船用螺旋桨盘前方诱导速度计算

提出了计算船用螺旋桨盘前方诱导速度场的计算模型及方法。假定桨前方诱导速度可由三部分组成，即ｕ＝ｕＬ＋ｕｂ－ｕＦ，ｕＬ为由 Ｌｅｒｂｓ诱导因子法所计算的诱导速度；ｕＦ为由场点至桨盘处自由涡系在场点处所产生的诱导速度；ｕｂ为桨盘处附着涡在场点处所产生的诱导速度。这三部分诱导速度计算均十分简单，从而避免了由桨盘处开始向后泄向无穷远处自由涡系在场点处所产生的诱导速度计算时所必须进行的一无限数值积分，计算方法中计入了桨叶有限叶数的影响。所作实例计算与试验结果比较，吻合良好。

Calculating method of induced velocity forward marine propeller dick

The new calculating method of the induced velocity forward the propeller dick is presented. This velocity consists of three parts: u=uL-uF+ub; uL is a velocity at field point by Lerbs induced factor;uF is a velocity induced by the free vortex line from field point to the propeller dick at the field point; ub is a velocity induced by the boundary vortex on the propeller dick at the field point. These calculations are very simple,so an infinite integral can be avoid- ed. Finite blade effect has been taken into account in these calculation. This method has been applied to the calculation of an example and the result agrees very well with experimental result.