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Experimental investigation of the wetted surfaces of stepped planing hulls

机译：阶梯式船体润湿表面的实验研究

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摘要

In the current study, experimental tests are conducted to evaluate the hydrodynamic characteristics and the bottom wetted surfaces of the planing hulls equipped by one transverse step. For this purpose, total resistance, dynamic trim angle, dynamic sinkage, reattachment lengths of the separated flow and forebody and aftbody wetted areas are quantitatively measured at different geometrical parameters of the step and hull velocities. Moreover, the bottom wetted surfaces are qualitatively investigated by analyzing the underwater photographs. Our experimental results are also compared by archival data with good accordance. Based on our experimental observations, dynamic trim angle and dynamic sinkage are enhanced by increasing in the height of the step and decreasing the longitudinal position of step from transom. However, lower total resistance is achieved for greater height of the step. In addition, total wetted area is enhanced by decreasing the step height and hull velocity. However, larger total wetted area is detected by an increase in the longitudinal distance of the step from transom. Finally, we formulated the wetted areas of one step planing hull according to the reattached flow patterns.
机译：在当前的研究中，进行了实验测试，以评估由一个横向台阶所装备的滑行船体的水动力特性和底部润湿表面。为此，在踏板和船体速度的不同几何参数下，定量测量了总阻力，动态纵倾角，动态沉没，分离流以及前体和后体湿润区域的重新连接长度。此外，通过分析水下照片定性地研究了底部润湿的表面。我们的实验结果也与档案数据比较吻合。根据我们的实验观察，通过增加脚踏板的高度并减小脚踏板从横梁的纵向位置可以增强动态修整角和动态下沉。然而，对于更大的台阶高度，实现了更低的总电阻。另外，通过减小台阶高度和船体速度来增加总润湿面积。但是，通过增加脚踏板距横梁的纵向距离，可以检测到较大的总湿润面积。最终，我们根据重新连接的流型来制定了一步滑行船体的润湿区域。

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