PE阀门气密性检测过程压力温度仿真研究  

Simulation Research on Pressure and Temperature During Tightness Detection of PE Valves

作　　者：潜龙杰 杨其华[1] 刘钢海[1] 林小平 

机构地区：[1]中国计量学院,杭州310018 [2]杭州戴雷科技有限公司,杭州310018

出　　处：《科技通报》2016年第10期139-143,共5页Bulletin of Science and Technology

摘　　要：针对PE阀门气密性检测过程中阀门腔内气体压力变化复杂,以及采用平均对流传热系数建模不符合实际需求的问题,提出了基于对流传热系数热力学推导的传热模型及压力温度仿真方法。以努塞尔数公式和Morgan关联式为基础推导得出阀门壁面的对流传热系数,建立基于内外壁对流传热和阀体温度变化的传热模型,结合气体质量及压力模型,使用Simulink实时动态仿真。分析了充气过程中压力温度的变化,获得了不同容积阀门的充气平衡时间,得出了检测过程中阀门腔内压力受阀体和环境温度的影响规律,为实际检测提供参考依据。Since the variation of pressure in the cavity during the tightness detection of PE valves is complicated and the heat transfer model using the average convective heat transfer coefficient is unpractical, a heat transfer model based on thermodynamic derivation and simulation method of pressure and temperature were proposed. The wall'convective heat transfer coefficient was obtained according to Nusselt number formulas and Morgan correlation, a heat transfer model based on convective heat transferring of internal and external walls and valves' body temperature changes was established, the gas quality and pressure model in valve's cavity were combined with heat transfer model and real- time dynamic simulation was advanced by using Simulink. Trend of pressure and temperature in the aeration process was analyzed, the aeration equilibration times of different volume valves were obtained, pressure change regular pattern under the influence of valves' body and ambient temperature was gotten in the detection process. The result provide a reference for the actual detection.

关 键 词：气密性检测 传热模型 温度影响 平衡时间 SIMULINK仿真 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]