摘要
为了获得实效伴流分数和推力减额系数,一般情况下要进行船桨自航实验。在导管调距桨的自航实验中,由于需要测量导管的推力以及调节螺距比,会增加实验的复杂程度。近年来,数值水池的应用得到了广泛关注。但由于计算模型通常为整条船和桨,几何模型复杂且计算量大。针对船体较长且具有平行中体的船舶,本文探索了一种简化模型方法即考虑半个船模和桨,忽略船首对尾部半流的影响。与实验结果比较,满载和压载工况下计算得到的伴流分数误差均约在4%左右。本文的研究表明在缺少实验条件的情况下,简化模型的CFD方法可以作为研究伴流分数的有效手段。
Self-propulsion tests of a ship and a propeller are generally required in order to obtain effective wake fractions and thrust reduction coefficients. For ducted controllable-pitch propellers, the complexity of measurement is increased because of the need to measure thrust of the duct and to adjust the pitch ratio. Ap- plication of numerical towing tanks have been attracted attention in recent years. However due to the com- putational domain involving the whole hull and propeller, the geometrical model is complex and the amount of computation is huge. For a long ship with a parallel middle body, a simplified ship model involving only half of the ship and a propeller is explored in this paper. The effect of the ship bow on the wake is ignored. Compared with measurements, an error for computed effective wake fractions is about 4% for both full loading and ballast conditions. This result shows that the current simplified method can be used to predict effective wake coefficients when lacking of experimental facility.
出处
《传动技术》
2015年第4期27-31,36,共6页
Drive System Technique
基金
国家高技术研究发展计划(863计划)(2009AA045002)
关键词
导管调距桨
自航试验
简化模型
CFD伴流分数
Ducted controllable-pitch propeller
self-propulsion test
simplified model
CFD
wake fraction
