Circumferential Pressure Distributions in a Model Labyrinth Seal,
HERIOT-WATT UNIV EDINBURGH (SCOTLAND)
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Leakage flow through labyrinth glands had long been known to affect rotor stability but its effects have been often underestimated. A research programme to isolate and study this cause of instability has been initiated. Circumferential pressure distributions are measured in the labyrinth glands with geometry appropriate to the high pressure labyrinths in large steam turbines. Knowledge of this pressure distribution is essential as it is this unequal pressure field that results in the destabilising force. Parameters that are likely to affect the pressure distributions are incorporated into the test rig. Some preliminary pressure profiles are presented.