Experimental Study of Turbulent Kinetic Energy Distribution Characteristics of Double-Propeller Jet in Restricted Waters

doi:10.3969/j.issn.1674-0696.2025.12.10

Abstract

Abstract: The distribution characteristics of turbulent kinetic energy of double-propeller jet are directly related to the dissipation of water flow energy and have important impacts on the erosion of hydraulic structures and water environment safety in restricted waters. Based on indoor PIV water flume experiments, the turbulent kinetic energy distribution characteristics of double-propeller jet in restricted waters were studied, and the influence rules of section coefficient, propeller pitch and rotational speed on the turbulent kinetic energy distribution in the jet action zone were explored. The results show that in the restricted water area, the turbulent kinetic energy reaches its peak at approximately 0.5 times the propeller diameter (Dp) behind the propeller and then decays. The maximum turbulent kinetic energy on the outer profile of the propeller decays by 50% compared to the profile where the propeller is located, and the central profile of the hull decays by 65%. The vertical distribution shows an inverted “J” shape, and there is a significant “inflection point” where the rate drops sharply on the attenuation curve. The reduction of section coefficient will limit the vertical diffusion range of the double-propeller jet, and the attenuation rate of turbulence kinetic energy along the path will decrease. An increase in pitch expands the turbulence range of the jet, leading to a significant decrease in turbulence kinetic energy at the intersection area of the hulls central profile. An increase in propeller rotational speed will significantly enhance water turbulence and expand the diffusion range of turbulent kinetic energy. The turbulent kinetic energy of the propeller center and outer jet is most significantly affected by rotational speed.

Key words: hydraulic engineering; restricted waters; double-propeller jet; turbulent kinetic energy distribution; PIV flume test

摘要： 双螺旋桨射流紊动能的分布特性直接关系到水流能量耗散，对限制水域水工结构冲刷和水环境安全等具有重要影响。基于室内PIV水槽试验，研究了限制水域双螺旋桨射流的紊动能分布特性，探讨了断面系数、螺旋桨桨距及转速对射流作用区紊动能分布的影响规律。结果显示：限制水域中，紊动能在桨后约0.5倍螺旋桨直径Dp处达到峰值，随后衰减，螺旋桨外侧剖面紊动能最大值较桨所在剖面衰减50%，船体中心剖面衰减65%。垂向分布呈倒“J”型，且在衰减曲线上存在明显速率突降的“拐点”；断面系数的减小会限制双螺旋桨射流的垂向扩散范围，紊动能沿程衰减速率降低；桨距增大使射流紊动范围扩大，将导致船体中心剖面交汇区处的紊动能明显下降；螺旋桨转速提高将显著增强水体紊动，加大紊动能的扩散范围，螺旋桨中心及外侧射流的紊动能受转速影响最为明显。

关键词: 船道工程；限制水域；双螺旋桨射流；紊动能分布； PIV水槽试验

CLC Number:

ZHONG Liang1,2，LIANG Weikun1，GU Mengting1，YANG Xuanxu1. Experimental Study of Turbulent Kinetic Energy Distribution Characteristics of Double-Propeller Jet in Restricted Waters[J]. Journal of Chongqing Jiaotong University(Natural Science), 2025, 44(12): 80-88.

钟亮1,2，梁伟坤1，古梦婷1，杨漩溆1. 限制水域双螺旋桨射流紊动能分布特征试验研究[J]. 重庆交通大学学报（自然科学版）, 2025, 44(12): 80-88.

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