Abstract
Abstract This work presents a gas-liquid miscible backflow pumping seal (G-LMBPHS) aimed to seal lubricating oil in a high-speed bearing chamber as presented in this paper. The sealing mechanism and performance of the G-LMBPHS are numerically investigated and validated experimentally with a visualization test device, and the theoretical results fundamentally accord with the experimental values. The results reveal that G-LMBPHS uses high pressure fluid generated by the hydrodynamic effect of the groove to prevent the leakage of lubricating oil. When the shearing action generated by the rotational speed completely cancels out or even exceeds the pressure, G-LMBPHS can achieve perfect sealing with no any leakage of the lubricating oil. And G-LMBPHS designed in this study will have wide applications in engineering.
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