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首页> 外文期刊>International journal of design engineering >Effects of turbulence on dynamic performance of accelerated/decelerated hydrodynamic journal bearing system
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Effects of turbulence on dynamic performance of accelerated/decelerated hydrodynamic journal bearing system

机译：湍流对加/减速液动轴颈轴承系统动力性能的影响

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摘要

The hydrodynamic journal bearing system has found the wide spread application in high speed rotating machines such as compressors, gas turbines, steam turbines, etc. The rotors generally operate at high speed; therefore the lubricant flow in the clearance space of journal bearing does not remain laminar for accelerated/decelerated journals. Then, study of the dynamic response of the hydrodynamic journal bearing system considering superlaminar flow is needed. In this paper, the analysis is done for the fluid-low-field in the clearance space of hydrodynamic journal bearing system using short bearing assumption under laminar, transition and turbulent flow conditions. The positive pressure zone is established after deleting sub-ambient pressure around clearance space. Linear and non-linear motion trajectories at constant speed are obtained using the fourth order Runge-Kutta method. The non-linear motion trajectories during acceleration and deceleration are also obtained. Journal centre trajectories at constant speed and laminar flow, show the expected trend, i.e., system is stable below threshold speed curve, unstable above it, whereas for superlaminar flow, stable behaviour is found at some distance away from the stability curve. The behaviour during stopping/starting of journal centre trajectories is also obtained by non-linear equations of motion. The results also show the expected trend.
机译：流体动力轴颈轴承系统已在诸如压缩机，燃气轮机，蒸汽轮机等高速旋转机器中得到了广泛的应用。因此，对于加速/减速轴颈，在轴颈轴承的游隙空间中的润滑剂流不会保持层流。然后，需要研究考虑超层流的流体动力轴颈轴承系统的动力响应。本文以层流，过渡和湍流条件下的短轴承假设为基础，对流体动力轴颈轴承系统间隙中的低流体场进行了分析。删除间隙周围的环境压力后，便建立了正压力区。使用四阶Runge-Kutta方法获得恒速的线性和非线性运动轨迹。还获得了加速和减速期间的非线性运动轨迹。在恒定速度和层流的情况下，轴颈中心轨迹显示了预期的趋势，即系统在阈值速度曲线以下是稳定的，在阈值速度曲线之上是不稳定的，而对于超层流，在离稳定性曲线一定距离处可以找到稳定的行为。轴心轨迹的停止/开始过程中的行为也可以通过非线性运动方程获得。结果也显示了预期的趋势。

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