Taylor-Couette流场特性的PIV测量及数值模拟
发布时间：2018-10-31 14:38
【摘要】：采用粒子成像速度场仪(PIV)和数值模拟(CFD)对Taylor-Couette流场进行测量,获得各转速下涡流场信息。将同等条件下PIV测量结果与数值模拟结果相联系,对比分析不同旋转雷诺数范围内涡流场中不同径线和中轴线上各向速度的变化特征。结果表明,各种特征存在一定的转速分段范围:在2~7r/min(Re为100~350)时,各向速度特征为层流涡特性,在7~40r/min(Re为350~2000)时,各向速度特征为波状涡特性,在40~60r/min(Re为2000~3000)时,各向速度特征为调制波状涡特性,当转速大于60r/min(Re大于3000)时,各向速度特征为湍流涡特性。根据不同角度获得的各向速度特征对应的内筒转速、旋转雷诺数与流场涡形态的关系,明确分析出特定几何条件下,泰勒涡发生形态转变的旋转雷诺数,以便于深入探究泰勒涡流场的特性,定量分析涡运动形态特征。
[Abstract]:Particle imaging velocimeter (PIV) and numerical simulation (CFD) were used to measure the flow field of Taylor-Couette. The results of PIV measurements under the same conditions are correlated with the results of numerical simulation, and the variation characteristics of the velocities of different tracks and axes in the eddy current field in the range of different rotational Reynolds numbers are compared and analyzed. The results show that there is a certain speed segmented range of the various characteristics: when 2~7r/min (Re is 100,350), the velocity characteristics of each direction are laminar vortex characteristics, and in the case of 7~40r/min (Re = 350 ~ 2000), the velocity characteristics of each direction are wavy vortex characteristics. When 40~60r/min (Re = 2000000), the velocity characteristic of each direction is the characteristic of modulated wave vortex, and when the rotational speed is larger than 60r/min (Re > 3000), the characteristic of each direction velocity is turbulent vortex characteristic. According to the relationship between the rotational speed of the inner cylinder, the rotational Reynolds number and the vortex shape of the flow field obtained from different angles, the rotational Reynolds number of the Taylor vortex-generating morphology transformation under certain geometric conditions is clearly analyzed. It is convenient to probe into the characteristics of Taylor eddy current field and to quantitatively analyze the characteristics of vortex motion.
【作者单位】： 兰州交通大学环境与市政工程学院;甘肃省建筑设计研究院;
【基金】：国家自然科学基金(51268025,51468029)资助 甘肃省自然科学基金项目(145RJZA131)
【分类号】：O35
，
本文编号：2302560
[Abstract]:Particle imaging velocimeter (PIV) and numerical simulation (CFD) were used to measure the flow field of Taylor-Couette. The results of PIV measurements under the same conditions are correlated with the results of numerical simulation, and the variation characteristics of the velocities of different tracks and axes in the eddy current field in the range of different rotational Reynolds numbers are compared and analyzed. The results show that there is a certain speed segmented range of the various characteristics: when 2~7r/min (Re is 100,350), the velocity characteristics of each direction are laminar vortex characteristics, and in the case of 7~40r/min (Re = 350 ~ 2000), the velocity characteristics of each direction are wavy vortex characteristics. When 40~60r/min (Re = 2000000), the velocity characteristic of each direction is the characteristic of modulated wave vortex, and when the rotational speed is larger than 60r/min (Re > 3000), the characteristic of each direction velocity is turbulent vortex characteristic. According to the relationship between the rotational speed of the inner cylinder, the rotational Reynolds number and the vortex shape of the flow field obtained from different angles, the rotational Reynolds number of the Taylor vortex-generating morphology transformation under certain geometric conditions is clearly analyzed. It is convenient to probe into the characteristics of Taylor eddy current field and to quantitatively analyze the characteristics of vortex motion.
【作者单位】： 兰州交通大学环境与市政工程学院;甘肃省建筑设计研究院;
【基金】：国家自然科学基金(51268025,51468029)资助 甘肃省自然科学基金项目(145RJZA131)
【分类号】：O35
，
本文编号：2302560
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