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

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

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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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