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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Bump-Type Foil Bearings and Flexure Pivot Tilting Pad Bearings for Oil-Free Automotive Turbochargers: Highlights in Rotordynamic Performance
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Bump-Type Foil Bearings and Flexure Pivot Tilting Pad Bearings for Oil-Free Automotive Turbochargers: Highlights in Rotordynamic Performance

机译：无油汽车涡轮增压器的凸点型箔轴承和挠性枢轴倾斜垫轴承：转子动力性能的亮点

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摘要

Oil-free turbochargers (TCs) require gas bearings in compact units of enhanced rotordynamic stability, mechanical efficiency, and improved reliability with reduced maintenance costs compared with oil-lubricated bearings. Implementation of gas bearings into automotive TCs requires careful thermal management with accurate measurements verifying model predictions. Gas foil bearings (GFBs) are customarily used in oil-free micro-turbomachinery because of their distinct advantages including tolerance to shaft misalignment and centrifugal/thermal growth, and large damping and load capacity compared with rigid surface gas bearings. Flexure pivot tilting pad bearings (FPTPBs) are widely used in high-performance turbomachinery since they offer little or no cross-coupled stiffnesses with enhanced rotordynamic stability. The paper details the rotordynamic performance and temperature characteristics of two prototype oil-free TCs; one supported on foil journal and thrust bearings and the other one is supported on FPTP journal bearings and foil thrust bearings of identical sizes (outer diameter (OD) and inner diameter (ID)) with the same aerodynamic components. The tests of the oil-free TCs, each consisting of a hollow rotor (～0.4kg and ～23mm in OD at the bearing locations), are performed for various imbalances in noise, vibration, and harshness (NVH; i.e., cold air driven rotordynamics rig) and gas stand test facilities up to 130 krpm. No forced cooling air flow streams are supplied to the test bearings and rotor. The measurements demonstrate the stable performance of the rotor-gas bearing systems in an ambient NVH test cell with cold forced air into the turbine inlet. Post-test inspection of the test FPTPGBs after the hot gas stand tests evidences seizure of the hottest bearing, thereby revealing a notable reduction in bearing clearance as the rotor temperature increases. The compliant FPTPGBs offer a sound solution for stable rotor support only at an ambient temperature condition while demonstrating less tolerance for shaft growth, centrifugal, and thermal, beyond its clearance. The current measurements give confidence in the present GFB technology for ready application into automotive TCs for passenger car and commercial vehicle applications with increased reliability.
机译：与油润滑轴承相比，无油涡轮增压器（TC）要求气体轴承采用紧凑型单元，以提高转子的动态稳定性，机械效率和可靠性，并降低维护成本。将气体轴承安装到汽车TC中需要仔细的热管理和准确的测量，以验证模型预测。气体箔片轴承（GFB）通常用于无油微型涡轮机械，因为与刚性表面气体轴承相比，气体箔片轴承具有明显的优势，包括对轴未对准和离心/热增长的耐受性以及较大的阻尼和负载能力。挠性枢轴可倾瓦轴承（FPTPB）被广泛用于高性能涡轮机械，因为它们几乎不提供交叉耦合刚度，甚至没有交叉耦合刚度，并且转子动力稳定性更高。本文详细介绍了两个原型无油TC的转子动力学性能和温度特性。一个支撑在箔片轴颈和推力轴承上，另一个支撑在FPTP轴颈轴承和相同尺寸（外径（OD）和内径（ID））且具有相同空气动力学部件的箔片推力轴承上。对无油TC进行了测试，每个TC由一个空心转子（轴承位置处的外径为〜0.4kg和〜23mm）组成，以应对各种噪声，振动和粗糙度（NVH；即冷空气驱动）的不平衡情况。转子动力学装置）和高达130 krpm的气密试验设备。没有强制冷却气流流向测试轴承和转子。这些测量证明了在环境NVH测试室中转子气体轴承系统的性能稳定，冷空气进入涡轮机进气口。在经过热气站测试后，对测试FPTPGB的测试后检查表明卡住了最热的轴承，从而发现随着转子温度的升高，轴承游隙显着减小。兼容的FPTPGB仅在环境温度条件下为稳定的转子支撑提供了可靠的解决方案，同时还证明了其对轴增长，离心力和热力的公差小于其间隙。当前的测量结果为目前的GFB技术提供了信心，该技术可立即应用于可靠性更高的乘用车和商用车应用的汽车TC。

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  • 来源
    《Journal of Engineering for Gas Turbines and Power》 |2016年第4期|042501.1-042501.10|共10页
  • 作者

    Keun Ryu; Zachary Ashton;

  • 作者单位

    Department of Mechanical Engineering, Hanyang University, Ansan, Gyeonggi-do 15588, South Korea;

    Global Engineering Core Science, BorgWarner Turbo Systems, Arden, NC 28704;

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  • 正文语种 eng
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