Experimental Study on Flow and Heat Transfer Characteristics of Ambient Air in NACA0021 and NACA4822 Airfoil-Fin Channels

LI Yong; ZHANG Yingchun; FU Yu; ZHOU Qirun; ZHAO Yufei; YANG Senjie; MA Suxia

doi:10.21656/1000-0887.440331

Volume 45 Issue 5

May 2024

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Article Navigation > Applied Mathematics and Mechanics > 2024 > 45(5): 594-605

Zheng Xiyin, Wen Zhonglin. Minimax Theorem and Saddle Point Theorem without Linear Structure[J]. Applied Mathematics and Mechanics, 1998, 19(4): 349-354.

Citation:

LI Yong, ZHANG Yingchun, FU Yu, ZHOU Qirun, ZHAO Yufei, YANG Senjie, MA Suxia. Experimental Study on Flow and Heat Transfer Characteristics of Ambient Air in NACA0021 and NACA4822 Airfoil-Fin Channels[J]. Applied Mathematics and Mechanics, 2024, 45(5): 594-605. doi: 10.21656/1000-0887.440331

Zheng Xiyin, Wen Zhonglin. Minimax Theorem and Saddle Point Theorem without Linear Structure[J]. Applied Mathematics and Mechanics, 1998, 19(4): 349-354.

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Experimental Study on Flow and Heat Transfer Characteristics of Ambient Air in NACA0021 and NACA4822 Airfoil-Fin Channels

doi: 10.21656/1000-0887.440331

1.
College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R.China
2.
Key Laboratory of Cleaner Intelligent Control on Coal & Electricity, Ministry of Education, Taiyuan 030024, P.R.China
3.
School of Energy and Power Engineering, North University of China, Taiyuan 030051, P.R.China

Received Date: 2023-11-06
Rev Recd Date: 2024-04-23
Publish Date: 2024-05-01

Abstract

Abstract

The active regenerative cooling technology faces the bottleneck problem of insufficient heat transfer capacity when the scramjet flies at a higher Mach number. It is proposed to strengthen the heat transfer performance of the regenerative cooling channel with airfoil-fins. To verify the enhanced heat transfer effect of the airfoil-fin channel in principle, an experimental test platform for flow and heat transfer of ambient air in NACA0021 symmetrical airfoil-fin channels and NACA4822 asymmetric airfoil-fin channels (with cross-section sizes of 50 mm × 50 mm) was built. The Nusselt number of the heated surface was obtained based on the steady-state liquid crystal technique. The results show that, the heat transfer intensities of NACA0021 symmetrical airfoil-fin channels and NACA4822 asymmetric airfoil-fin channels improve by 0.17%~17.1% and 18.4%~52.1%, respectively. Correspondingly, PECs are 1.04 and 1.24, respectively, with the volume flow of ambient air at 50 m³/h. The NACA4822 asymmetric airfoil-fin channel can enhance the heat transfer performance of the middle heating surface under the condition of a large flow rate. The flow pressure drop in the airfoil-fin channels also increases correspondingly, where the pressure drop in the NACA4822 airfoil-fin channel is the largest. The asymmetry of the airfoil-fin causes the continuous accumulation of flow turbulence intensity, resulting in a significant increase in the downstream pressure drop. The work is helpful for further research on the flow and heat transfer characteristics of supercritical fluids in airfoil-fin channels, and broadens the application temperature range of the active regenerative cooling technology for scramjets.
- scramjet engine,
- airfoil-fin channel,
- Nusselt number,
- pressure loss

(Contributed by LI Yong, M. AMM Youth Editorial Board)

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References(20)

References

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