【摘要】 为了改善船舶螺旋桨在中高载荷下由于吸力面局部压力过低造成空化的现象,提出通过改变螺旋桨的侧斜方式和侧斜角度来改善螺旋桨吸力面的压力分布,从而改善桨叶的空化形态的方法.以DTMB P4119桨为原型改变其侧斜方式和侧斜角度,新构造了7个螺旋桨,并基于k-ω SST湍流模型和混合网格方法对新构桨进行敞水数值计算.结果表明:对偏侧斜桨,随着侧斜角度的增加,螺旋桨的推力系数增加,敞水效率略有降低.而对于平衡侧斜桨,在低进速下,随着侧斜角度的增加,螺旋桨的推力系数和敞水效率降低;中低进速下平衡侧斜桨和偏侧斜桨的敞水效率相当,中高进速下,平衡侧斜桨的敞水效率高于偏侧斜桨;桨叶吸力面的低压区随侧斜角度的增加而变得狭长,有利于削弱片空化.更多还原

【Abstract】 In order to improve the cavitation caused by low local pressure of suction surface at intermediate and high loads, a method is proposed to improve the pressure distribution on the suction surface of the propeller by changing the skew styles and skew angle of the propeller so as to improve the cavitation level of propeller. Taking DTMB P4119 propeller as a prototype, seven propellers were reconstructed by changing the skew styles and skew angle, and based on k-ω SST turbulence model and hybrid grid method, the open water numerical calculation was carried out. The results show that the biased skew propeller′s thrust coefficient increases with the increase of skew angle, and the open water efficiency slightly decreases. For the balanced skew propeller, under the condition of low advance coefficient, the thrust coefficient and open water efficiency of the propeller decrease with the increase of the skew angle; under the condition of low and medium advance coefficient, the open water efficiency of the balanced skew propeller is similar to that of the biased skew propeller, while the open water efficiency of balanced skew propeller is higher than that of the biased skew propeller. The low pressure area of the suction surface of the blade becomes narrower with the increase of the skew angle, which is beneficial to weakening the sheet cavitation.更多还原