旋风分离器高温流场的实验测量

引言对旋风分离器内流场的认识是研究其分离过程的基础.长期以来,人们对旋风分离器内流场的结构、速度分布等进行了大量的测量和分析,认识到旋风分离器内是一个三维强旋旋湍流场.

Experimental measurement on flow field in a high-temperature cyclone separator

The high temperature gas flow field in a PV^TM cyclone separator was measured by using a specially-fabricated，hemispherical five-hole pitot probe.The temperature of test air ranged from 293 K to 973 K and the cyclone inlet velocity from 16 m·s^-1 to 36 m·s^-1.The experimental results showed that the three-dimensional velocity components are good in axisymmetry and similarity along the axis but the tangential velocity value attenuated down the axis.The non-dimensional tangential velocity increased slightly and the dividing surface between inner and outer vortex also moved outwards with the increase of inlet velocity.With the rise of gas temperature，the tangential velocity decreased and its attenuation along the axis became greater.The effect of the gas temperature and inlet velocity can be reflected by a Reynolds number based on the axial flow in the vortex finder and an empirical expression for the maximum non-dimensional tangential velocity vs.Re was given.