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首页> 外文期刊>Journal of Tribology >Thermohydrodynamic Model Predictions and Performance Measurements of Bump-Type Foil Bearing for Oil-Free Turboshaft Engines in Rotorcraft Propulsion Systems
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Thermohydrodynamic Model Predictions and Performance Measurements of Bump-Type Foil Bearing for Oil-Free Turboshaft Engines in Rotorcraft Propulsion Systems

机译：旋翼飞机推进系统中无油涡轮轴发动机凸面型油膜轴承的热流体动力学模型预测和性能测量

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摘要

An engineered thermal management is fundamental to the application of gas foil bearings (GFBs) as turboshaft supports in rotorcraft propulsion systems. The paper presents a model for the thermal energy transport in a rotor-GFB system operating at high temperature with typical inner and/or outer cooling flows. Predicted film temperatures agree with published test data, demonstrating the effectiveness of an outer cooling stream to remove heat and to control the operating temperature. The inner flow stream is not as efficient. The analysis shows paths of thermal energy by conduction and convection to assist in the design and troubleshooting of rotor-GFB systems operating hot. Bearing temperatures and shaft motions measurements are obtained in a test rotor electrically heated to 132℃. In speed-up tests to 26 krpm, the rotor motion amplitude drops suddenly just above the critical speed, thus, evidencing the typical hardening of compliant bearings. At the hottest test condition, since air is more viscous, the rotor peak motion amplitude decreases, not showing a jump. The coastdown tests show the critical speed increases slightly as the temperature increases.
机译：工程化的热管理是气箔轴承（GFB）作为旋翼飞机推进系统中的涡轮轴支撑件应用的基础。本文提出了一种在高温下运行的转子-GFB系统中具有典型内部和/或外部冷却流的热能传输模型。预测的薄膜温度与已发布的测试数据一致，证明了外部冷却流去除热量和控制工作温度的有效性。内部流不是那么有效。该分析显示了通过传导和对流产生的热能路径，有助于热运行的转子-GFB系统的设计和故障排除。在电加热到132℃的测试转子中获得轴承温度和轴运动的测量值。在加速测试中，当转速达到26 krpm时，转子的运动幅度突然突然下降到临界速度之上，从而证明了柔顺轴承的典型硬化。在最热的测试条件下，由于空气更粘稠，转子的峰值运动幅度减小，没有出现跳跃。滑行试验表明，临界速度随温度的升高而略有增加。

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