Paper Title :Enhancement of Centerline Film Cooling Effectiveness by Incorporating Airfoil Deposition and Optimizing Ratios of Fluid Mechanical Variables: A CFD Approach
Author :Muhammad Awais, Sayedus Salehin, Md. Hamidur Rahman
Article Citation :Muhammad Awais ,Sayedus Salehin ,Md. Hamidur Rahman ,
(2020 ) " Enhancement of Centerline Film Cooling Effectiveness by Incorporating Airfoil Deposition and Optimizing Ratios of Fluid Mechanical Variables: A CFD Approach " ,
International Journal of Mechanical and Production Engineering (IJMPE) ,
pp. 76-81,
Volume-8,Issue-3
Abstract : Film cooling technique is incorporated to lower the surface temperature of gas turbine components such as vanes, blades and
combustor liners which are exposed to significantly higher environmental temperature resulting in greater thermal stresses and prominent
reduction in life-span of hot components. In this study, the implementation of novel airfoil deposition is adopted on 2D-flat plate surface to
further improve the film cooling effectiveness of conventional cooling techniques. Furthermore, 26 different cases are investigated to
demonstrate the substantial impact of different ratios of blowing, velocity and momentum flux on flow behavior of coolant jet /mainstream
and film cooling effectiveness. It was concluded that when airfoil deposition is employed the dramatic augmentation of average(η )and
local(ηL) centerline film cooling effectiveness is achieved e.g. with airfoil deposition at X/D=30, BR=3.01, DR=2.74, and Rem=61760,ηLwas
found 8.0% higher than the blade surface without deposition. Moreover, with the airfoil deposition at BR=3.0, DR=2.74, and Rem=61760, η
was found 3.8% higher than the blade surface without deposition. It was noticed that the increment in blowing ratio and coolant jet density
yield higher local and average centerline film cooling effectiveness. The optimal value of BR and DR found in this study was 3.0 and 2.74
respectively.
Keywords - Gas Turbine, Film Cooling Effectiveness, CFD, Deposition Etc .
Type : Research paper
Published : Volume-8,Issue-3
DOIONLINE NO - IJMPE-IRAJ-DOIONLINE-17062
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Published on 2020-05-23 |
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