Abstract: Particle image velocimetry was used to study the tube inserted with three-blade rotor, tube inserted with two-blade rotor and tube without rotor, and flow fields of these tubes were obtained. The results revealed that the difference of distribution of the axial velocity along the radius between the tubes inserted with three-blade rotor of small lead and two-blade rotor was not distinct, near M type distribution was demonstrated, but the distribution of radial velocity along the radius of the tube inserted with three-blade rotor was obviously higher than that of two-blade rotor, and so was the distribution of the turbulent kinetic energy along the radius. The attenuation length of turbulent kinetic energy was characterized as the quantity of action range of one rotor, when one rotor was placed into the tube, the turbulent kinetic energy decayed gradually and became stable at a constant value at a distance of 10 mm, so the length of action range of Jienengxin rotor was regarded as 10 mm, which could be instructive to industrial application.

Key words: particle image velocimetry, rotor, turbulent kinetic energy, flow field

摘要： 采用粒子图像测速技术对安装三叶片转子的圆管、安装两叶片转子的圆管及光管进行实验研究，获得了换热管内流场的分布情况. 结果表明，圆管内安装小导程三叶片转子的轴向速度沿径向的分布与圆管内安装两叶片转子差异不明显，均呈近M型分布，但径向速度沿径向的分布明显大于两叶片转子，且湍动能沿径向的分布也高于两叶片转子. 以湍动能的衰减长度作为表征单个转子的作用范围量，在管内放置单个转子后，湍动能逐渐衰减，并在经过约10 mm距离后稳定在一恒定值附近，因此，认为洁能芯转子的作用范围长度为10 mm，这对工业应用具有重要意义.

关键词: 粒子图像测速, 转子, 湍动能, 流场