Sail assistance is an important application of renewable energy in ship propulsion.Pressure distribution,lift and drag for the airfoils with camber ratios from 0.02 to 0.2 are investigated by using standard k-ε turbulent flow equations and the CFD software.Coefficients of maximum thrust and lateral force are resolved for different angles between the relative wind direction and the direction of ship velocity.The optimal attack angle of the improved airfoil with camber ratio of 0.1 is 27°,and the optimal angle between the relative wind direction and the direction of ship velocity is 110°.In this case,the maximum thrust coefficient induced by the airfoil reaches to 1.721.%风帆助航是新能源应用于船舶航运的重要途径.论文以改进帆翼为研究对象,采用标准k-ε湍流模型描述改进帆翼流体动力学特性,对拱度比为0.02～0.2的改进帆翼附近的流场压力分布、产生的升力和阻力进行数值分析.求解不同相对风向角时各改进帆翼对船舶产生的最大助推力系数和横向力系数.综合考虑各种拱度比下改进帆翼的升力、最大升阻比随风力几何攻角的变化规律、最大助推力系数随相对风向角的变化规律,拱度比为0.1的改进帆翼为最优翼型.通过进一步的数值模拟得知,拱度比为0.1的改进帆翼最佳几何攻角为27°,最适宜的相对风向角为110°,此时改进帆翼对船舶产生的助推力系数达到最大,为1.721.
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