| 摘要: |
| 基于分布式电驱动涵道风扇推进系统在气动性能、推进效率和鲁棒性方面具有极大应用潜力，系统中复杂的耦合效应缺乏深入研究和理解。本文应用试验与数值模拟相结合的方式研究了某分布式涵道风扇系统中推进器之间的耦合效应，分析了推进器之间耦合干涉作用的规律与机理，为推动分布式电驱动涵道风扇的飞行器工程应用提供理论基础。研究结果表明：相较于风扇的孤立型布局，分布式布局风扇进口存在速度畸变影响涵道风扇性能，导致推力降低4%；分布式布局中风扇之间的耦合效应等效于风扇两侧存在虚拟且无黏的壁面结构，该虚拟壁面结构会诱发风扇两侧的两对流向涡；机翼-风扇之间的耦合效应表现为机翼的有黏壁面结构，会诱发风扇唇口上方的流动分离以及近机翼侧的一对流向涡；在分布式布局中涵道风扇出现转速下降或失效时，仅会对邻近风扇的性能造成影响，由于边缘风扇失效只有一个邻近风扇摄取失效风扇上游的流量，而中间风扇失效有两个邻近风扇用于摄取流量，边缘风扇失效对流动的影响高于中间风扇。 |
| 关键词: 分布式布局 孤立型布局 涵道风扇 耦合效应 风扇失效 |
| DOI：10.13675/j.cnki.tjjs.2208036 |
| 分类号:V231.1 |
| 基金项目: |
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| Experimental and numerical study on coupling effect of ducted fan in distributed electric propulsion system |
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ZHOU Fang1, WANG Yangang1, WANG Siwei1, CHEN Yanjun1, QIU Yasong2
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1.School of Power and Energy,Northwestern Polytechnical University,Xi’an 710129,China;2.School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China
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| Abstract: |
| Distributed electric propulsion system based on ducted fans has great application potential in aerodynamic performance， propulsion efficiency and robustness， but the complex coupling effect in the system lacks in depth study and understanding. In this paper， the coupling effect between propulsors in a distributed ducted fans system is studied by combining experiment with numerical simulation， and the law and mechanism of coupling interference between propulsors are analyzed， which provides theoretical basis for promoting the application of aircrafts powered by distributed electric ducted fans in engineering. The results show that compared with the isolated layout of the fan， the inlet velocity distortion of the distributed layout affects the performance of the ducted fan， resulting in a thrust reduction of 4%. The coupling effect between the fans in the distributed layout is equivalent to the existence of a virtual and non-stick wall structure on both sides of the fan， which will induce two pairs of flow vortices on both sides of the fan. The coupling effect between the wing and the fan is that the viscous wall structure of the wing induces the flow separation above the fan lip and a pair of flow vortices near the wing side. In the distributed layout， when the speed of the ducted fan decreases or the fan fails， it will only affect the performance of the adjacent fan. Due to the failure of the edge fan， only one adjacent fan takes up the flow upstream of the failed fan， and two adjacent fans are used to take up the flow in the middle fan. The influence of the edge fan failure on the flow is higher than that of the middle fan. |
| Key words: Distributed layout Isolated layout Ducted fans Coupling effects Failure of fan |
