摘要
根据流体力学原理,分析静止管道的旋涡脱落;根据管道旋涡脱落原理,建立高雷诺数下静止管道的物理模型及数学模型;通过数值分析,得出在绕流问题中雷诺数是决定流型的主要因素,在不同的雷诺数下,旋涡脱落也随之不同;升力系数和阻力系数曲线在涡稳定脱落后呈周期性变化,幅值不变,且阻力的脉动频率是升力的2倍,得到涡脱落的位置与管壁切应力的关系以及绕流时管道的压力分布情况.
On the basis of hydrodynamics,the vortex shedding condition was investigated.After theoretical analysis of shedding,physical and mathematic models of the pipe were established under high Reynolds number.The numerical results demonstrate that Reynold number is the major factor controlling the flow.Under different high Reynolds numbers,there is different vortex shedding condition.The lift coefficient and resistance coefficient changes periodically and the amplitude is held constantly,and the pulsation frequency of resistance is twice as much as that of the lift.The relationship between position of vortex shedding and tangent force of pipe wall and pressure distributing around pipe was derived.
出处
《大庆石油学院学报》
CAS
北大核心
2007年第6期90-94,共5页
Journal of Daqing Petroleum Institute
关键词
管道
旋涡脱落
雷诺数
升力系数
阻力系数
压力分布
pipe
vortex shedding
Reynolds number
lift coefficient
resistance coefficient
pressure distribution
