Abstract: Laser Doppler velocimetry (LDV) was used to measure the flow field in order to study how a stick reduced the pressure drop in the cyclone separator.According to the characteristics of the flow field, it was found that the stick generated a strong flow wake in the cyclone separator, and different shapes of flow wake resulted from different types of the stick.Experimental results also showed that the size and shape of the stick cross-section made a prominent effect on the strength and shape of flow wake.For the same shape of stick cross-section,the wider the stick cross-section was,the greater the tangential time-averaged velocity and root-mean-square velocity,and the shape of flow wake also changed.While for the same width of stick cross-section, the rectangular stick had a stronger effect on the flow field than the circular one. Because there was a direct relationship between the type of stick and the pressure drop reduction of the cyclone separator, the mechanism of pressure drop reduction could be analyzed by studying the flow wake.

Key words: 旋风分离器, 减阻杆, 流动分析, 绕流尾涡, 激光多普勒测速仪

摘要： 利用激光多普勒测速仪(LDV)对装有减阻杆的旋风分离器内流场进行了详细测量，根据流场分布的特点发现在减阻杆后存在明显的绕流尾涡区.对比实验的结果表明不同结构型式的减阻杆后绕流尾涡区的流动分布不同，其中减阻杆的迎风宽度及形状对减阻杆后绕流尾涡区的流动分布有明显影响.由于减阻杆的迎风宽度及形状与减阻性能有关，因此通过对减阻杆后绕流尾涡区的流动分析可以进一步揭示旋风分离器内减阻杆的减阻机理.

关键词: 旋风分离器, 减阻杆, 流动分析, 绕流尾涡, 激光多普勒测速仪