由推进器尾流计算确定动力艇合理牵引间距研究

针对动力艇尾流作用于被牵引船只,造成水阻力增加而使牵引效率下降的问题,提出通过数值模拟方法计算动力艇尾流场,进而确定合理的牵引间距的方法.文章应用理想推进器理论,给出了确定推进器尾流出口横截面面积和喷水流速的方法.在此基础上,通过数值模拟计算推进器尾流场的影响,并通过分析估计出给定牵引航速下的合理牵引间距.该方法可以结合动力艇的拖钩拉力与航速曲线,确定组合体可能达到的最大设计航速.

An investigation on determination of proper towing distance between the autoboat and the dumb ship by numerical simulation on the wake flow of the propeller

In the case of the problem that the wake flow of the autoboat makes the water drag of the ship in tow increase so that the efficiency of towing goes down, this paper presents a method for determining the optimal towing distance by numerical simulation on the wake flow of the autoboat. Firstly, in order to make certain the area of the outlet cross-section of the propeller as well as the jet velocity, the theory of ideal propeller is applied. Then, numerical simulations on the wake flow of the propeller are carried out to estimate the optimal towing distance at given towing speeds. Associated with the relationship between the towing force of a given autoboat and its sailing velocity, this method can be used to figure out the designed maximum sailing velocity of the assembled body (autoboat towing ships).