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Research Article

Effect of blowing ratio on adiabatic effectiveness for effusion cooling in gas turbine combustor liners

K R Yellu Kumar1, Adnan Qayoum1, Shahid Saleem1, Fasil Qayoom Mir2

1Mechanical Engineering Department, National Institute of Technology Srinagar, J&K, India          2Chemical Engineering Department, National Institute of Technology Srinagar, J&K, India



Effusion cooling; 

Adiabatic effectiveness; 

Blowing ratio; 

Injection angle; 

Combustor liners;     

Gas turbine

The current study involves a computational investigation on the cooling of the combustion chamber liners in a gas turbine engine. Effusion cooling is a high-efficiency, lightweight and low-cost cooling system widely used in combustion chamber liners nowadays. The effect of blowing ratio and effusion hole injection angle on adiabatic effectiveness is investigated. The simulations are carried using COMSOL Multiphysics 5.4 with the standard k- ε turbulence model. A 3D computational model consisting of mainstream duct, effusion plate and effusion holes has been incorporated for the analysis. The blowing ratios used in the study are 0.25, 0.5, 1, 1.25 and 1.5 at constant density ratio of 1.0 for different injection angles of 30° and 60°. The simulation results show a strong dependence of adiabatic effectiveness on the blowing ratios. For low blowing ratios the adiabatic effectiveness in effusion hole region is high on account of coolant being attached to the surface. On the contrary, for high blowing ratios the adiabatic effectiveness is low near the effusion holes region. In the downstream region of effusion holes the adiabatic effectiveness raises for high blowing ratios. In addition, it has been observed that injection angle of 30o provides better adiabatic effectiveness compared to injection angle of 60o. The velocity and temperature profiles are investigated to demonstrate the behavior of coolant flow on the effusion surface and the influence on adiabatic effectiveness. This study concludes that the proper selection of blowing ratio and injection angle improves combustion chamber’s efficiency and lifetime.

© 2022 MIM Research Group. All rights reserved.


8/12/2023 Special Issue: Embark on a journey of innovation with the journal of Research on Engineering Structures and Materials as we unveil a compelling opportunity for contributors in our upcoming special issue, "Design, Analysis, and Manufacturing of Composite Vehicle Structures." Led by distinguished Guest Editors Liubov Gavva and Oleg Mitrofanov from Moscow Aviation Institute. For more info see the link.

21/10/2023 Journal Submission System Upgrade Completed: We're delighted to announce that our Journal Submission and Tracking System has undergone a significant upgrade, aimed at enhancing your experience. We apologize for the delay, and any inconvenience it may have caused. Here are the key enhancements from a user perspective:

Improvements are designed to make your interaction with our journal smoother and more efficient. Please take the upgraded system for a spin and share your thoughts with us. If you encounter any issues or have questions, please don't hesitate to reach out to our support team.

27/12/2022 Reviewer AwardsThe winners of 2022 reviewer awards of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Reviewer Awards section. 

(More details of the news may be given in the News section)

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2022 Reviewer Awards:

Please, visit Reviewer Awards section for the winners of the 2022 RESM reviewer awards.

2022 Best Paper Award:

The paper authored by Nitin Kumar, Michele Barbato, Erika L. Rengifo-López and Fabio Matta entitled as “Capabilities and limitations of existing finite element simplified micro-modeling techniques for unreinforced masonry” is awarded the 

2022 Most Cited Paper Award:

The paper authored by Aykut Elmas, Güliz Akyüz, Ayhan Bergal, Müberra Andaç and Ömer Andaç entitled as “Mathematical modelling of drug release" is awarded the


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