Thermohydrodynamic Study of Multiwound Foil Bearing Using Lobatto Point Quadrature
Thermohydrodynamic Study of Multiwound Foil Bearing Using Lobatto Point Quadrature
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DOI：
10.1115/1.3070579
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发表时间：
2009-04
期刊：
影响因子：
--
通讯作者：
K. Feng;S. Kaneko
中科院分区：
文献类型：
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作者：
K. Feng;S. Kaneko
箔式空气轴承的应用范围得到了扩展，广泛应用于高速、高温的涡轮机械中。润滑油温度成为影响箔式空气轴承性能的重要因素，特别是在高转速和高负荷或高环境温度下。本文对多绕箔轴承进行了热流体力学分析，将气体粘度作为温度的函数，由能量方程得到雷诺方程。利用Lobatto点正交加速迭代过程，使网格在膜厚上稀疏分布。利用有限元模型描述了箔片的弹性特性。在雷诺方程、箔片弹性挠度方程和能量方程之间进行迭代，直至收敛。提出了气膜的三维温度预测方法，并与等温结果进行了比较，强调了热效应的重要性。最后，用已发表的实验数据对数值解进行了验证。
The applications of foil air bearings have been extended for use in a wide range of turbomachineries with high speed and high temperature. Lubricant temperature becomes an important factor in the performance of foil air bearings, especially at high rotational speeds and high loads or at high ambient temperature. This study presents a thermohydrodynamic (THD) analysis of multiwound foil bearing, in which the Reynolds' equation is solved with gas viscosity as a function of temperature that is obtained from the energy equation. Lobatto point quadrature is utilized to accelerate the iteration process with a sparse mesh across film thickness. A finite element model of the foil is used to describe the foil elasticity. An iterative procedure is performed between the Reynolds equation, the foil elastic deflection equation, and the energy equation until convergence is achieved. A three-dimensional temperature prediction of air film is presented, and a comparison of THD to isothermal results is made to emphasize the importance of thermal effects. Finally, published experimental data are used to validate this numerical solution.