Experimental research on rotors axis locus and leakage characteristics of brush seal with low front plate at clearance/transition/interference fit states was carried out. The rotors axis locus was measured by using eddy current sensor. The results showed that: rotors axis locus became smaller with increase of differential pressure when the differential pressure was less than 0.4MPa. Rotor's axis locus didn't vary with differential pressure when the differential pressure exceeded 0.4MPa. Rotor's axis locus didn't affect the leakage characteristics of brush seals for different fit states if wear was not taken into account. This could ensure the safety and effectiveness of the experiment rig. Based on this

the effects of rotational speed

differential pressure and sealing clearance on leakage characteristics were studied. The result shows that: leakage coefficients increase with the increment of the rotational speed. Brush seals have obvious hysteresis under clearance fit and inconspicuous hysteresis under interference fit. The effect of wear on leakage characteristics is obvious at interference fit state. Leakage coefficients of brush seal increase with the increment of differential pressure ranging from 0.1 to 0.2MPa under clearance fit

and decrease when the differential pressure is 0.3MPa

and tend to be stable when the differential pressure exceeds 0.3MPa. Leakage coefficients of brush seal show an increasing trend with the increment of differential pressure under clearance fit

and the increasing trend slows down and leakage coefficients enter into a stable state when the differential pressure ranges from 0.3 to 0.5MPa.