The Evaluation of Propeller Boss Cap Fins Effects for Different Pitches and Positions in Open Water Conditions

IF 0.5 4区 工程技术 Q4 ENGINEERING, MARINE
Burak Göksu, Murat Bayraktar, O. Yüksel
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引用次数: 0

Abstract

The operation of marine vessels with high efficiency provides a great contribution within the scope of the International Maritime Organization and the sustainable development goals. In terms of the propulsion system, selecting the appropriate propeller is critical to effectively use the engine power installed in marine vessels because the biggest energy losses during transmission occur on the propeller and ship hull. Increasing propeller efficiencies above a certain level is quite a challenge by simply changing the number of blades, pitch, or propeller type. Therefore, various energy-saving device applications, such as propeller boss cap fins (PBCFs), are performed on the ship propeller. The effects of National Advisory Committee for Aeronautics 4415 profile PBCFs which have a different position and pitch angle integrated into the E698 model propeller have been investigated to describe efficiency, vortex, and pressure distributions based on the KRISO very large crude carrier 2 designed hull in this study. The E698 model propeller has been created by the 3D software and the validation has been performed by the computational fluid dynamic solver software based on the reference values of the propeller. The effect of four PBCF applications which have different pitches and positions on the model propeller has been revealed in terms of the efficiency, pressure distributions, and vortexes. Although P45-R45 and P45-R90 PBCF applications are quite close to the E698 propeller in terms of efficiency, no significant efficiency increase has been observed. In addition, the efficiency has decreased considerably in P90-R45 and P90-R90 applications. PBCFs application with P45-R90 has provided superiority to the base model in terms of pressure distributions and vortex formation. However, any improvement has not been achieved in the remaining three designs. Therefore, PBCF applications should be applied quite elaborately based on propeller types.
评估开阔水域条件下不同倾角和位置的螺旋桨头盖鳍效应
在国际海事组织和可持续发展目标的范围内,海洋船舶的高效运行做出了巨大贡献。在推进系统方面,选择合适的螺旋桨对于有效利用船舶上安装的发动机功率至关重要,因为在传输过程中,最大的能量损失发生在螺旋桨和船体上。要将螺旋桨的效率提高到一定水平以上,仅靠改变叶片数量、螺距或螺旋桨类型是相当困难的。因此,在船用螺旋桨上应用了各种节能装置,如螺旋桨顶盖翅片(PBCF)。本研究以 KRISO 超大型原油运输船 2 号设计的船体为基础,研究了 E698 螺旋桨模型中不同位置和螺距角的 4415 型 PBCF 的效果,以描述效率、涡流和压力分布。E698 模型螺旋桨由三维软件创建,并根据螺旋桨的参考值由计算流体动力学求解软件进行验证。四种不同螺距和位置的 PBCF 应用在效率、压力分布和涡流方面对模型螺旋桨的影响得到了揭示。尽管 P45-R45 和 P45-R90 的 PBCF 应用在效率方面与 E698 螺旋桨相当接近,但并未观察到效率的显著提高。此外,P90-R45 和 P90-R90 的效率也大幅下降。PBCFs 与 P45-R90 的应用在压力分布和涡流形成方面优于基本模型。然而,其余三种设计均未取得任何改进。因此,PBCF 应用应根据螺旋桨类型进行精心设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
1.10
自引率
0.00%
发文量
19
期刊介绍: Original and timely technical papers addressing problems of shipyard techniques and production of merchant and naval ships appear in this quarterly publication. Since its inception, the Journal of Ship Production and Design (formerly the Journal of Ship Production) has been a forum for peer-reviewed, professionally edited papers from academic and industry sources. As such it has influenced the worldwide development of ship production engineering as a fully qualified professional discipline. The expanded scope seeks papers in additional areas, specifically ship design, including design for production, plus other marine technology topics, such as ship operations, shipping economics, and safety. Each issue contains a well-rounded selection of technical papers relevant to marine professionals.
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