Combined effect of upstream ramp and effusion cooling in combustion chamber liners of gas turbin

IF 1.1 Q3 Engineering

Journal of Thermal Engineering Pub Date : 2023-04-17 DOI:10.18186/thermal.1284759

Yellu KUMAR, Adnan QAYOUM, Shahid SALEEM, Fasil QAYOUM MIR

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Abstract

Effusion cooling technique is a highly efficient cooling method used to reduce the thermal stresses of combustion chamber liners in a gas turbine engine. The present study focuses on enhancing the adiabatic effectiveness of effusion cooling. The computational investigations are carried out using COMSOL Multiphysics 5.4 with the standard k- ε turbulence model. Detailed computations for 20 rows of effusion holes on the flat plate are examined for blowing ratios 0.25, 0.5, 1.0, 3.2, and 5.0 for each set of injection angles 30o and 60o. To enhance the effusion cooling performance, an upstream ramp (ramp angles 14o, 24o, and 34o) is introduced before the upstream of effusion holes. The results show that the adiabatic effectiveness increases with an increase of blowing ratio and ramp angles. By placing an upstream ramp, the low blowing ratios can greatly increase the adiabatic effectiveness by 29%, 31%, and 35% for ramp angles of 14o, 24o, and 34o, respectively. For high blowing ratios, an increase in the angles of the ramp shows less impact on adiabatic effectiveness throughout the effusion surface. However, adiabatic effectiveness has increased by 26% compared to the baseline model. It is also observed that injection angle of 30o provides more effectiveness than 60o. This study concludes that placing an upstream ramp increases the effusion cooling performance in the combustion chamber liners of a gas turbine engine

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燃气轮机燃烧室内胆上游斜坡与射流冷却的联合效应

射流冷却技术是一种用于降低燃气涡轮发动机燃烧室衬垫热应力的高效冷却方法。本文主要研究如何提高射流冷却的绝热效能。采用COMSOL Multiphysics 5.4和标准k- ε湍流模型进行了计算研究。对平板上的20排积液孔进行了详细的计算，对每组喷射角为30o和60o时的吹气比分别为0.25、0.5、1.0、3.2和5.0。为了提高射流冷却性能，在射流孔上游引入上游斜坡(斜坡角分别为14o、24o和34o)。结果表明，随着吹气比和斜转角的增大，绝热效能增大。当坡道角为140度、240度和34度时，低吹风比可使绝热效率分别提高29%、31%和35%。对于高吹气比，坡道角度的增加对整个射流表面的绝热效率影响较小。然而，与基线模型相比，绝热效率提高了26%。研究还发现，300度的注入角比600度的注入角更有效。研究表明，在燃气涡轮发动机燃烧室衬垫中设置上游坡道可以提高射流冷却性能

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Thermal Engineering THERMODYNAMICS-

CiteScore

2.40

自引率

18.20%

发文量

审稿时长

4 weeks

期刊介绍： Journal of Thermal Enginering is aimed at giving a recognized platform to students, researchers, research scholars, teachers, authors and other professionals in the field of research in Thermal Engineering subjects, to publish their original and current research work to a wide, international audience. In order to achieve this goal, we will have applied for SCI-Expanded Index in 2021 after having an Impact Factor in 2020. The aim of the journal, published on behalf of Yildiz Technical University in Istanbul-Turkey, is to not only include actual, original and applied studies prepared on the sciences of heat transfer and thermodynamics, and contribute to the literature of engineering sciences on the national and international areas but also help the development of Mechanical Engineering. Engineers and academicians from disciplines of Power Plant Engineering, Energy Engineering, Building Services Engineering, HVAC Engineering, Solar Engineering, Wind Engineering, Nanoengineering, surface engineering, thin film technologies, and Computer Aided Engineering will be expected to benefit from this journal’s outputs.