The Oil/Air Two Phase Flow Pattern Recognition in Bearing Chamber of Aircraft Engine Based on Clustering Analysis
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摘要: 轴承腔是航空发动机内的重要部件,对其内两相流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。基于流型辨识研究两相流在不同流型下的流动性质是获取轴承腔内物理现象的一个可行途径。在考虑试验获取难易性和辨识能力条件下,结合前人研究成果,应用K-Means聚类法对利于辨识轴承腔3种典型两相流流型的特征参数-无量纲两相介质速度和无量纲压力在近壁面附近的数值进行聚类分析。研究结果表明:该方法能够成功地将轴承腔3种典型流型进行归类,这对基于流型辨识研究轴承腔内3种典型流型下两相介质的物理状态,以及轴承腔润滑设计和换热分析提供了基础。Abstract: The bearing chamber is an important component in aircraft engine. To understand the oil/air two phaseflow conditions in the bearing chamber is beneficial to improve the lubrication efficiency,working performance andreliability of an aircraft engine. The two phase flow conditions of the different flow patterns can be studied based onthe flow pattern recognition,which is a feasible way to obtain the physical phenomenon of two phase flows in thebearing chamber. Considering the experiment accessibility,recognition ability and the predecessors' works,the K-Means clustering analysis was employed to cluster the oil/air two phase flow pattern in the bearing chamber with thecharacteristic parameters on the wall surface nearby. The dimensionless two phase mixture velocity and the dimen-sionless pressure were chosen as the characteristic parameters for their remarkable difference in the flow pattern.The results of work indicate that the clustering approach is a successful one to identify the flow pattern in the bear-ing chamber. The work supports the physical conditions research, the lubrication design and the heat transfer analy-sis in the bearing chamber based on the flow pattern recognition.
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Key words:
- aircraft /
- engine /
- bearing chamber /
- oil/air two phase /
- flow pattern recognition /
- characteristicparameter
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[1] Witting S，Glahn A，Himmelsbach J. Influence of high rotationalspeeds on heat transfer and oil film thickness in aero-engine bear-ing chambers[J]. Transactions of the ASME，Journal of En-gineering for Gas and Turbines and Power，1994，116(2):395～401 [2] Glahn A，Wittig S. Two-phase air/oil flow in aero engine bearingchambers: characterization of oil film flows[J]. Transactions ofthe ASME，Journal of Engineering for Gas Turbines andPower，1996，118(7):578～583 [3] Gorse P，Busam S，Dullenkopt K. Influence of operating condi-tion and geometry on the oil film thickness in aeroengine bearingchambers[J]. Transactions of the ASME，Journal of Engi-neering for Gas Turbines and Power，2006，128 (1):103～110 [4] Farrall M，Hibberd S，Giddings D. Prediction of air/oil exitflows in a commercial aero-engine bearing chamber[J]. Pro-ceeding of Mechanical Engineers，Part G: Journal Aero-space Engineering，2006，220(3):197～202 [5] Farrall M，Hibberd S，Simmons K. The effect of initial injectionconditions on the oil droplet motion in a simplified bearing cham-ber[J]. Transactions of the ASME，Journal of Engineeringfor Gas Turbines and Power，2008，130(1):1～7 [6] Farral M，Simmons K，Hibberd S. A numerical model for oil filmflow in an aeroengine bearing chamber and comparison experi-mental data[J]. Transactions of the ASME，Journal of Engi-neering for Gas Turbines and Power，2006，128 (1):111～117 [7] 刘曼利. 航空发动机轴承腔油气两相流型判断及分析[D]．西安:西北工业大学，2011 [8] Wu H T，Chen G D. The calculation of two-phase gas/liquid ho-mogenous flow in bearing chambers[J]. Advances in MaterialsManufacturing Science and Technology Ⅱ，2006，532～533:717～720 [9] 吴昊天，陈国定. 轴承腔油气两相泡状流动的数值研究[J]．机械工程学报，2008，44(9):70～75 [10] 张凤娟，陈国定，吴昊天. 基于遗传算法/神经网络组合技术的气液两相流型辨识[J]. 机械科学与技术，2005，24(6):670～672 [11] 陈国定，刘曼利，刘亚军等. 不同流型下轴承腔中油气介质的流动特征参数[J]. 航空学报，2010，31(12):2400～2406 [12] 林震岩. 多变量分析-SPSS 的操作与应用[M]. 北京:北京大学出版社，2007 [13] 刘大海，李宁，晁阳. SPSS15. 0 统计分析从入门到精通[M]．北京:清华大学出版社，2008 [14] 方开泰，潘恩沛. 聚类分析[M]. 北京:地质出版社，1982 -
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