首页|Numerical analysis of wind effects on aerodynamic characteristics of a ducted fan
Numerical analysis of wind effects on aerodynamic characteristics of a ducted fan
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Ducted fans have been extensively used in Unmanned Aerial Vehicles(UAVs)for a vari-ety of missions because of high efficiency,high safety and low noise.Wind,as a kind of typical meteorological condition,brings significant aerodynamic interference to the ducted fan,which seri-ously threatens flight stability and safety.In this work,the numerical simulation with the Unsteady Reynolds Averaged Navier-Stokes(URANS)method and the sliding mesh technique is performed to evaluate the steady wind effect.The results show that the wind will lead to serious unsteady effects in the flow field,and the thrust fluctuates at the blade passing frequency of 200 Hz.As the wind speed increases,the rotor thrust increases,the duct thrust decreases,and the total thrust changes little.Flow instability may occur when the wind speed exceeds 8 m/s.As the angle of low-speed wind increases,the rotor thrust changes little,the duct thrust increases,and the total thrust increases.In addition,we figure out that cases with the same crosswind ratio are similar in results,and increasing the rotating speed or fan radius is beneficial to performance improvement in wind.The findings are essential to the ducted fan design and UAV flight control design for stable and safe operations in wind conditions.
State Key Laboratory of Intelligent Green Vehicle and Mobility,School of Vehicle and Mobility,Tsinghua University,Beijing 100084,China
Key Laboratory of Conveyance and Equipment Ministry of Education,East China Jiaotong University,Nanchang 330013,China
Vehicle Research Center,School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China
Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China
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National Key Research and Development Program of ChinaAdvanced Aviation Power Innovation institutionAero Engine Academy of ChinaTsinghua University Initiative Scientific Research Program,China
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