波浪中KCS船气泡减阻效能计算分析

The drag reduction effectiveness of KCS ship bubbles in waves was calculated and analyzed

随着世界范围内对节能减排问题越来越重视,如何高效减少船舶阻力成为我国航运业重点关注的问题之一,为解决船舶在波浪中航行时能耗大,摩擦阻力大的问题,针对波浪中的船舶气泡减阻效能进行分析。以韩国船舶与海洋工程研究所研制的KCS集装箱船船模为研究对象,基于欧拉多相流,对船底通入微气泡,考虑气体和液体之间的相互作用力,保持船舶航速和通气孔的直径不变的情况下,通过研究不同通气量下波高波长变化对气体体积分数和船舶总阻力变化影响。结果表明,浪高越高,船舶运动越剧烈,阻力越大;在一定通气量下,波长船长比变化亦会对船舶阻力产生影响。根据实验结果用曲线和云图的形式,论述了波浪增阻与气泡润滑减阻相互耦合作用的机理并且从能量守恒的角度分析了通气量的变化对减阻效果的影响。

With the increasing emphasis on energy conservation and emission reduction worldwide,how to efficiently reduce ship resistance has become one of the key concerns of China's shipping industry.To solve the problem of high energy consumption and friction resistance when ships navigate in waves,the drag reduction efficiency of ship bubbles in waves is analyzed.The KCS container ship model developed by the Korea Institute of Ship and Ocean Engineering is taken as the re-search object.Based on Euler multiphase flow,micro bubbles are introduced into the bottom of the ship,the interaction between gas and liquid is considered,and the ship speed and the diameter of the vent hole are kept constant.The effects of wave height and wave length changes on the gas volume fraction and the total resistance of the ship under different ventila-tion volumes are studied.The results show that the higher the wave height,the more intense the ship's motion and the greater the resistance;The change in wavelength to length ratio under a certain ventilation capacity can also have an impact on ship resistance.Based on the experimental results,the mechanism of the coupling effect between wave drag enhancement and bubble lubrication drag reduction was discussed in the form of curves and cloud charts,and the impact of changes in ventila-tion on the drag reduction effect was analyzed from the perspective of energy conservation.