摘要
以螺旋翅片管式换热器为研究对象,选取烟气进出口压降表征换热器流动阻力的大小、努塞尔数(Nu)表征换热器对流换热的强弱,利用Fluent软件模拟分析不同烟气流速下翅片结构参数对换热器流动阻力和换热效果的影响,并引入性能因子综合评价翅片结构参数对换热器换热性能的影响。结果表明:烟气流速一定时,翅片高度增加、厚度加厚和间距缩短均会使换热器进出口压降和Nu增加,在增大换热器流动阻力的同时,换热效果得到增强;翅片结构参数和性能因子的变化规律与Nu相反,选取高度较低、厚度较薄、间距较稀疏的翅片参数时换热器的综合性能更好;此外,与结构参数不同,烟气流速加快时Nu和性能因子均增大,能提升翅片管换热器的综合换热性能。
Taking spiral fin-and-tube heat exchanger as the research object,the inlet and outlet pressure drop and Nusselt number(Nu)were selected to characterize the flow resistance of flue gas and strength of convective heat exchange.Fluent software was used to simulate and analyze the influence of fin structure parameters on the flow resistance and heat exchange effect of heat exchanger under different flue gas flow rates.The performance factors were introduced to evaluate the influence of fin structure parameters on heat exchange performance.The results show that the inlet and outlet pressure drop and Nu increase with the increasing of fin height,thickness and spacing when the flue gas flow rate is constant,and the heat transfer effect is enhanced with the increasing of flow resistance.The variation of fin structure parameters and performance factors is contrary to Nu,The comprehensive performance of heat exchanger is better when selecting the fin parameters with lower height,thinner thickness and sparse spacing.In addition,different from the structure parameters,both Nu and performance factor increase when the flue gas flow rate increases,which can improve the comprehensive heat-transfering performance of the fin-and-tube heat exchanger.
作者
张宇
刘文仲
刘小芳
ZHANG Yu;LIU Wenzhong;LIU Xiaofang(School of Energy and Environment,Anhui University of Technology,Maanshan 243002,China)
出处
《安徽工业大学学报（自然科学版）》
CAS
2024年第2期189-194,共6页
Journal of Anhui University of Technology（Natural Science）
基金
国家自然科学基金项目(52206226)。
关键词
螺旋翅片管
换热器
数值模拟
烟气流速
换热特性
spiral finned tube
heat exchanger
numerical simulation
flue gas flow rate
heat-transfering performance
作者简介
张宇(1999-),男,安徽六安人,硕士生,主要研究方向为锅炉余热回收应用;通信作者:刘小芳(1976-),男,福建三明人,教授,主要研究方向为系统节能及燃烧污染物排放与控制。
