旋风分离器内非轴对称旋转流场的测量

Experimental Measurement of Non-axisymmetric Rotating Flow Field in Cyclone Separator

采用相位多普勒分析仪研究了不同入口旋风分离器气相非轴对称流场。首先采用圆管层流实验验证测量系统的准确性,然后考察不同入口结构下直筒型旋风分离器内部流场的分布特点。实验测得的切向、轴向速度,湍流度分布与旋风分离器典型流场分布特点一致。对比3种入口结构旋风分离器测量结果发现,随着入口结构轴对称性逐渐增加,其内部流场分布的非轴对称性明显减小,旋转中心与旋风分离器几何结构中心之间的偏心距也明显减小,有利于提高旋风分离器的分离效率并降低因涡核摆动造成的摩擦阻力。合理地布置入口结构是抑制单入口旋风分离器非轴对称旋转流动,提高旋风分离器性能的有效手段之一。

The non-axisymmetric rotating flow field in cyclone with different inlet structures was studied by phase Doppler analyzer. The accuracy of the measurement system was verified by circular tube laminar flow experiment, and then the internal flow field distribution in cyclone tube with different inlet structures was researched. The measured results showed a good agreement with the typical cyclone flow filed distribution. The non-axisymmetry of the internal flow field obviously decreased with the increasingly axial symmetry of inlet structure by compared with the measured results of three inlet structures. And the eccentric distance between the swirl flow center and the geometric center also reduced, contributing to improve the collection efficiency and reduce frictional resistance induced by vortex core oscillating. Therefore, reasonable arranging inlet structure is obviously one effective method to restrain the non-axisymmetric rotating flow in single inlet cyclone separator and to improve the performance of cyclone separator.