液相和多相环境下环形动密封泄漏流动和转子动力特性的研究进展

To meet the requirements of the high efficiency and stability for compressors and pumps at full load operations, numerous theoretical and experimental studies have been conducted for annular dynamic seals working in pure liquid and multiphase environments, focusing on the special seal leakage and rotordynamic performance. Firstly, the application background in pure liquid and multiphase environments, as well as the fluid-induced excitation mechanism and the mathematical model of rotordynamic coefficients, is introduced for annular dynamic seals. Secondly, the recent advances in the performance analysis method and geometry design are summarized for the annular dynamic seals in pure liquid. The research status of the leakage flow, drag loss and rotordynamics is also introduced for the annular dynamic seals in gas-liquid two-phase (gas in liquid) conditions. What is more, the main conclusions from the experimental measurements and numerical simulations on the leakage flow and rotordynamic coefficients are discussed for the annular dynamic seal in wet gas conditions. Finally, based on the summarized experimental, numerical and theoretical studies on the performance of the annular dynamic seals in pure liquid and multiphase fluids, further research topics are proposed for the annular dynamic seals in multiphase conditions. For the annular dynamic seal in pure fluid, the experimental measurement techniques have been developed, as well as numerous numerical methods based on the BULK FLOW model and CFD. Consequently, high-efficient vibration suppression method and advanced liquid damper seal need to be developed. For gas-liquid two-phase seals, the seal leakage and rotordynamic characteristics have been investigated on test rigs in laboratory, mainly focusing on the effects of gas volume factor and liquid volume factor. Therefore, high-accuracy numerical prediction method and two-phase flow mechanism in seal clearance need to be further researched.