轴承腔两相流动流型特征参数及鲁棒性分析

航空发动机轴承腔的润滑设计和换热分析依赖于对轴承腔中润滑介质两相流动特性的理解,依据流型进行轴承腔油气两相介质流动研究是获取流动特性的有效途径。针对通过试验判断油气两相介质流动形式的需要,结合数值分析和试验数据,在辨识能力和试验获取等方面的考虑前提下,提出了辨识航空发动机轴承腔中均相流动与含油滴气/液分层流动两种主要油气两相流型的特征参数——体积含油率和无量纲速度,探讨了两个特征参数在较宽工况范围内保持流型辨识能力的鲁棒性。研究工作对于借助于试验判断油气两相流型,从而可以在严谨理论指导下基于流型进行航空发动机轴承腔润滑介质两相流动特性分析,实现准确高效的润滑设计和换热分析的设计路线实施是很有意义的工作。

Exploring How to Realize Accurate and Efficient Lubrication Design and Heat Transfer Analysis for Oil/Air Two-Phase Flow in Bearing Chamber

Sections 1 through 4 of the full paper explain our exploration which we believe can lead to obtaining lubrication design and heat transfer analysis that are more accurate and effective than previous ones.Their core consists of: "The lubrication design and the heat transfer analysis in the bearing chamber of an aero-engine depend on our understanding of its lubricant two-phase flow characteristics.Researching on the oil/air two-phase flow based on flow pattern is an effective approach to obtaining the flow characteristics.According to the need of determining the oil/air two-phase flow form by experiments,considering the identification ability and experiment accessibility,the flow pattern characteristic parameters are proposed with numerical analysis and experimental results,and their robustness about the identification ability in broader operating conditions are discussed;the flow pattern characteristic parameters refer to volume oil content and dimensionless velocity,which are used to identify the homogeneous flow and oil/air(oil drops) stratified flow(the two primary oil/air two-phase flow in bearing chamber)." The results of our exploration,presented in Figs.2,3 and 4,and their analysis show preliminarily that our exploration is indeed a significant work for realizing accurate and efficient lubrication design and heat transfer analysis.