摘要
船式拖拉机在作业过程中产生摩擦阻力和兴波阻力,其严重影响工作性能和种苗的播种质量。为了降低船式拖拉机在水田行走过程中的阻力通过旋转流变仪试验测定泥浆参数,基于CFD算法建立VOF流体体积函数的空气和泥浆双相流的船体滑行模型,研究船式拖拉机的前进速度对摩擦阻力和兴波阻力及波高的影响。研究表明,摩擦阻力和兴波阻力及波高随速度增大而增大;当凹弧船壳前进速度为2 m/s时,凹弧船壳相对于平船壳船首和船尾兴波高度分别降低0.047 m和0.025m;减阻率为5.3%的结论。
The friction resistance and wave-making resistance of ship tractor in the process of operation seriously affect the working performance and sowing quality of seedlings.In order to reduce the resistance of ship tractor in paddy field,mud parameters are measured by rotary rheometer test.Based on CFD algorithm,hull sliding model of VOF air and mud two-phase flow is established,and the influence of forward speed of ship tractor on friction resistance,wave building resistance and wave height is studied.The results show that the frictional resistance,wave-making resistance and wave height increase with the increase of velocity.When the forward speed of concave arc hull is 2m/s,the wave height of concave arc hull is 0.047m and 0.025m lower than that of flat hull,respectively.The drag reduction rate is 5.3%.
作者
杨晖
周敬东
YANG Hui;ZHOU Jingdong(Hubei University of Technology Wuhan 430068,China;Hubei Agricultural Machinery Engineering Research and Design Institute,Wuhan 430068,China)
出处
《机械设计与研究》
CSCD
北大核心
2019年第6期220-224,共5页
Machine Design And Research
基金
国家自然科学基金(51405142)
湖北省科技厅重大专项(2016ABA091)资助项目。
关键词
船式拖拉机
兴波阻力
摩擦阻力
波高
ship一type tractor
wave resistance
frictional resistance
wave height
