航空发动机轴承腔气液两相流型研究

项目名称： 航空发动机轴承腔气液两相流型研究

项目编号： No.51506087

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 能源与动力工程

项目作者： 鹿鹏

作者单位： 南京航空航天大学

项目金额： 21万元

中文摘要： 轴承腔是航空发动机的重要部件，对腔内气液两相流动状态的理解有助于提高发动机的润滑效率、提升发动机的工作性能和可靠性。本项目拟通过数值模拟、理论分析和实验验证相结合的研究方法，首先基于双向耦合模型计算方法，数值研究各种工况条件对腔内气液两相流动特征的影响机理；然后引入先进的信号分析方法Hilbert-Huang变换（HHT），并对原始HHT算法的潜在问题做改进，建立差压信号频谱特征与流型的关联，提取可反映流型差异的特征参数，形成轴承腔气液两相流型的判别准则；最后通过相位多普勒粒子分析仪PDPA在实验台上对数值模拟和信号分析的结果进行验证，从而进一步修正数值模型并完善流型判别准则，掌握各工况条件对流型的影响规律，以期实现对流型的调控，确保航空发动机系统的稳定安全工作。项目的实施将完善航空发动机内部气液两相流理论，为航空发动机系统的设计和运行提供理论和技术支撑。

中文关键词： 气液两相流；流型；数值模拟；Hilbert-Huang变换；准则

英文摘要： The bearing chamber is an important component in aero engine. To understand the oil /air two phase flow conditions in the bearing chamber is beneficial to improve the lubrication efficiency，working performance and reliability of an aero engine. Numerical simulation, theoretical analysis, and experimental verification will be combined in this project. Firstly, based on two-way coupling model, numerical study will be performed towards the influence mechanism of working conditions on the gas-liquid two phase flow characteristics. Secondly, Hilbert-Huang Transform (HHT) will be introduced and potential problems caused by original algorithm will be modified. The relationship between the signal spectrum and flow regime will be established by HHT. After that, the criterion for flow regime will be built, which can reflect the different flow regimes appropriately. Finally, in order to improve the numerical model and the criterion for flow regime, experimental verification will be conducted by employing PDPA (Phase Doppler Particle Analyzer). Influence of working conditions on flow regime will be revealed, so that the flow regime can be regulated and controlled conveniently by changing working conditions, which will contribute to safe and stable operation of aero engine system. Implement of this project will improve the theory of gas-liquid two phase flow in the bearing chamber, and also provide theoretical and technological support for design and operation of aero engine.

英文关键词： gas-liquid flow;flow regime;numerical simulation;HHT;criterion