基于CFD法的对转螺旋桨水动力性能研究

发布时间：2018-07-08 13:06

本文选题：对转螺旋桨 + 敞水性能　；参考：《大连理工大学》2015年硕士论文

【摘要】：近年来,人们对于船舶的快速性提出了更高的要求,特别是军事方面,舰船快速性一直是专家研究的重大课题,在民用方面,由于生活节奏的加快和能源的匮乏,人们对于船舶的快速性和节能性给予了更高的期望,螺旋桨作为船舶推进的核心所在,不管是在军用还是民用方面都得到了很高的重视。对转螺旋桨作为最为有效提高船舶快速性和推进效率的特种螺旋桨,正得到越来越多学者的重视,但是对于其实质性的研究相对较少,本文主要基于CFD数值模拟方法,研究对转螺旋桨水动力性能,具体内容为：1、对B系列螺旋桨B4-40进行了CFD数值计算。比较了B4-40在Standard k-ε、 RNG k-ε.RSM.SSTk-ω四种湍流模型下的敞水性能,考虑到计算精度和计算时效,认为SSTk-ω模型较佳。然后对B4-40螺旋桨压力特性和尾流场进行了分析研究。2、进一步完成了B系列对转螺旋桨的CFD数值计算,对比RSM和SSTk-ω湍流模型数值计算结果,SSTk-ω模型更佳。相比单桨,由于对转桨后桨处于前桨尾流里,后桨计算误差较大,建议采用动网格技术,减小数值计算误差。3、选择两组对转桨模型进行CFD数值计算,对比分析结果后,得到对转桨桨距比L/D和直径比Da/Df的最佳参数,同时对对转桨数值计算结果和尾流场进行对比分析,研究造成不同结果的原因。4、选择两个最好的对转桨模型分别与B4-76.8、B4-78螺旋桨的敞水性能进行比较,发现在相同J下,对转桨效率略低于单桨,但是推力远远大于后者；在相同功率系数时,对转桨的敞水效率明显好于单桨,效率提高最大超过7.46%,表明对转桨的高效性。
[Abstract]:In recent years, people have put forward higher requirements for the speed of ships, especially in the military, ship rapidity has been an important subject of expert research. In civilian, due to the accelerated pace of life and the lack of energy, As the core of ship propulsion, propeller has been attached great importance to both military and civil aspects. As the most effective special propeller to improve the ship speed and propulsion efficiency, more and more scholars are paying attention to the propeller, but the substantial research is relatively few, this paper is mainly based on CFD numerical simulation method. The hydrodynamic performance of rotating propeller is studied. The CFD numerical calculation of B series propeller B4-40 is carried out. The open water performance of B4-40 in four turbulence models, Standard k- 蔚, RNG k- 蔚. RSM.SSTk- 蠅, is compared. Considering the calculation accuracy and calculation time, the SSTk- 蠅 model is considered to be better. Then, the pressure characteristics and wake field of B4-40 propeller are analyzed and studied, and the CFD numerical calculation of B series propeller is further completed, which is better than that of RSM and SSTk- 蠅 turbulence model. Compared with the single propeller, because the rear propeller is in the wake of the front propeller, the calculation error of the rear propeller is larger. It is suggested that the dynamic grid technique be used to reduce the numerical calculation error of the rotor. Two groups of rotor models are selected to carry out the CFD numerical calculation, and the results are compared. The optimum parameters of the pitch ratio L / D and the diameter ratio of D / D are obtained, and the numerical results and the wake flow field are compared and analyzed. The reasons for the different results are studied. 4. The open water performance of the two best propeller models is compared with that of the B4-76.8U B4-78 propeller. It is found that the propeller efficiency is slightly lower than that of the single propeller under the same J, but the thrust is much higher than the latter. At the same power coefficient, the open water efficiency of the propeller is obviously better than that of the single propeller, and the maximum increase of the efficiency is more than 7.46, which indicates that the efficiency of the propeller is high.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U664.33

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