影响三瓣式高速浮环密封性能的敏感参数

针对应用在液体火箭发动机上的三瓣式高速浮环密封（TFRS），揭示密封在复杂多变工况下的泄漏特性和磨损特性，得到影响密封特性的敏感参数，促进高速密封技术的发展。针对压力、转速和密封周向弹簧比压等关键敏感参数，数值模拟了密封的泄漏率变化规律，试验测量了密封环的泄漏率和磨损率。研究结果表明:泄漏率和磨损率都随压力增大而增大；转速对三瓣式高速浮环密封磨损率敏感，对密封泄漏率不敏感，随着转速的增加，磨损率增大较快，泄漏率减小较慢；随着密封周向弹簧比压的增大，前期密封周向弹簧比压对泄漏率敏感，此时泄漏率变化幅度较大，磨损率变化幅度较小，后期密封周向弹簧比压对磨损率敏感，此时磨损率变化幅度较大，泄漏率变化幅度较小，密封周向弹簧比压在适当范围内时，泄漏率和磨损率都较小。研究结果为液体火箭发动机三瓣式高速浮环密封的设计、实际应用和深入研究提供了基础。 

Sensitive parameters affecting performance of three-petal high-speed floating-ring seal

In view of the three-petal high-speed floating-ring seal (TFRS) applied in liquid rocket engine, the leakage and wear characteristics of the seal under complex and changeable conditions are revealed, and the sensitive parameters affecting the sealing characteristics are obtained, which promotes the development of high-speed seal technology. According to the key parameters of pressure, rotational speed and circumferential spring specific pressure of the seal, the leakage rate of TFRS was simulated numerically, and the leakage rate and wear rate of TFRS were measured experimentally. The analysis results show that the leakage rate and wear rate increase with the increase of pressure. Speed is sensitive to TFRS wear rate and insensitive to TFRS leakage rate. With the increase of speed, wear rate increases rapidly and leakage rate decreases slowly. With the increase of spring specific pressure of the seal, the earlier spring specific pressure of the seal are the sensitive parameters affecting the leakage rate. At this time, the leakage rate changes greatly and the wear rate changes slightly. The later spring specific pressure of the seal are the sensitive parameters affecting the wear rate. At this time, the wear rate changes greatly and the leakage rate changes slightly. The leakage rate and wear rate are smaller in the appropriate range of spring specific pressure of the seal. The research results provide a basis for the design, application and in-depth study of TFRS for liquid rocket engines.