Abstract
The sealing performance and the deterrence performance of gas blowout of a sealant self-circulated viscoseal, which is a kind of noncontact seal, are described. Most of the experimentally determined sealing performances are inferior to the theoretical sealing performances, because eccentricity of the circumferential pressure occurs when the viscoseals are horizontal. First, the circumferential and axial pressure distributions are simulated under the assumption that the resultant force generated in sealant is based on not only the pressurized force but also gravity and the centrifugal force. The corrected sealing performance, which is simulated by taking into account the resultant force based on the above named forces are in good agreement with the experimental results. Second, both the gas-liquid interface and the ingested gas motion are seen by observation of naked eye and flow visualization. The regime diagrams of flow in sealant are ensured. Also, it is confirmed that a small amount of self-circulated sealant causes sufficient deterrence of gas blowout in spite of both a high number of screw shaft revolutions and a high cover gas pressure.
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