An idea of using dimples as heat transfer enhancement device in a regenerative cooling passage is proposed to extend the cooling limits for liquid-propellant rocket and scramjet. Numerical studies have been conducted to investigate the flow and heat transfer characteristics of supercritical hydrocarbon fuel in a rectangular cooling channel with dimples applied to the bottom wall. The numerical model is validated through experimental data and accounts for real fuel properties at supercritical pressures. The study shows that the dimples can significantly enhance the convective heat transfer and reduce the heated wall temperature. The average heat transfer rate of the dimpled channel is 1.64 times higher than that of its smooth counterpart while the pressure drop in the dimpled channel is only 1.33 times higher than that of the smooth channel. Furthermore, the thermal stratification in a regenerative cooling channel is alleviated by using dimples. Although heat transfer deterioration of supercritical fluid flow in the trans-critical region cannot be eliminated in the dimpled channel, it can be postponed and greatly weakened. The strong variations of fuel properties are responsible for the local acceleration of fuel and variation of heat transfer performance along the cooling channel.
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December 2017
This article was originally published in
Journal of Heat Transfer
Research-Article
Flow and Heat Transfer Characteristics of Supercritical Hydrocarbon Fuel in Mini Channels With Dimples
Yu Feng,
Yu Feng
Shenzhen Graduate School,
Harbin Institute of Technology,
University Town of Shenzhen,
Shenzhen 518055, China
e-mail: fengyu85@hit.edu.cn
Harbin Institute of Technology,
University Town of Shenzhen,
Shenzhen 518055, China
e-mail: fengyu85@hit.edu.cn
Search for other works by this author on:
Jie Cao,
Jie Cao
School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: CaoJie_971@163.com
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: CaoJie_971@163.com
Search for other works by this author on:
Xin Li,
Xin Li
School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: dandelion_hit@163.com
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: dandelion_hit@163.com
Search for other works by this author on:
Silong Zhang,
Silong Zhang
School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: zslhrb@gmail.com
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: zslhrb@gmail.com
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Jiang Qin,
Jiang Qin
School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: qinjiang@hit.edu.cn
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: qinjiang@hit.edu.cn
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Yu Rao
Yu Rao
Gas Turbine Research Institute,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: yurao@sjtu.edu.cn
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: yurao@sjtu.edu.cn
Search for other works by this author on:
Yu Feng
Shenzhen Graduate School,
Harbin Institute of Technology,
University Town of Shenzhen,
Shenzhen 518055, China
e-mail: fengyu85@hit.edu.cn
Harbin Institute of Technology,
University Town of Shenzhen,
Shenzhen 518055, China
e-mail: fengyu85@hit.edu.cn
Jie Cao
School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: CaoJie_971@163.com
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: CaoJie_971@163.com
Xin Li
School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: dandelion_hit@163.com
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: dandelion_hit@163.com
Silong Zhang
School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: zslhrb@gmail.com
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: zslhrb@gmail.com
Jiang Qin
School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: qinjiang@hit.edu.cn
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: qinjiang@hit.edu.cn
Yu Rao
Gas Turbine Research Institute,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: yurao@sjtu.edu.cn
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: yurao@sjtu.edu.cn
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 20, 2016; final manuscript received June 1, 2017; published online August 9, 2017. Assoc. Editor: Debjyoti Banerjee.
J. Heat Transfer. Dec 2017, 139(12): 122401 (11 pages)
Published Online: August 9, 2017
Article history
Received:
November 20, 2016
Revised:
June 1, 2017
Citation
Feng, Y., Cao, J., Li, X., Zhang, S., Qin, J., and Rao, Y. (August 9, 2017). "Flow and Heat Transfer Characteristics of Supercritical Hydrocarbon Fuel in Mini Channels With Dimples." ASME. J. Heat Transfer. December 2017; 139(12): 122401. https://doi.org/10.1115/1.4037086
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