Abstract
The aerodynamic performances of a ducted propeller system applied in a manned vertical takeoff and landing aircraft considering the ground effect are investigated. Based on the ground test and CFD simulation combined with sliding mesh technique, the thrust and power characteristics of the ducted propeller under different heights between the duct and ground are compared and analyzed, and the influence mechanism of the ground effect on the aerodynamic performance of the ducted propeller is detailed analyzed based on the CFD simulation results. The test and simulation results show that, the ground near the ducted propeller leads to a high-pressure zone to block the jet flow through the outlet of the duct, while an upward rebounded flow with the vortex rings is also generated to affect the aerodynamic forces and powers of both the duct and propeller. As the influence of the high-pressure zone, the thrust of the propeller increases. However, the thrust of the duct decreases when the rebounded flow is inhaled again into the duct. With the increase of the heights between the ground and the ducted propeller, the ground effect is weakened, and the power of the system recovers more quickly than the thrust. In general, the ground effect seriously affect the aerodynamic efficiency of the ducted propeller in near ground hover state, which should be mainly considered in the process of aerodynamic and conceptual design.
Highlights
The aerodynamic performances of a ducted propeller system applied in a manned vertical takeoff and landing aircraft considering the ground effect are investigated
Based on the ground test and CFD simulation com⁃ bined with sliding mesh technique, the thrust and power characteristics of the ducted propeller under different heights between the duct and ground are compared and analyzed,and the influence mechanism of the ground effect on the aerodynamic performance of the ducted propeller is detailed analyzed based on the CFD simulation results
The test and simulation results show that, the ground near the ducted propeller leads to a high⁃pressure zone to block the jet flow through the outlet of the duct, while an upward rebounded flow with the vortex rings is gener⁃ ated to affect the aerodynamic forces and powers of both the duct and propeller
Summary
国际航空, 2018(9) : 38⁃42 LIU Zheng, WU Hao. Development Status and Prospect of Urban Air Transport[ J] . Aerodynamics of a Tilting Ducted Fan Configuration[ R] . Performance Study of a Ducted fan System[ C] ∥American Helicopter Society Aerodynamics, Acoustics, and Test and Evaluation Technical Specialists Meeting, San Francisco, 2002 Improving Ducted Fan UAV Aerodynamics in Forward Flight[ R] .
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