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Volume 14
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10.3390/en14040840
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Article

A Matching Problem between the Front Fan and Aft Fan Stages in Adaptive Cycle Engines with Convertible Fan Systems

by
Xin Meng
,
Zhili Zhu
,
Min Chen
* and
Yihao Xu
School of Energy and Power Engineering, Beihang University, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Energies 2021, 14(4), 840; https://doi.org/10.3390/en14040840
Submission received: 12 January 2021 / Revised: 29 January 2021 / Accepted: 2 February 2021 / Published: 5 February 2021
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Abstract

In the process of studying the steady-state performance and component matching of adaptive cycle engines with convertible fan system, it was found that the front fan and aft fan stage have a unique matching problem when the mode select valve is closed and engine is operating at higher Mach number conditions. The cause of this matching problem was studied with numeric simulation in this paper. Based on the features of adaptive cycle engines with convertible fan system, the possible methods and their feasibilities of solving this matching problem were also discussed. According to the results, the flow rate adjustment capacity of the aft fan stage directly determines the occurrence and severity of this matching problem. The matching problem can be ameliorated in some extent by either reducing the design second bypass ratio or adjusting the variable geometry mechanisms, but it cannot be completely solved at the aspect of component matching mechanism.
Keywords: adaptive cycle engine with convertible fan system; matching mechanism; front fan; aft fan stage adaptive cycle engine with convertible fan system; matching mechanism; front fan; aft fan stage

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MDPI and ACS Style

Meng, X.; Zhu, Z.; Chen, M.; Xu, Y. A Matching Problem between the Front Fan and Aft Fan Stages in Adaptive Cycle Engines with Convertible Fan Systems. Energies 2021, 14, 840. https://doi.org/10.3390/en14040840

AMA Style

Meng X, Zhu Z, Chen M, Xu Y. A Matching Problem between the Front Fan and Aft Fan Stages in Adaptive Cycle Engines with Convertible Fan Systems. Energies. 2021; 14(4):840. https://doi.org/10.3390/en14040840

Chicago/Turabian Style

Meng, Xin, Zhili Zhu, Min Chen, and Yihao Xu. 2021. "A Matching Problem between the Front Fan and Aft Fan Stages in Adaptive Cycle Engines with Convertible Fan Systems" Energies 14, no. 4: 840. https://doi.org/10.3390/en14040840

APA Style

Meng, X., Zhu, Z., Chen, M., & Xu, Y. (2021). A Matching Problem between the Front Fan and Aft Fan Stages in Adaptive Cycle Engines with Convertible Fan Systems. Energies, 14(4), 840. https://doi.org/10.3390/en14040840

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