【摘要】 针对凹凸结节仿生螺旋桨的设计需求，提出了一种参数化建模方法。定义了仿生位置因子及基于正弦函数的螺旋桨弦长修正参数，通过计算螺旋桨侧斜和纵倾的偏移量实现了在螺旋桨导边、随边或在两边有凹凸的仿生几何设计，保证了桨叶面的光顺性。基于DTMB 4119桨建模，得到导边凹凸结节的Bio 4119仿生桨，应用计算流体力学方法数值预报原型桨和仿生桨的敞水性能。研究结果表明，在低进速系数下，导边凹凸结节抑制了叶背面流动分离，改变了压力分布，抑制了导边附近片空化的产生，但在高进速系数下导边凹凸结节抑制片空化的能力不明显。更多还原

【Abstract】 To meet the design requirements of bionic propellers featuring convex–concave tubercles, this paper presents a parametric modeling method. By introducing a bionic position factor and a sinusoidal chord length correction parameter, and by calculating the offset of propeller skew and rake, the method enables the generation of bionic geometries with convex–concave tubercles on the leading edge, the trailing edge, or both edges, while maintaining geometric smoothness. Based on the DTMB 4119 propeller, a bionic variant(Bio 4119) with leading-edge convex–concave tubercles was constructed to validate the feasibility of the proposed parametric approach. Using computational fluid dynamics, the open-water performance and associated flow characteristics of both the baseline and bionic propellers were numerically investigated and compared. The results indicate that at lower advance coefficients, the leading-edge convex–concave tubercles suppress flow separation on the blade suction surface, alter the pressure distribution, and inhibit the formation of sheet cavitation near the leading edge. At higher advance coefficients, however, the tubercles exhibit no significant suppression effect on sheet cavitation.更多还原