A rotating experiment rig with high rotational speeds was designed for the experiment of labyrinth seal in a compressor stator well. The influences of rotational speed (1500-8100r/min) on the working tip clearance

leakage characteristic

windage heating and swirl characteristics at different pressure ratios (1.05-1.30) were studied. Results show that the working tip clearance decreases and the mass flow rate declines with the increasing of the rotational speed. For low pressure ratios

increasing the rotational speed results in falling discharge coefficient

while the variation of discharge coefficient is relatively small for high pressure ratios. The windage heating of system increases as the rotational speed increases. Higher rotational speed gives much larger temperature rise. In addition

it is obvious that increasing the rotational speed leads to an increase of the swirl ratio at a specific radial location. However

the swirl ratio shows a decrease with increasing radius in the outlet cavity.