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Experimental study on bump-foil gas bearing with different diametric clearance configurations

机译:不同直径间隙配置的凹凸箔气体轴承的实验研究

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摘要

The stability characteristics of a 25 mm rotor turboexpander with bump-foil journal-gas-bearing pairs and a pair of pressurized thrust bearing are investigated in this study. The journal-gas-bearing pairs in various inner diameters supply radial support for the rotor with different hydrodynamic gas-film thicknesses, and the pair of pressurized thrust bearings balances the axial forces. The experimental results reveal that the stability of the bump foil gas bearing is achieved over a wide range of diametric clearances and that an optimal nominal diametric clearance exists, thus resulting in high rotation speed with small vibration amplitudes. The maximum turboexpander speed reached 93.3 krpm under the nominal diametric clearance of 0 mu m with a maximum synchronous amplitude of less than 20 mu m.
机译:本研究研究了带有凸箔-轴颈-气体轴承对和一对加压推力轴承的25mm转子涡轮膨胀机的稳定性。内径不同的轴颈气体轴承对以不同的流体动力气膜厚度为转子提供径向支撑,而加压推力轴承对则平衡了轴向力。实验结果表明,在宽的径向间隙范围内都可以达到凸点箔气体轴承的稳定性,并且存在最佳的额定径向间隙,因此可以实现较高的转速和较小的振动幅度。在名义直径间隙为0μm时,最大涡轮膨胀机转速达到93.3 krpm,最大同步幅度小于20μm。

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