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.