The drag reduction effectiveness of KCS ship bubbles in waves was calculated and analyzed
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.
NETL
NSTL
万方数据
