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research-article

NON-UNIFORM JET ARRAY IMPINGEMENT ON A CURVED SURFACE

[+] Author and Article Information
Jahed Hossain

University of Central Florida; Laboratory for Turbine Aerodynamics, Heat Transfer and Durability; Center for Advanced Turbomachinery and Energy Research 12781 Ara Drive, Orlando, FL 32826
jahed.hossain@knights.ucf.edu

John Harrington

University of Central Florida; Laboratory for Turbine Aerodynamics, Heat Transfer and Durability; Center for Advanced Turbomachinery and Energy Research 12781 Ara Drive, Orlando, FL 32826
john.harrington@knights.ucf.edu

Wenping Wang

University of Central Florida; Laboratory for Turbine Aerodynamics, Heat Transfer and Durability; Center for Advanced Turbomachinery and Energy Research 12781 Ara Drive, Orlando, FL 32826
wenping.wang@ucf.edu

Jayanta Kapat

University of Central Florida; Laboratory for Turbine Aerodynamics, Heat Transfer and Durability; Center for Advanced Turbomachinery and Energy Research 12781 Ara Drive, Orlando, FL 32826
Jayanta.Kapat@ucf.edu

Steven Thorpe

Ansaldo Energia Switzerland Romerstrasse 36 Baden, Switzerland 5401
Steven.Thorpe@ansaldoenergia.com

Michael Maurer

Ansaldo Energia Switzerland Romerstrasse 36 Baden, Switzerland 5401
MichaelThomas.Maurer@ansaldoenergia.com

1Corresponding author.

ASME doi:10.1115/1.4038023 History: Received May 20, 2017; Revised June 14, 2017

Abstract

Experiments to investigate the effect of varying jet hole diameter and jet spacing on heat transfer and pressure loss from jet array impingement on a curved target surface are reported. The jet plate configurations studied have varying hole diameters and geometric spacing for spatial tuning of the heat transfer behaviour. The configuration also includes a straight section downstream of the curved section, where the effect on heat transfer and pressure loss is also investigated. A steady-state measurement technique utilizing temperature sensitive paint (TSP) was used on the target surface to obtain local heat transfer coefficients. Pressure taps placed on the sidewall and jet plate of the channel were used to evaluate the flow distribution in the impingement channel. First row jet Reynolds numbers ranging from 50,000 to 160,000 are reported. Further tests were performed to evaluate several modifications to the impingement array. These involve blocking several downstream rows of jets, measuring the subsequent shifts in the pressure and heat transfer data, and then applying different turbulator designs in an attempt to recover the loss in the heat transfer while retaining favorable pressure loss. It was found that by using W shaped turbulators, the downstream surface average Nusselt number increases up to ~13% as compared with a smooth case using the same amount of coolant .The results suggest that by properly combining impingement and turbulators (in the post impingement section), higher heat transfer, lower flow rate, and lower pressure drop are simultaneously obtained, thus providing an optimal scenario.

Copyright (c) 2017 by ASME
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