Thermohydrodynamic analysis and thermal management of hybrid bump-metal mesh foil bearings: Experimental tests and theoretical predictions
Thermohydrodynamic analysis and thermal management of hybrid bump-metal mesh foil bearings: Experimental tests and theoretical predictions
复制标题
混合凸块金属网箔轴承的热流体动力学分析和热管理：实验测试和理论预测
DOI：
10.1016/j.ijthermalsci.2018.01.018
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发表时间：
2018
影响因子：
4.5
通讯作者：
Zhao Zilong
中科院分区：
文献类型：
--
作者：
Zhang Kai;Zhao Xueyuan;Feng Kai;Zhao Zilong
动静压金属网箔轴承是一种新型的气体箔条轴承，它由金属网片和金属网片组成。与传统的箔片轴承相比，HB-MFBs具有更多的优点，例如高结构减振、装配精度和在高温下工作的能力。建立了HB-MFBs的热力学模型，用来预测不同轴承载荷和转速下的轴承温度场。理论模型考虑了这种高性能箔片轴承中轴承子结构复杂的热边界，包括顶箔、碰撞箔和MMBs。建立了中空转子的详细传热模型，计算了通过转子壳体向周围环境传递的热能。为了避免轴承失效，考虑了空心转子的热生长和离心生长两种情况。为了验证所提出的热力学模型，搭建了一台试验台，用于测量轴承在静载荷和不同转速下的温度分布。为了降低轴承温度，采用了不同的中空转子冷却气流和轴承底座的热管理措施。研究了载荷系数对轴承峰值温度随转速的影响。比较了空心转子和轴承子结构的载热比。为了验证HB-MFBs的高温能力，分析了HB-MFBs中通过碰撞箔区域和MMB区域的热能。
Hybrid bump–metal mesh foil bearings (HB-MFBs) are novel gas foil bearings (GFBs) composed of foil strips and metal mesh blocks (MMBs) in bearing substructure. HB-MFBs provide more advantages than traditional foil bearings, such as high structural damping, assembly accuracy, and ability to work at high temperatures. A thermohydrodynamic model of HB-MFBs was proposed to predict the bearing temperature field with various bearing loads and rotational speeds. The theoretical model considered the complex thermal boundary of bearing substructure in this high-performance foil bearing, including the top foil, bump foil, and MMBs. A detailed thermal-transfer model of hollow rotor was introduced to calculate the heat energy transferring through the rotor shell to the surrounding ambient. Both thermal and centrifugal growth of hollow rotor were considered because of the thin-air film of GFBs to avoid bearing failure. A test rig used to measure the bearing temperature distribution with static load and various rotational speeds was built to validate the proposed thermohydrodynamic model. Different thermal managements with cooling air flow in hollow rotor and bearing substructure were applied to decrease the bearing temperature. The influence of load carry coefficients on bearing peak temperature was investigated with respect to rotational speed. A comparison of heat carry ratios between hollow rotor and bearing substructure was also conducted. The heat energy conducted through the bump foil region and MMB region was analyzed to validate the high-temperature capacity of HB-MFBs.