Influence of leakage of air hole on flow and heat transfer in recuperator

ABSTRACT

In this article, three-dimensional periodic numerical model for fully developed flow in a cross wavy primary surface recuperator for a micro-gas turbine system is built. Influence of leakage of air hole on flow and heat transfer of high temperature gas core and compressed air core was analyzed. The results of analysis show that with leakage of air hole considered, flow velocity of compressed air from air hole flowing into gas core is far greater than that of high temperature gas. In addition, the flow is opposite to each other. As a result, the flow resistance in gas channel increases. With leakage of air hole considered, heat convection between gas core and air core weakens. When the diameter of air hole increases by 50 μm, maximum temperature in gas core increases by 1 K in a period. The performance of heat recovery for regenerator is degraded. Thermal ratio decreases with the improvement the diameter of air hole. When the diameter of air hole increases by 50 μm, thermal ratio decreases by about 0.3%. The flow in the gas and air channel is anti-symmetry along the center of channel. The flow of fluid is fluctuant. The flow velocity of gas is much larger than that of air. The research results can be used to guide checking the performance of a recuperator.

KEYWORDS:

• Micro-Turbine
• cross wavy primary surface recuperator
• air hole
• leakage
• periodic

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Acknowledgments

The authors acknowledge the financial support provided by the Fundamental Research Funds for the Central Universities (Grant No. 2018YZ02) and Yueqi Scholar Program for China University of Mining and Technology (Beijing).

Additional information

Funding

This work was supported by the The Fundamental Research Funds for the Central Universities [2018YZ02];China University of Mining and Technology (Beijing) [Yueqi Scholar Program].

Notes on contributors

Xiaohong Gui

Xiaohong Gui, Male, was born in August, 1976 at Anqing City, Anhui Province, China. He is a Vice Professor in College of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing). He received his Ph.D. in 2009 from the Beijing University of Aeronautics and Astronautics. His research is about phase-change, high-temperature heat pipe and distributed power generation. He has published more than thirty academic articles in national and international scientific & technological journals.

Xiange Song

Xiange Song, Female, was born in March, 1975 at Datong City, Shanxi Province, China. She is a senior engineer in Beijing International Studies University. She received her master's degree in 2006 from Beijing Jiaotong University. Her research contributions were in the field of evaporation and condensation heat transfer. Her current interests focus on building energy efficiency under theoretical and experimental aspects.

Lukang Cheng

Lukang Cheng, Male, was born in March, 1993 at Weifang City, Shangdong Province, China. He is a graduate student in China University of Mining and Technology (Beijing).  His research is about distributed power generation.

Wei Jia

Wei Jia, Female, was born in May, 1996 at Taiyuan City, Shanxi Province, China. She is a graduate student in China University of Mining and Technology (Beijing). Her research is about distributed power generation and gas combustion.

Baisheng Nie

Baisheng Nie, Male, was born in April, 1973 at Yuncheng City, Shanxi Province, China and is now Professor and supervisor of doctoral program at China University of Mining and Technology (Beijing). His research interests include gas disaster prevention of mines, gas and dust explosion and methane of low concentration utilization. He finished over 30 projects of Cooperation Program with enterprise. He published 6 books and over 180 peer-review journal articles and conference articles which 40 articles were recorded by SCI index and 130 articles were recorded by EI index.

Guang Xu

Guang Xu, is a Senior Lecturer at Western Australian School of Mines, Curtin Univerisity. He received his Doctor degree in 2013 from Virginia Polytechnic Institute and State University. His current interests focus on: Computational Fluid Dynamics (CFD) modeling and tracer gas application in mining. He Published 30+ papers in high quality journals.