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research-article

Enhancement of Film Cooling Effectiveness Using Rectangular Winglet Pair

[+] Author and Article Information
Prakhar Jindal

Birla Institute of Technology, Mesra, Ranchi, Department of Mechanical Engineering, Birla Institute of Technology, Mesra, Ranchi - 835215
prakharjindal@gmail.com

Shubham Agarwal

Birla Institute of Technology, Mesra, Ranchi, Department of Mechanical Engineering, Birla Institute of Technology, Mesra, Ranchi - 835215
1994shubham.agarwal@gmail.com

R. P. Sharma

Birla Institute of Technology, Mesra, Ranchi, Professor R.P. Sharma, Department of Mechanical Engineering, Birla Institute of Technology, Mesra, Ranchi - 835215
rpsharma@bitmesra.ac.in

A.K. Roy

Birla Institute of Technology, Mesra, Ranchi, Associate Professor, Department of Mechanical Engineering, Birla Institute of Technology, Mesra, Ranchi - 835215
akroy@bitmesra.ac.in

1Corresponding author.

ASME doi:10.1115/1.4039700 History: Received May 05, 2016; Revised February 16, 2018

Abstract

The current study deals with the film cooling enhancement in a combustion chamber by the use of rectangular winglet vortex generators. Rectangular winglet pair (RWP) in both the common-flow up and the common-flow down configuration is installed upstream of a coolant injection hole on the lower chamber wall. A three-dimensional numerical approach with complete solution of Navier-Stokes equations closed by the k-? turbulence model is used for analyzing the effect of vortex generator (VG) installation on film cooling effectiveness enhancement. The effect of rectangular winglet pair orientation is investigated to deduce the best configuration which is then optimized in terms of its geometrical parameters including its upstream distance from the hole and the angle it makes with the incoming flow. Results obtained show that a rectangular winglet pair located upstream of the coolant hole in common-flow down configuration gives the best effectiveness enhancement with certain other geometrical parameters specified. A novel "mushroom" adiabatic distribution scheme for film cooling effectiveness and temperature has been discussed in the paper. This characteristic scheme is developed as a result of RWPs' vortices interaction with the coolant inlet jet and the hot mainstream flow. A detailed discussion of the mechanisms and the flow field properties underlying the effectiveness enhancement and other phenomenon observed has also been presented in the paper.

Copyright (c) 2018 by ASME
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