Abstract
Rotational effect on a labyrinth seal was examined experimentally using a scale test apparatus. Numerical study was also done for understanding seal phenomena for that model. The experiment was performed under the condition of the labyrinth clearance equals to 4,8,12[mm], the inlet pressure (P_in) at test section as 101.4-238.4[kPa] and rotational speed of the model as 0-4000[rpm]. It was observed that discharge coefficient decreasing linearly as increasing the pressure ratio (P_in/P_out' P_out : atmospheric pressure) at O[rpm] for almost whole pressure region studied. On the other hand discharge coefficient decreasing rapidly as increasing the pressure ratio at high rotational speed conditions (2000[rpm] and 4000[rpm]). Numerical simulation clarified that the rotational effect obviously appears in the flow pattern in the clearance region of the labyrinth seal as the difference of both the position and the scale of the vortex formed in that region.
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