论文期刊

Evaluation of nanoscale rotors and motors at static condition




作者: Z Liu, Ll Dong, JM Moschetta, Jp Zhao, Gr Yan
发表/完成日期: 2013-09-02
期刊名称: International Journal of Micro Air Vehicles
期卷: 5(3)
相关文章:
论文简介
The static performance of nano-scale rotor and the mechanical efficiency of micro rotors
are important factors to evaluate rotary-wing NAVs. In this paper, two pairs of nano-scale
rotors, which were formed with the same airfoil section for each pair, were compared to
find the influence of chord distribution and twist distribution to rotor performance. A test
bench was designed with highly sensitive mechanism systems in order to be able to
measure the thrust and torque of nano-rotors accurately. The static performance of nano-
scale rotors was evaluated experimentally with the test bench at ultra-low Re. And
computations based on 3D unsteady incompressible Navier-Stokes solver with artificial
compressibility were carried out as well to obtain the detailed flow field of nano rotor. It
was found that the rotor figure of merit degraded a lot with size reduction. And the rotor
solidity determined by chord distribution has a positive effect on the rotor thrust
coefficient while pitch angle distribution influences the power coefficient. Flow field
analysis indicated that the state of leading edge vortex might be the inherent reason of
the difference of performance between rotors. The mechanical efficiency of several small
motors were also compared which showed that the performance of small rotors decline
with the reduction of size.