Notice of Retraction: An experimental and theoretical evaluation of micro rotor MCF3225 in static conditions

Abstract

The hovering performance of micro rotor with twisted blades and nonuniform chords was studied experimentally and theoretically in a low Reynolds range from 2,000 to 1,6000. With the reduction of rotor diameter and motor size, the hovering performance study becomes a challenge for micro rotors. This study focus on the hovering performance of a carbon laminate rotor of MCF3225 with diameter of 8.1cm. A test bench was designed with sensitive mechanism system in view of being able to measure the thrust and torque of micro rotor simultaneously and response to the change of variables rapidly with sufficient accuracy. Experiments were conducted at several different rotational speeds. Corresponding to the experiments, computations were also performed by incompressible Reynolds-averaged Naiver-Stokes solver with laminar flow model and moving reference frame technique. The thrust coefficient and power coefficient was analyzed. The figure of merit of rotor was also calculated. It was found that the thrust coefficient kept almost a constant while the power coefficient changed with the variation of Reynolds number. Both the experiments and computations show that the figure of merit was less than 0.45. And it is evident that the performance of rotor and motor degraded with the reduction of rotor diameter and motor size.