大管径Y型过滤器流动阻力特性数值模拟及实验研究

Numerical Simulation and Experimental Study on Flow Resistance Characteristics of Large-Diameter Y-Type Strainers

大管径Y型过滤器是区域供冷和供热领域常用的过滤装置,设计师在选型时往往仅关注滤网目数,而忽略对过滤器阻力损失的关注.为了探究大管径Y型过滤器阻力损失的影响因素,首先,采用数值仿真计算的方法,分别建立不同特征尺寸的三维Y型过滤器模型,并利用深圳市前海区域供冷系统中的过滤器实验平台验证模拟的准确性;其次,研究了不同特征尺寸对于改善大管径Y型过滤器阻力损失的影响情况,并针对特征尺寸进行灰关联度排序,结果表明,影响程度由大到小依次为:腔体出口尺寸>滤网透过率>腔体入口尺寸>腔体与管道轴线夹角>腔体中心筒径>腔体长度;最后,根据灰关联度排序,通过将过滤腔体筒径扩大至管道直径的1.25倍,将过滤腔体的长度延长至管道直径的1.20倍,将腔体出口尺寸扩大至管道直径的1.125倍,将腔体与管道轴线夹角扩大至55°,滤网透过率提高至43.83%,新设计了流动阻力特性更优的大管径Y型过滤器,CFD计算结果显示,新设计的过滤器与原过滤器相比,阻力损失下降了73.23%,可大幅降低流体输配能耗.针对CFD优化设计方法,利用尺寸相近的Y型过滤器开展了阻力特性对比实验验证.本研究为大管径Y型过滤器的优化设计及技术改造提供了理论依据.

Large-diameter Y-type strainers are frequently used in regional cooling and heating.When selecting a Ytype strainer,designers frequently focus solely on the mesh size of the strainer,ignoring the concern about the strainer’s resistance loss.To investigate the factors influencing the resistance loss of large-diameter Y-type strainers,three-dimensional Y-type strainer models with different characteristic sizes were first established using a numerical simulation method,and the accuracy of the simulation was verified using Y-type strainer experimental platform data from the cooling system in Shenzhen Qianhai.Second,the effect of different feature sizes on the improvement of resistance loss of a large-diameter Y-type strainer was investigated,and grey relation degree ranking was performed based on feature sizes.The results indicate that the influence degree decreased in the following order:cavity outlet size>strainer penetration rate>cavity inlet size>the angle between cavity and pipe axis>cavity center barrel diameter>cavity length.Finally,according to the grey relation degree ranking,increasing the cavity center barrel diameter to 1.25 times the pipeline diameter,extending the cavity length to 1.20 times the pipeline diameter,increasing the cavity outlet size to 1.125 times the diameter of the pipeline,increasing the angle between the cavity and the pipe axis to 55°,and increasing the strainer penetration rate to 43.83%,the large-diameter Y-type strainer with improved flow resistance characteristics was developed.The CFD calculation results reveal that when compared to the original Y-type strainer,the resistance loss of the newly designed Y-type strainer is reduced by 73.23%,which can substantially reduce the energy consumption of fluid transmission and distribution.According to the CFD optimization design method,the resistance characteristics of the Y-type strainer with a similar size were validated using comparative experiments.This research provides a theoretical foundation for optimizing the design and technical transformation of a large-diameter Y-type strainer.