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Numerical simulation for downwash flow field of small-size unmanned helicopter hedgehopping |
Shi Qiang |
Key Laboratory of Modern Agricultural Equipment and Technology of Ministry of Education, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to explore the downwash flow field characteristic of small-size unmanned helicopter hedgehopping, numerical simulations were conducted.The full-size physical model of the small-size helicopter was established by SolidWorks software. The outer flow field and meshing were established by Ansys Workbench software and ICEM software.Three-dimensional flow field of small-size unmanned helicopter hedgehopping was simulated by Fluent software.The results show that in the downwash flow field,the main movement form is vertical,accompanied by circumferential rotation and radial shrinkage.The maximum velocity appeared at the bottom of the location of 0.8R(R is the radius of the rotor)far from the axis of rotor rotation.With the vertical height declining,the maximum velocity and velocity gradient decrease.The acquired flow field can serve as a design referernce for a small-size unmanned helicopter.
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Received: 08 April 2015
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