襟翼参数对襟翼舵水动力特性的影响

Influence of Flap Parameters on Hydrodynamic Characteristics of Flap Rudders

为提升襟翼舵的水动力性能和船舶的操纵性,采用数值模拟方法对襟翼旋转轴位置和襟翼偏转角对襟翼舵水动力性能的影响规律进行研究。结果表明:在襟翼舵失速之前,随着襟翼旋转轴位置后移,襟翼舵的升力系数基本上呈减小的趋势,阻力系数也不断减小;襟翼舵在距襟翼舵前缘Xr为0.6倍弦长c时展现出较好的舵效,这是由于襟翼旋转轴位置更靠前,此处的压力面载荷出现跃升,使得整个襟翼舵的压力载荷增大;襟翼舵在Xr=0.9c时失速角最大,最大失速角为16°;襟翼舵在12°~18°攻角范围内的升力系数维持在较大范围内,升阻比最好,展现出较好的水动力性能。当襟翼旋转轴位于0.9c处,襟翼偏转角为15°时,襟翼舵展现出较好的升阻力性能,其失速角增大至16°,最大升力系数增大至1.61,相比襟翼偏转角为20°时的最大升力系数增大13.4%。

To improve the hydrodynamic performance of flap rudders and the maneuverability of ships,numerical simulation methods are used to study the influence of the flap rotation axis position and the flap deflection angle on the hydrodynamic performance of flap rudders.The results show that before the rudder stalls,the lift coefficient of the flap rudder basically shows a downward trend as the flap rotation axis position moves backward,and the drag coefficient also continuously decreases.The flap rudder has a good steering effect at Xr=0.6c.This is because the flap rotation axis position is more forward,and the pressure of the pressure surface jumps,increasing the pressure load of the whole flap rudder.The flap rudder with Xr=0.9c has the maximum stall angle of 16°,and its lift coefficient remains in a high range within the angle of attack of 12°-18°.It has the best lift to drag ratio and good hydrodynamic performance.When the flap rotation axis position is 0.9c and the flap deflection angle is 15°,the flap rudder has good lift and drag performance.Its stall angle increases to 16°,and the maximum lift coefficient increases to 1.61,which is 13.4%higher than the maximum lift coefficient when the flap deflection angle is 20°.