摘要
为研究静水环境下幼鱼摆尾-滑行时的推、阻力形成过程和鱼体周身流体作用机理,以草鱼幼鱼(Ctenopharyngodon idella)为研究对象,利用粒子图像测速技术(PIV)测量了草鱼幼鱼周身流场,计算了草鱼幼鱼周身由流体正压和流体负压产生的作用力,比较了草鱼幼鱼头、中、尾部产生的推、阻力占比和游泳效率。结果表明:摆尾阶段的幼鱼推力主要来源于流体负压;滑行阶段的幼鱼则主要依靠鱼体周身流体正压形成的推力推动自身前进。整个摆尾-滑行周期内,草鱼幼鱼尾部流体形成的推力占总推力的48.81%,是推力的主要产生部位,且尾部的平均游泳效率(77.28%±16.87%)要明显高于头部和中部;草鱼幼鱼中部集中的阻力最多,占总阻力的67.82%,是幼鱼的主要阻力形成部位。
The formation of thrust and drag forces and the fluid dynamics around juvenile fish bodies during burst-and-coast swimming were investigated by using Particle Image Velocimetry(PIV)to capture fluid pressure distribution around juvenile grass carp(Ctenopharyngodon idella).The forces generated by positive and negative fluid pressures were calculated,and the ratio of thrust and drag forces as well as the swimming efficiency were compared across the head,middle,and tail regions of the fish body.Results indicate that during the bursting,thrust force is primarily generated by negative fluid pressure,whereas during coasting,the forward swimming mainly relies on the thrust generated by positive fluid pressure.Throughout the burst-and-coast cycle,the tail region contributes significantly to thrust generation(48.81%of total thrust),exhibiting the highest average swimming efficiency(77.28%±16.87%).Conversely,the middle region of juvenile grass carp experiences the highest drag force(67.82%of total drag).
作者
胡晓
陈伟
黄慧玲
张奔
杨国党
石小涛
龙泽宇
HU Xiao;CHEN Wei;HUANG Hui-ling;ZHANG Ben;YANG Guo-dang;SHI Xiao-tao;LONG Ze-yu(College of Hydraulic&Environmental Engineering,Three Gorges University,Yichang 443002,China;HubeiInternational Science and Technology Cooperation Base of Fish Passage,Three Gorges University,Yichang 443002,China;Shanghai Investigation,Design and Research Institute Co.,Ltd.,Shanghai 200050,China;Huaneng Tibet Yaluzangbu River Hydropower Development Co.,Ltd.,Lhasa 850000,China)
出处
《长江科学院院报》
CSCD
北大核心
2024年第8期82-89,共8页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金项目(51609125)
国家自然科学基金面上项目(52279069)
国家自然科学基金优秀青年科学基金项目(51922065)
湖北省高等学校优秀中青年科技创新团队计划项目(T201703)。
