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Ventral support interference in low-speed and high Reynolds number wind tunnel

ZHENG Xinjun;JIAO Renshan;SU Wenhua;MA Honglei;ZHANG Lianhe;Aviation Key Laboratory of Aerodynamics for Low Speed and High Reynolds Number,AVIC Aerodynamics Research Institute of Aeronautics;  
For the problem of the ventral support interference in the FL-9 low-speed and high-Reynolds number wind tunnel,series comparative tests were conducted regarding various supports with different configurations including circle shape and twenty-four sides polygon,cone shape and constant section shape,different diameter ratios of the fuselage and the strut.These experiments were employed to study the selection rule for the FL-9 wind tunnel internal balance mono-strut ventral support with respect to the two-dimensional cross section shape,the threedimensional spatial shape,and the strut diameter.A strut insensible to Reynolds number was obtained with low and stable support interference.The repeatable precision and accuracy of the FL-9 wind tunnel internal balance mono-strut ventral system were further verified by comparing the present tests with those conducted in other wind tunnels.
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