液体火箭发动机超高转速泵浮动密封环研究

浮动密封环作为非接触式液体间隙密封，具有密封压差大、泄漏量较小、能自动调心和对中、理论上无磨损、对转子有辅助支撑作用等优点。但它在工作时受力状态很复杂，液膜形成和最小液膜厚度的大小受到许多因素的影响，泄漏量的计算与普通工作状态有较大的差别。本文通过对一些重点因素的分析研究，结合产品在不同工作转速和介质中的试验情况，提出了浮动环的工作模式，确定了最小液膜厚度和泄漏量的计算方法和在结构设计和产品生产过程中应重点考虑的问题。

Study on Floating Seal Ring of Hyper-rotate-speed Pump in Liquid Rocket Engine

The floating seal ring is a non-touch liquid clearance seal with lots of advantages: large differential pressure, small through-flow, automatically center adjusting and centering, non-friction in theory, providing auxiliary support for the rotor. The operation loads of the seal ring are very complex, and many factors influence the form and size of the liquid film. The calculation of through-flow is much different from those of the common working status. Focused on some important factors, this paper analyzed many test results of the ring under varying duty and different working fluids conditions, summarized the working mode of the ring, provided the equations for the calculations of the size, minimal film thickness and the sealing gap through-flow, pointed out some key elements in structure design and product manufacture.