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Numerical investigation of the influence of the inlet nozzle diameter on the degree of fluid exchange process in a hydraulic cylinder
Engineering Applications of Computational Fluid Mechanics ( IF 6.1 ) Pub Date : 2021-08-19 , DOI: 10.1080/19942060.2021.1958379
Tomasz Siwulski 1 , Urszula Warzyńska 1
Affiliation  

Operation of heavy-duty machines leads to an observation that seals in hydraulic cylinders are frequently subjected to thermal degradation. The basis of this research is the previously proven thesis that the temperature of the liquid in the cylinder and the cylinder itself may significantly differ from the temperature of the liquid in the system and in the tank, thus enabling the temperature in the cylinders to rise above the operating temperature of the seals. This effect is a result of limited possibility of fluid exchange in the cylinder during operation. This paper presents simulation results of the liquid mixing phenomenon in the chamber of a hydraulic cylinder with a modified hydraulic power supply system. The article focuses on determining the influence of the diameter of the supply nozzle, and thus the change of the potential energy of the stream supplying the cylinder chamber, on the liquid exchange process, which was defined by the thermal balance of the system. The proposed method allows designing of hydraulic cylinders in order to maintain constant temperature conditions in each part of a cylinder and thus eliminate thermal degradation of sealing. The research was based on an experimentally verified CFD model of the cylinder chamber.



中文翻译:

进口喷嘴直径对液压缸流体交换过程程度影响的数值研究

重型机器的操作导致观察到液压缸中的密封件经常受到热降解。这项研究的基础是先前证明的论点,即钢瓶内液体的温度和钢瓶本身的温度可能与系统和罐内液体的温度存在显着差异,从而使钢瓶内的温度升高到高于密封件的工作温度。这种效果是操作期间气缸中流体交换的可能性有限的结果。本文介绍了改进液压动力供应系统的液压缸腔内液体混合现象的模拟结果。文章重点确定供料喷嘴直径的影响,因此,在液体交换过程中,供应气缸室的流体势能的变化,这是由系统的热平衡定义的。所提出的方法允许设计液压缸,以便在液压缸的每个部分保持恒定的温度条件,从而消除密封的热降解。该研究基于经过实验验证的气缸室 CFD 模型。

更新日期:2021-08-19
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