液压系统乳化时管路边界层与系统参数的关系

为了在船舶液压系统发生乳化故障时诊断系统状况,研究液压系统管路边界层与其系统参数的关系。以锚机液压泵出口管路为研究对象,设计4种不同乳化污染程度的液压管路流动方案,运用Fluent对模型内部的流场进行模拟分析,并利用CFD(computational fluid dynamics)后处理软件对流动模型的数据进行提取,根据第二相体积分数云图来提取的管道内水团处的数据,比较管路边界层与液压系统状态参数之间的关系。研究表明：管道近壁面区域的速度梯度的突变值的最大值与含水量呈正比关系；在同一位置上,管道边界层的压力梯度绝对值的最大值与液压系统的乳化污染程度参数呈正比关系。通过对液压系统的乳化故障进行定性分析,将为液压系统状态监测和故障分析提供依据。

Pipeline Boundary Layer in Emulsification Failure ofMarine Hydraulic System Study on the Relation with

In order to study the relationship between the boundary layer of pipeline and the parameters of the corresponding hydraulic system when the emulsification fault occurs in the marine hydraulic system. Taking the outlet pipeline of hydraulic pump of anchor machine as the research object, four kinds of hydraulic pipeline flow schemes with different emulsification pollution degree were designed. The flow field inside the model is simulated and analyzed by Fluent, and the data of the flow model is extracted by CFD (computational fluid dynamics) post-processing software. According to the second phase volume fraction cloud, the data of the water mass in the pipeline are extracted, and the relationship between the boundary layer of the pipeline and the state parameters of the hydraulic system is compared. The results show that the maximum abrupt value of velocity gradient near the wall of pipeline is proportional to the water content. The maximum absolute pressure gradient of pipeline boundary layer is proportional to the parameters of emulsification pollution degree of hydraulic system. The emulsification fault of hydraulic system can be qualitatively analyzed, which can provide basis for monitoring and inspecting the state of hydraulic pipeline and analyzing the fault location.