船式拖拉机底板非光滑表面减阻机理研究  

Research on Drag Reduction Mechanism of Non-smooth Surface for Bottom Plate of the Boat-tractor

作　　者：周明刚[1,2] 陈龙 刘明勇[1,2] 郭凤 Zhou Minggang;Chen Long;Liu Mingyong;Guo Feng(Research and Design Institute of Agricultural Mechanical Engineering,Hubei University of Technology,Wuhan 430068,China;Research and Design Institute of Agricultural Mechanical Engineering in Hubei Province,Wuhan 430068,China)

机构地区：[1]湖北工业大学农机工程研究设计院,武汉430068 [2]湖北省农业机械工程研究设计院,武汉430068

出　　处：《农机化研究》2019年第7期258-263,共6页Journal of Agricultural Mechanization Research

基　　金：湖北省科技厅重大专项(2016ABA091)

摘　　要：基于Fluent软件对船式拖拉机底板建立三维模型,采用数值模拟的方法研究非光滑表面凹坑结构对机身底板的减阻影响。研究非光滑表面凹坑在不同深度、直径下滑行阻力的影响规律,选取最优的凹坑组合成等距排列、等差排列、菱形排列3种结构。分析凹坑结构的减阻机理,发现压差阻力增大、摩擦阻力减小是总阻力减小的原因。结果表明:船式拖拉机凹坑结构具有良好的减阻效果;相比光滑的船式拖拉机底板,非光滑表面凹坑直径为8mm,深度为5mm的等距排列结构的减阻率达到了5. 4%。A three-dimensional model of boat tractor was built based on the Fluent in thesis,and the influence of the non-smooth surface pits on the fuselage floor was studied by numerical simulation.After the influence under different depth and diameter was studied,the most optimal pits composed of isometric,arithmetic and rhombus was chose.The drag reduction mechanism of pit structure was analyzed,it is found that the pressure resistance increases and the frictional resistance reduce is the reason for the total resistance reduce.The result shows that compared with a smooth boat tractor,non-smooth surface pit structure has better drag reduction effect.The drag reduction efficiency of non-smooth surface pit structure has reached 5.4%,which has equidistant alignment structure with 8mm diameter and 5mm depth.

关 键 词：船式拖拉机 减阻机理 凹坑结构 非光滑表面 

分 类 号：S219.81[农业科学—农业机械化工程]