排灌机械工程学报2025，Vol.43Issue(3)：268-274,7.DOI:10.3969/j.issn.1674-8530.23.0273
变孔径比多孔板对管道内流动特性的影响分析
Analysis of influence of variable aperture-ratio perforated plates on flow characteristics in pipelines
摘要
Abstract
The evaluation of hydrodynamic characteristics of fluids in the pipelines using porous plate with variable aperture ratio was investigated.A computational fluid dynamics numerical model was built and the reliability of the computational results was validated.Based on numerical simulation,the velo-city and pressure distribution characteristics of the fluids along the pipeline were studied.Besides,the changing law of pressure loss and the flow state around the porous plate with variable aperture ratio was studied.The numerical results show that the sensitivity of diffusion hole to outflow coefficient and pres-sure loss coefficient is slightly greater than that of shrinkage hole with various aperture ratios.The change of the aperture ratio makes the difference between the inlet and outlet diameters proportional to the pressure loss coefficient and inversely proportional to the outflow coefficient.The position of the in-flection point of flow rate and pressure peak is related to the aperture ratio.Furthermore,double-layer plates were introduced for further study.The results show that double-layer plate decreases the outflow coefficient and increases the pressure loss coefficient.The double-layer plate with aperture ratio of 1∶4 and 4∶1 are more sensitive to the outflow and pressure loss coefficient.The influence distance of flow rate is about 2 times pipe diameter,and the influence distance of pressure is about 1 times pipe diame-ter.The rear panel with various aperture ratios has no significant effect on the velocity variation caused by the front panel.关键词
多孔板/孔径比/压损系数/流出系数/流动Key words
perforated plate/aperture ratio/pressure loss coefficient/discharge coefficient/fluid flow分类
力学引用本文复制引用
金恒,朱根生,李凤甡,李澍,陈星泽,张延瑞..变孔径比多孔板对管道内流动特性的影响分析[J].排灌机械工程学报,2025,43(3):268-274,7.基金项目
宁波市科技局公益类重点项目(2021S094) （2021S094）
宁波市科技局重大技术专项(2022Z061,2022Z165) （2022Z061,2022Z165）
国家自然科学基金资助项目(52001276) （52001276）
