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由于水洞流速较低,受弗劳德数影响,水洞实验条件下空泡形态存在上漂现象,实验得到的运动体尾部流体动力特性也因此受到影响.为了消除弗劳德数对实验结果的影响,得到较为合理的尾部升力曲线,采用有攻角情况下滑行状态时的升力减去零攻角时对应的升力的办法来修正实验结果,采用数值模拟方法证明了此方法的可行性.提出了对应通气率和对应空泡状态两种方法来对应相减.对两种方法的优劣进行了比较.采用此方法修正后的尾部流体动力曲线基本消除弗劳德数影响,曲线较为合理.
Due to the low flow velocity of the tunnel, the influence of the Froude number is affected by the bubble shape in the water tunnel experiment, and the hydrodynamics of the tail of the moving body is also affected.To eliminate the influence of the Froude number on the experimental results , The more reasonable tail lift curve is obtained. The experimental results are corrected by the lift at the time of taxiing with the angle of attack minus the corresponding lift at zero angle of attack, and the feasibility of this method is proved by numerical simulation. The corresponding ventilation rates and the corresponding cavitation state are proposed to correspond to the subtraction.Through the comparison of the advantages and disadvantages of the two methods, the modified hydrodynamic curve of tail fluid basically eliminates the influence of Froude number and the curve is more reasonable .