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research-article

DOUBLE WALL COOLING OF A FULL COVERAGE EFFUSION PLATE WITH MAIN FLOW PRESSURE GRADIENT, INCLUDING INTERNAL IMPINGEMENT ARRAY COOLING

[+] Author and Article Information
Sneha Vanga

Graduate Student, Propulsion Research Center, Department of Mechanical and Aerospace Engineering, 5000 Technology Drive, Olin B. King Technology Hall S236, University of Alabama in Huntsville, Huntsville, Alabama 35899 USA
sv0025@uah.edu

David Ritchie

Graduate Student, Propulsion Research Center, Department of Mechanical and Aerospace Engineering, 5000 Technology Drive, Olin B. King Technology Hall S236, University of Alabama in Huntsville, Huntsville, Alabama 35899 USA
dgr0007@uah.edu

Austin Click

Undergraduate Student, Propulsion Research Center, Department of Mechanical and Aerospace Engineering, 5000 Technology Drive, Olin B. King Technology Hall S236, University of Alabama in Huntsville, Huntsville, Alabama 35899 USA
ajc0029@uah.edu

Zhong Ren

Graduate Student, Propulsion Research Center, Department of Mechanical and Aerospace Engineering, 5000 Technology Drive, Olin B. King Technology Hall S236, University of Alabama in Huntsville, Huntsville, Alabama 35899 USA
zr0003@uah.edu

Phillip Ligrani

Eminent Scholar in Propulsion, Professor, Propulsion Research Center, Department of Mechanical and Aerospace Engineering, 5000 Technology Drive, Olin B. King Technology Hall, University of Alabama in Huntsville, Huntsville, Alabama 35899 USA, Phone: 256-824-5173
pml0006@uah.edu

Federico Liberatore

Consulting Engineer, Combustion Engineering, Solar Turbines, Inc., 2200 Pacific Highway, Mail Zone E-4, San Diego, California 92186-5376, USA
Liberatore_Fred_X@solarturbines.com

Rajeshriben Patel

Consulting Engineer, Combustion Engineering, Solar Turbines, Inc., 2200 Pacific Highway, Mail Zone E-4, San Diego, California 92186-5376, USA
Patel_Rajeshriben@solarturbines.com

Ram Srinivasan

Group Manager-Technology Development, Combustion Engineering, Solar Turbines, Inc., 2200 Pacific Highway, Mail Zone E-4, San Diego, California 92186-5376, USA
srinivasan_ram@solarturbines.com

Yin-Hsiang Ho

Group Manager-Method and Analysis, Combustion Engineering, Solar Turbines, Inc., 2200 Pacific Highway, Mail Zone E-4, San Diego, California 92186-5376, USA
Ho_Shaun@solarturbines.com

1Corresponding author.

ASME doi:10.1115/1.4041750 History: Received August 14, 2018; Revised October 11, 2018

Abstract

The present study provides new effusion cooling data for both surfaces of full coverage effusion cooling plate. For the effusion cooled surface, presented are spatially-resolved distributions of surface adiabatic film cooling effectiveness, and surface heat transfer coefficients (measured using transient techniques and infrared thermography). For the impingement cooled surface, presented are spatially-resolved distributions of surface Nusselt numbers (measured using steady-state liquid crystal thermography). To produce this cool side augmentation, impingement jet arrays at different jet Reynolds numbers, from 2720 to 11100, are employed. Considered are initial effusion blowing ratios from 3.3 to 7.5, with subsonic, incompressible flow. The velocity of the freestream flow which is adjacent to the effusion cooled boundary layer is increasing with streamwise distance, due to a favorable streamwise pressure gradient. Such variations are provided by a main flow passage contraction ratio CR of 4. Of particular interest are effects of impingement jet Reynolds number, effusion blowing ratio, and streamwise development. Also included are comparisons of impingement jet array cooling results with: (i) results associated with cross flow supply cooling with CR=1 and CR=4, and (ii) results associated with impingement supply cooling with CR=1, when the mainstream pressure gradient is near zero. Overall, the present results show that, for the same main flow Reynolds number, approximate initial blowing ratio, and streamwise location, significantly increased thermal protection is generally provided when the effusion coolant is provided by an array of impingement cooling jets, compared to a cross flow coolant supply.

Solar Turbines Incorporated
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