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- 저자 : Linsong Jiang (검색결과 1 건)
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Haotian Qi,Ping Wang,Linsong Jiang 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.2
A numerical method based on Reynolds Averaged Navier–Stokes (RANS) equations and moving overset mesh technique is developed to simulate the unsteady flow field of a rigid coaxial rotor. A high-efficient hybrid trim model is adopted to ensure the simulation accuracy of lift-offset (LOS). Cases in different advance ratios are trimmed for constant thrust coefficient and torque-balance. The effects of LOS, rotor spacing and RPM on the aerodynamic performance and interaction are analyzed. Results show that, in forward flight the lift–drag ratio can be improved by appropriate LOS. The rotor drag increases with LOS, as there is also a corresponding offset of drag. The optimum LOS varies with flight speed. At large advance ratio the interactions of the coaxial rotor are much weak, except the blade–meeting interaction. The interaction is typically illustrated by the impulsive loads of the upper blade at retreating side (270°), as the flow field is dominated by the advancing blade (90°) of the lower rotor. The interaction intensity is sensitive to LOS, rotor spacing and RPM, as it depends on the flow field gradient induced by the lower blade acting on the upper blade.
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