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Embed domain availability checker hover5/30/2023 ![]() ![]() However, the present study is focused only on the hover performance, and the forward flight performance will be investigated in the next study with the wind-tunnel tests. The duct shape of the second model was designed asymmetrically in the longitudinal direction with the expectation of better performance in forward flight than a symmetric ducted fan. This research team of KARI has also been researching the performance of ducted fans and recently designed the second ducted fan model for an unmanned VTOL aircraft currently being developed. examined the ducted fan with tip jets numerically. Sheng and Zhai conducted numerical investigations of the ducted fan with active flow control devices that perform suction and injection of flows near the duct inner surface of the duct, and Chen et al. Furthermore, there were studies on the effects of artificial flows on the ducted fan. and Bontempo and Manna studied the effects of the duct geometry on the performance. ![]() studied how to represent the ducted fan aerodynamics with nondimensional coefficients. In addition, studies have been conducted on the performance of ducted fans in various ways. After the 2010s, as VTOL vehicles of various concepts including small UAVs were introduced, various forms of ducted fans appeared naturally such as fan-in-wing, multiduct, and coaxial types. Research on the ducted fan has been actively implemented from the early 2000s until recently, and the studies were mainly focused on a single ducted fan for a small UAV (unmanned aerial vehicle) that requires VTOL (vertical take-off and landing) ability in the 2000s. IntroductionĪ ducted fan type is known to have advantages over the open rotor type in terms of thrust, noise, and safety. 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. 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. 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. 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. 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. ![]()
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