In this study, ground tests and numerical analysis were performed to verify the hover performance of the second ducted fan model designed by this research team. Shape of the duct inner surface was asymmetric in longitudinal direction, and considering various aspects such as test site or costs for test operation, a 40% scaled-down model of the ducted fan was adopted for this study. Both the results of the tests and the analysis were found to be coherent, and it was verified that the ducted fan was verified to be well designed to achieve the targeted performance. Furthermore, the performance of this ducted fan was compared with that of the symmetric one to determine the effects of the difference in the duct shape on the performance. It was observed that the symmetric ducted fan performs better in hovering flight, although the asymmetric ducted fan was sufficiently satisfied with the design intention.

中文翻译：

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垂直起降无人飞行器涵道风扇悬停性能研究

本研究通过地面试验和数值分析来验证本课题组设计的第二个涵道风扇模型的悬停性能。管道内表面的形状在纵向上是不对称的，考虑到试验场地或试运行成本等多方面因素，本研究采用了40%缩小的涵道风机模型。测试结果和分析结果一致，并验证了涵道风扇经过验证设计良好，可实现目标性能。此外，将这种管道风扇的性能与对称风扇的性能进行比较，以确定管道形状差异对性能的影响。据观察，对称涵道风扇在悬停飞行中表现更好，