含阻系统分析方法及其在先导式截止阀阀芯小孔设计中的应用

Obstacle contained system(OCS)design method and its application in valve core orifice design of pilot-control globe valve

随着社会和时代的进步,复杂物理系统日益常见,传统的工程分析与设计方法面临着巨大挑战,因此,针对复杂物理系统的诸多参数,研究新的分析方法、提炼海量数据、指导工程分析与设计,显得尤为迫切。从系统分析方法角度,对弹簧滑块系统、直流电路系统、流场压降系统和平板传热热阻系统进行了阐述;对4种物理系统中的重要物理量进行了分析与归纳,提出了含阻系统的设想,其由阻元、过体和势头三个部分组成;在已经具有海量数据的基础上,含阻系统分析方法可通过确立物理系统中的阻元、过体和势头,建立阻元对势头的直接联系,简化物理问题,得到相对准确的结果。同时,采用含阻系统分析方法对先导式截止阀的阀芯设计进行了研究,结果表明,数值模拟和含阻系统分析方法得出的阀芯小孔处的压差和最大汽含率均在2%的误差范围内,这说明含阻系统分析方法可用于指导先导式截止阀阀芯小孔的设计。在海量数据积累的大数据时代,含阻系统分析方法可针对各种类型的复杂物理模型进行工程分析与设计,具有广阔的应用前景。

With the development of the society and the times,traditional parametric design methods are witnessing a severe challenge due to the more and more complex physical systems.Thus,developing novel parametric analysis methods is very important for dealing with complex physical systems,refining useful parameters from numerous data,and proposing accurate prediction formulas.A spring slider system,a direct-current circuit system,apipeline pressure drop system and a steady heat transfer model of flat plate system were described from the point of systemic parametric analysis method.Then,the key physical parameters in above four systems were summarized.Based on the comparative results,a novel systemic parametric design method,obstacle contained system（OCS）design method,was proposed.The OCS was made up of three elements：an obstacle element,apass body element and a D-value element.With an abundant accurate data pole,the OCS design method could build the direct relationship of the obstacle element and the D-value element,which meant the simplification of the physical models and mucheasier to get relatively accurate results.Meanwhile,the design of pilot-control globe valve orifice was checked with both the OCS design method and the numerical simulation.The diameter of orifice on the valve core could influence the pressure difference and the maximum vapor rate inside pilot-control globe valves.Achieved by two different methods,the OCS design method and the numerical simulation,the results showed that the effects of orifice diameters on the pressure difference and the maximum vapor rate under different inlet velocities,were within 2% errors,which was reasonable and acceptable for the engineering application.In other words,the OCS design method was credible for parametric analysis.In future,the OCS design method has a broad application prospect to analyze various types of physical models especially in the era of big data.