| Considering the encountered problems of flying robot at low Reynolds number condition and the excellent lifting performance of fan-wing aircraft, this paper seeks to perform a detailed numerical analysis and experimental study on fan wing, which is of innovative significance for improving lift to drag ratio and flying stability of air robot.Geometric model was founded and CFD method was used to investigate the unsteady flow and static pressure distribution of fan wing, in which process the eccentric vortex observed earlier by other researchers in cross flow fan has been validated, and lifting force provided by eccentric vortex has been calculated, holding nearly80percent of the total lift. In CFD method, k-ε model was used for turbulence modeling, and the pressure-velocity coupling was calculated by the SIMPLE algorithm. Furthermore, the influence of six geometric parameters of fan wing on lifting effect were analyzed, which are front inflow angle, trailing edge angle, length of fixed wing, leaf number, blade angle and blade length, respectively. Also, two of the six parameters, fixed wing length and front inflow angle, were analyzed in experimental method. The result was in good agreement with CFD predicted lift. Only by optimizing wing shape to improve lift and aerodynamic performance has been verified. This paper confirmed that aerodynamic performance of flying robot can be improved through applying fan-wing lifting mechanism on it, although by the constraints of low-speed and small size, which is of practical significance and reference value. |
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