An advanced impingement/film cooling scheme for gas turbines – numerical study
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 1 June 2006
Abstract
Purpose
The present study aims to conduct a numerical investigation of a novel film cooling scheme combining in‐hole impingement cooling and flow turbulators with traditional downstream film cooling, and was originally proposed by Pratt & Whitney Canada for high temperature gas turbine applications.
Design/methodology/approach
Steady‐state simulations were performed and the flow was considered incompressible and turbulent. The CFD package FLUENT 6.1 was used to solve the Navier‐Stokes equations numerically, and the preprocessor, Gambit, was used to generate the required grid.
Findings
It was determined that the proposed scheme geometry can prevent coolant lift‐off much better than standard round holes, since the cooling jet remains attached to the surface at much higher blowing rates, indicating a superior performance for the proposed scheme.
Research limitations/implications
The present study was concerned only with the downstream effectiveness aspect of performance. The performance related to the heat transfer coefficient is a prospective topic for future studies.
Practical implications
Advanced and innovative cooling techniques are essential in order to improve the efficiency and power output of gas turbines. This scheme combines in‐hole impingement cooling and flow turbulators with traditional downstream film cooling for improved cooling capabilities.
Originality/value
This new advanced cooling scheme both combines the advantages of traditional film cooling with those of impingement cooling, and provides greater airfoil protection than traditional film cooling. This study is of value for those interested in gas turbine cooling.
Keywords
Citation
Immarigeon, A. and Hassan, I. (2006), "An advanced impingement/film cooling scheme for gas turbines – numerical study", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 16 No. 4, pp. 470-493. https://doi.org/10.1108/09615530610653091
Publisher
:Emerald Group Publishing Limited
Copyright © 2006, Emerald Group Publishing Limited