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research-article

SIMULATIONS OF SLOT FILM-COOLING WITH FREESTREAM ACCELERATION AND TURBULENCE

[+] Author and Article Information
Yousef Kanani

Illinois Institute of Technology, Mechanical, Materials and Aerospace Engineering Dept., Chicago, IL, USA, 60616
ykanani@hawk.iit.edu

Dr. Sumanta Acharya

Illinois Institute of Technology, Mechanical, Materials and Aerospace Engineering Dept., Chicago, IL, USA, 60616
sacharya1@iit.edu

Forrest Ames

University of North Dakota, Mechanical Engineering Department Grand Forks, ND, USA 58202
forrest.ames@engr.und.edu

1Corresponding author.

ASME doi:10.1115/1.4038877 History: Received September 11, 2017; Revised December 04, 2017

Abstract

Slot film cooling in an accelerating boundary layer with high free-stream turbulence is studied numerically using Large Eddy Simulations (LES). Calculations are done for a symmetrical leading edge geometry with the slot fed by a plenum populated with pin fins. To generate the inflow turbulence, the Synthetic Eddy Method is used by which the turbulence intensity and length scales in each direction can be specified at the inflow. Different levels of turbulence are imposed at the inflow cross-plane. Calculations are done for a Reynolds number of 250,000 and freestream turbulence levels of 0.7%, 3.5%, 7.8% and 13.7% are reported. These conditions correspond to the experimental measurements of Busche and Ames (2014). Numerical results show good agreement with experiment data and show the observed decay of thermal effectiveness with turbulence intensity. The turbulence and non-uniformity exiting the slot play an important role in the cooling effectiveness distributions downstream of the slot. Generation of freestream structures is observed at the leading edge, and the amplification of the corresponding fluctuations downstream is one of the parameters influencing the slot cooling performance. Predictions show the higher growth rate of the thermal boundary layer with increasing turbulence which is a clear indication of the increase in turbulent thermal diffusivity and reduction of the effective turbulence Prandtl number. The self-similar temperature profiles deviate from those measured under low freestream turbulence condition.

Copyright (c) 2017 by ASME
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