Title: Computational study of free-stream turbulence effects on film cooling using two different models

Authors: R. Rajappan, N.V. Mahalakshmi

Addresses: Anna University, Chennai, India. ' Department of Mechanical Engineering, Anna University, Chennai, India

Abstract: A computational and experimental investigation of three-dimensional mean flow field resulting due to the free stream turbulence on film cooling performance has been reported in this present paper. A row of square jet with L/D ratio of 2.5 as a reference case has been employed. The free stream turbulence intensity of 8% and the blowing ratio of 0.5 are investigated to check the impact of jet velocity on the cooling performance. The objective of the present work was to carry out a detailed investigation of the mean flow field and flow structure. Numerical simulations were performed using the commercial code FLUENT 6.2.16 based on the finite volume method with two different models, namely, k-ε, RSM models. The results of the preliminary computational analysis show that the flow field produced by the free stream provides a serious impact on the film cooling performance.

Keywords: square jets; cross flow; free-stream turbulence; RSM models; Reynolds stress models; k-ε model; film cooling; jet velocity; CFD; computational fluid dynamics; modelling.

DOI: 10.1504/PCFD.2011.038835

Progress in Computational Fluid Dynamics, An International Journal, 2011 Vol.11 No.2, pp.96 - 104

Published online: 04 Mar 2011 *

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