Turbulent flushing of internal pipe-type surfaces in hydraulic components

The cleanliness of hydraulic systems has long been regarded as a crucial indicator of their performance and longevity. This study aims to elevate the cleanliness level of hydraulic components from 500 μm to 300 μm. To achieve this goal, this study integrates the flushing process and establishes a physical and mathematical model of wired solid pollutants on internal pipe-type surfaces during flushing based on Reynolds equation. This paper proposes the introduction of a cleanliness coefficient as a quantitative measure for evaluating cleanliness. The cleanliness coefficient serves as a threshold to determine whether particles can be effectively removed or not. The results of the orthogonal experiment demonstrate that the error between theoretical models and actual outcomes is merely 7.4%, affirming the effectiveness of the physical and mathematical models. The cleanliness coefficient provides guidance for setting flushing process parameters. The innovation of this study lies in the introduction of the cleanliness coefficient concept, which offers a more quantitative approach compared to traditional qualitative assessment methods.