Development of monorotor with blade dynamic-aerodynamic coupling method and case analysis
To reduce the contradictions of propeller design in vertical-takeoff-landing(VTOL)and cruis-ing of propeller VTOL aircraft,a new propulsion layout is proposed in this paper,a monorotor driven by propel-ler,and an aerodynamic-dynamic coupling model is established for the imbalance design and analysis of the monorotor.Firstly,a coupling analysis method composed of unsteady blade element momentum theory and blade dynamics was derived and established.Compared with the computational fluid dynamics method,the steady-state calculation error was less than 7.3%.Then,the three-axis force and torque characteristics of the steady-state monorotor were analyzed,and a monorotor mass distribution design method was proposed.The dynamic un-balance characteristics were used for balancing,which can eliminate the unbalanced forces and moments of each axis in the steady-state.So the monorotor works like a symmetrical rotor.Finally,this paper analyzed the unbal-ance characteristics of the monorotor under unsteady-state conditions,and proposed that the transition function may reduce the temporary unbalance effect,which can reduce the dynamic unbalance torque by 66.8%and the dynamic unbalance force by 72.2%.
Vertical take-off and landingMonorotorPropellerDynamic trimDistributed mass de-sign
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