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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Experimental Analysis of Angled Injection Aerostatic Hybrid Bearings
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Experimental Analysis of Angled Injection Aerostatic Hybrid Bearings

机译：角射空气静压混合轴承的实验分析

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摘要

Counter-rotation angled injection employed for aerostatic hybrid bearings reduces the cross coupling stiffness that may lead to whirl–whip instabilities at high rotation speeds. The benefits of counter-rotation injection have been known for years. Theoretical investigations were performed for water or air fed hybrid bearings but experiments were conducted only for water fed bearings. The present work is the first effort dedicated to angled injection in air fed hybrid bearings. The tests were performed for a simple rotor supported by two identical hybrid bearings. The hybrid bearings are provided with small size, shallow pockets and are fed with air via counter-rotation-oriented orifice type restrictors. An impulse turbine fed with air entrains the rotor. An impact gun applies dynamic excitations and the rotordynamic coefficients are identified from the equations of motion of the rotor. Different air feeding pressures are tested as well as high rotational speeds. Compared to the dynamic characteristics of radial injection hybrid bearings, the direct stiffness of counter-rotation injection bearings has slightly lower values and the direct damping is higher but the main impact is the drastic reduction of the cross-coupling stiffness that may have even negative values.
机译：空气静压混合轴承采用的反向旋转角喷射降低了交叉联轴器的刚度，这可能会导致在高转速下产生旋扭稳定性。反向旋转注射的好处已为人所知多年。对水或空气馈送混合轴承进行了理论研究，但仅对水馈送轴承进行了实验。当前的工作是致力于在空气混合轴承中进行角喷射的首次尝试。对由两个相同的混合轴承支撑的简单转子进行了测试。混合轴承具有小尺寸，浅凹窝，并通过导向反向旋转的节流孔型节流阀供气。充满空气的脉冲涡轮带动转子。冲击枪施加动态激励，并根据转子的运动方程确定转子动力学系数。测试了不同的进气压力以及高转速。与径向注射混合轴承的动态特性相比，反向旋转注射轴承的直接刚度值略低，直接阻尼较高，但主要影响是交叉耦合刚度的急剧降低，甚至可能具有负值。 。

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