Research on the take-off motion characteristics of amphibious aircraft in regular waves based on the computational fluid dynamics method
To address the problem of an amphibious aircraft being disturbed by waves during an accelerated take-off motion,based on the numerical simulation technology of the Star-CCM+ platform,we introduce SST k-ε turbulence model to solve the RANS equation.We use the VOF method to capture the free surface and apply the DFBI module and overset grid technology to simulate the six-degree-of-freedom motion of a seaplane,thereby establishing a set of research schemes on the characteristics of accelerated taxiing and the take-off movement of an amphibious aircraft in regular waves.Considering wavelength and wave height as variables,we discuss their influence on variables on the heave-and-pitch motion response of the seaplane and the vertical acceleration at the center of gravity of the fuselage during acceleration taxiing.The results show that as the wavelength increases,the heave motion of the aircraft first increases and then changes slowly.The vertical acceleration of the aircraft's center of gravity,pitch angular accel-eration,and pitch peaks are concentrated within the range of the sea state such that the wavelength is 2-3 times the fuselage length.With an increase in the wave height,the maximum value of the aircraft heave,pitch motion,and the vertical acceleration of the center of gravity will increase,and the motion change in the long waves is greater than that in the short waves.The aerodynamic lift of the wing obtained through numerical simulation is consistent with the calculated value.This solution can be used for the correlation calculation of the aerodynamic force of am-phibious aircraft.
国家科技期刊平台
NSTL
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