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research-article

Experimental and Numerical Investigation of Effusion Cooling Effectiveness of Combustion Chamber Liner Plates

[+] Author and Article Information
Arjun C. K.

Department of Mechanical Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Amritapuri Campus, Kollam, Kerala, INDIA. 690525
arjun50.nair@gmail.com

Jayakumar J S

Department of Mechanical Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Amritapuri Campus, Kollam, Kerala, INDIA. 690525
jsjayan@gmail.com

Y. Giridhara Babu

Propulsion Division, CSIR-National Aerospace Laboratories, Bangalore, INDIA. 560017
giris@nal.res.in

Felix J.

Propulsion Division, CSIR-National Aerospace Laboratories, Bangalore, INDIA. 560017
felix@nal.res.in

1Corresponding author.

ASME doi:10.1115/1.4039684 History: Received April 20, 2017; Revised March 09, 2018

Abstract

The present study aims to evaluate the adiabatic and conjugate effusion cooling effectiveness of combustion chamber liner plate of gas turbines. Validation of adiabatic model was done by comparing the CFD result with experimental results obtained using the subsonic cascade tunnel facility available at Heat Transfer Lab of CSIR-NAL. Computational simulation for the conjugate model is validated against published results. Numerical simulation is carried out for a 1:3 scaled up flat plate test geometry for the adiabatic cooling effectiveness analysis and actual flat plate geometry is considered for the conjugate cooling effectiveness analysis. The test plate was having 11 rows of cooling holes and the holes were arranged in staggered manner with each row containing eight holes. For both adiabatic and conjugate cases, the same mainstream conditions are maintained with the inlet temperature of 329K, velocity of 20 m/s, density ratio 1.3. The coolant to mainstream blowing ratios were maintained at 0.4, 1.15 and 1.6. The coolant temperature was 253K with the flow rates were according to the blowing ratios. Cooling effectiveness was obtained by using CFD simulation with ANSYS Fluent package. From the comparison of adiabatic and conjugate results, it is found that conjugate model is giving superior cooling protection than the adiabatic model and effusion cooling effectiveness increases with increase in blowing ratio. Investigations on comparison of angle of injection holes show that, 30o model give maximum effusion cooling effectiveness as compared to 45 and 60o models.

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