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首页> 外文期刊>Meccanica: Journal of the Italian Association of Theoretical and Applied Mechanics >Modeling of radial piston machines considering elastohydrodynamic effects in both cam-piston and piston-cylinder lubricating interfaces
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Modeling of radial piston machines considering elastohydrodynamic effects in both cam-piston and piston-cylinder lubricating interfaces

机译：考虑凸轮活塞和活塞 - 缸润滑界面弹性流体动力学辐射活塞机的建模

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摘要

This study illustrates a novel numerical approach for investigating the complex physics involved in radial piston pump (rotating cam type) operation. This approach is based on a fully-coupled model that combines the evaluation of the main flow through the unit, realized by the pistons' displacement, with the simulation of the internal lubricating interfaces, given by the piston-cylinder interface and the cam-piston interface. These interfaces represent the main source of power dissipation due to leakages and shear. The comprehensive multi-domain simulation tool presented in this paper incorporates a robust fluid-structure interaction based numerical model for the piston-cylinder lubricating interface as well as a model for the lubricant flow in the cam-piston interface. Since the approach used for piston-cylinder interface was previously presented by the authors, in this work particular emphasis is given to the description of the elastohydrodynamic lubrication model for the cam-piston interface. The overall coupling between these models enables an accurate estimation of the piston micro-motion that is critical to analyzing fluid flow in the lubricating gaps during pump operation. Results are shown with reference to a pump with four pistons designed to reach pressures up to 2500 bar. For this unit, the outer race of the cam-which is in contact with multiple pistons during pump operation-is unconstrained in its rotation, and it undergoes a complex motion due to which experimental measurements of its angular velocity were performed. The results from the study confirm the utility of the numerical model as an effective tool for modeling radial piston machines.
机译：该研究说明了一种用于研究径向活塞泵（旋转凸轮型）操作中涉及的复杂物理的新型数值方法。该方法基于一个完全耦合的模型，该模型将主流的评估与通过活塞 - 缸接口和凸轮活塞给出的内部润滑界面的模拟来结合通过活塞的位移。界面。这些界面代表由于泄漏和剪切引起的功耗的主要来源。本文呈现的综合多域仿真工具包括用于活塞缸润滑界面的鲁棒流体结构基于数值模型，以及凸轮活塞接口中的润滑剂流量的模型。由于作者先前呈现了用于活塞缸界面的方法，因此在这种工作中，特别强调凸轮活塞界面的弹性流体润滑模型的描述。这些模型之间的整体耦合可以精确地估计活塞微观运动，这对于在泵操作期间分析润滑间隙中的流体流动是至关重要的。结果参考了一个带有四个活塞的泵，可达到2500巴的压力。对于该单元，在泵操作期间凸轮的外座圈与多个活塞接触 - 在其旋转中不受约束，并且由于其角速度的实验测量，它经历了复杂的运动。研究结果证实了数值模型的效用作为径向活塞机建模的有效工具。

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