Study on Flow and Heat Transfer Characteristics in Lamilloy Structure with Different Configurations of Internal Minichannels

Tao Yang, Xiaoming Zhang (), Zhenyuan Chang, Liang Xu, Lei Xi, Jianmin Gao, Wei Kou and Xiaochun Jing
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Tao Yang: Shaanxi Special Equipment Inspection and Testing Institute, Xi’an 710049, China
Xiaoming Zhang: Shaanxi Special Equipment Inspection and Testing Institute, Xi’an 710049, China
Zhenyuan Chang: Shaanxi Special Equipment Inspection and Testing Institute, Xi’an 710049, China
Liang Xu: School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Lei Xi: School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Jianmin Gao: School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Wei Kou: Shaanxi Special Equipment Inspection and Testing Institute, Xi’an 710049, China
Xiaochun Jing: Shaanxi Special Equipment Inspection and Testing Institute, Xi’an 710049, China

Energies, 2023, vol. 16, issue 24, 1-18

Abstract: This paper proposes a novel lamilloy cooling structure equipped with internal minichannels used in a combustor flame cylinder. The overall flow and heat transfer characteristics of three different internal minichannel configurations (parallel-flow, counter-flow, and staggered arrangements. PF, CF, and SF for short) are analyzed and compared. From the analysis of the heat transfer characteristic, it is found that the CF structure possesses the best cooling effect and temperature uniformity. The average cooling effectiveness ( ? ave ) of the CF structure increased by 20.6% and 20.4%, and the average temperature gradient ( ( d T / d X ) a v e ) decreased by 76.9% and 32.8%, compared with the SF structure and PF structure, respectively. From the analysis of flow characteristics, the coolant ejected from the minichannel one region of the SF structure completely blocks the direct contact between the mainstream and the lamilloy, while transferring more from the mainstream to the minichannel two region. Different from the SF structure, film cooling at the two outlet of the CF structure transfers most of the mainstream to the lower position, which further improves the cooling effect of the two internal minichannels.

Keywords: lamilloy cooling; internal minichannel; flow field; heat transfer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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