液压系统内过渡流数值预测中的计算机应用

在机械和实验装置中,广泛使用着以直管道连接液压泵和换向阀的液压系统。根据该系统中油液过渡流的动态特性数值预测的实际需要,将二维微压缩性粘流数学模型进行二次模型化处理,对层流过渡流提出了简便的数值预测方法,开发了计算机应用软件。用计算机对实验装置和铲运机液压系统产生的液压冲击进行数值计算,并通过实验验证和动态特性仿真分析,证实了本数值预测方法及其应用软件的有效性,揭示了油液过渡流的瞬态变化规律,为液压装置提供了新的测试手段。最后对这一研究成果的预期效益和应用前景作了分析与评价。

AN APPLICATION OF COMPUTER IN THE NUMERICAL PREDUCTION OF TRANSITION FLOW IN HYDRAULIC SYSTEM

Hydraulic systems with straight pipeline connecting a hydraulic pump to change-over valves are used widely in laboratory devices and apparatus. Since there is a need for numerical prediction of the dynamic characteristics of transition flow, secondary modelling of the mathematical model for two-dimensional and slightly compressible viscous flow results in a more simple numerical prediction method for laminar transition flow and a computer software is developed. Hydraulic shocks generated in hydraulic systems of laboratory devices and LHD are calculated with computer. Experiment verification and simulation analysis of dynamic characteristics proved the effectiveness of the numerical prediction method and the relevant software, and revealed the transient change law of oil transition flow so that a new inspection method for hydraulic systems is provided. Finally, the expected profits and application prospect of this study evaluated.