槽道侧推水动力计算方法研究

Research on CFD method of channel side push

随着运输船舶的大型化,船舶操纵性越来越受到重视,而槽道侧推器发出的推力既可为船舶转向提供侧向力又可在动力定位系统中保持船舶稳定,提高了船舶的操纵性和稳定性。加之无轴推进技术的发展,将无轴推进器应用于槽道侧推,使用CFD软件对无轴侧推进行数值模拟,得到了一套适用于槽道侧推水动力计算的CFD方法,并将计算结果与试验数据对比,验证了其方法的可靠性。对船身推力产生原因和各部分推力大小进行研究,船身推力主要是因为螺旋桨抽吸作用在槽道进出口附近形成压力差而产生和螺旋桨推力同方向的轴向力。通过系列半径槽道进出口圆弧水动力计算,得到了进口不分离最小圆弧半径。

With the increase in the size of transport ships, more and more attention has been paid to ship maneuverability, and the thrust from the channel thruster can provide lateral force for ship steering and keep the ship stable in the dynamic positioning system, which can improve the ship maneuverability and stability. In addition to the development of shaftless propulsion technology, the shaftless propeller is applied to the channel side thrust to improve the hydrodynamic performance of the channel propeller. In this paper, CFD software is used to numerically simulate shaftless lateral thrusting, and a set of CFD methods suitable for hydrodynamic calculation of channel lateral thrusting are obtained, and the calculation results are compared with experimental data to verify the reliability of the method. The reasons for the thrust of the hull and the magnitude of the thrust of each part are studied. The thrust of the hull is mainly caused by the pressure difference formed near the inlet and outlet of the channel due to the suction of the propeller, which produces an axial force in the same direction as the thrust of the propeller. By calculating the arc hydrodynamic force of the inlet and outlet of a series of radius channels, the minimum arc radius of the inlet without separation is obtained.