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首页> 外文期刊>Ocean Engineering >An experimental investigation into the constant velocity water entry of wedge-shaped sections
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An experimental investigation into the constant velocity water entry of wedge-shaped sections

机译：楔形截面恒速入水的实验研究

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Constant velocity water entry is important in understanding planing and slamming of marine vessels. A test rig has been developed that drives a wedge section with end plates down guides to enter the water vertically at near constant velocity. Entry force and velocity are measured. Analysis of the test data shows that the wetting factor is about 1.6 at low deadrise angles and reduces nearly linearly to 1.3 at 45° deadrise angle. The added mass increases quadratically with immersed depth until the chines become wetted. It then continues to increase at a reducing rate, reaching a maximum value between 20% and 80% greater than at chine immersion. The flow momentum drag coefficient is estimated from the results to be 0.78 at 5° deadrise angle reducing to 0.41 at 45° deadrise angles. Constant velocity exit tests show that the momentum of the added mass is expended in driving the water above the surface level and that exit forces are low and equivalent to a drag coefficient of about 1.0-1.3. Considerable dynamic noise limits the accuracy of the results, particularly after chine immersion.
机译：等速进水对于理解船舶的计划和撞击非常重要。已经开发出一种测试设备，该设备可驱动带有端板的楔形部分向下引导，以接近恒定的速度垂直进入水中。测量进入力和速度。对测试数据的分析表明，在低死角时的润湿系数约为1.6，在45°死角时的润湿系数几乎呈线性下降至1.3。附加质量随浸入深度呈二次方增加，直到脊变湿为止。然后，它继续以降低的速率增加，达到最大值，比浸入卡恩时高20％至80％。根据计算结果，流动动量阻力系数在5°死角时为0.78，在45°死角时为0.41。等速出口试验表明，增加质量的动量消耗在将水驱动到地表水平面以上的时候，出口力很低，相当于约1.0-1.3的阻力系数。相当大的动态噪声限制了结果的准确性，特别是在浸入卡恩之后。

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