螺旋折流板换热器论文：螺旋折流板换热器的性能研究及结构优化.doc

螺旋折流板换热器论文：螺旋折流板换热器的性能研究及结构优化【中文摘要】本文采用Fluent软件,对弓形折流板、连续型螺旋折流板、传统型1/4螺旋折流板以及新型1/4螺旋折流板换热器进行了数值模拟,系统地研究了不同换热器壳程的内部场、换热性能、阻力性能以及综合性能。采用弓形折流板换热器进行了网格无关性研究,确定了1.7mm的网格无关尺寸。针对1/4螺旋折流板换热器壳体中心和相邻折流板之间存在的漏流及壳程进出口压降过大的现象,提出了加宽折流板及倾斜壳程进出口管的改进措施。根据模拟结果,得出以下结论：1/4螺旋折流板换热器最佳螺旋角范围为25-36,连续型螺旋折流板换热器的综合性能最优,其值是传统型1/4螺旋折流板换热器的1.018-1.052倍,新型1/4螺旋折流板换热器的综合性能是传统型1/4螺旋折流板换热器的1.05倍左右,而弓形折流板换热器是传统型1/4螺旋折流板换热器的0.534-0.573倍。同时本文还给出了不同螺旋折流板换热器壳程的努赛尔数(Nu)及阻力系数(f)与雷诺数(Re)的关系式。最后,本文设计并制造了一台新型1/4螺旋折流板换热器进行实验研究,得到总换热系数和壳程压力降的实验值与模拟值的误差分别在-7.62%-2.35%之间以及15%左右,进一步验证了本文数值模拟结果的正确性。【英文摘要】A research of numerical simulation on heat exchanger with bow-shaped baffles, heat exchanger with continuous helical baffles, traditional heat exchanger with 1/4 helical baffles and new type heat exchanger with 1/4 helical baffles by using Fluent software has been done in this paper. This paper do a research on the internal flow field, heat transfer performance, resistant performance and comprehensive performance in the shell side systematically. With the mesh-independent of heat exchanger with bow-shaped baffles verified, the mesh size are defined as 1.7mm. For not only leakage problem in the center of shell side and between baffles, but also high pressure drop in the import and export of shell side of the heat exchanger with 1/4 helical baffles, some measures that widen the baffles and tilt the import and export of the shell tube have been proposed in this paper.According to the simulation results, it comes to following conclusions:the best helix angle of heat exchanger with helical baffles ranges from 25to 36. When it comes to the comprehensive performance, heat exchanger with continuous helical baffles is the best, the value is 1.0181.052 times better than traditional heat exchanger with 1/4 helical baffles, the comprehensive performance of new type heat exchanger with 1/4 helical baffles is about 1.05 times better than traditional heat exchanger with 1/4 helical baffles, but the value of heat exchanger with bow-shaped baffles is 0.5340.573 times than traditional heat exchanger with 1/4 helical baffles. Meanwhile, the relationships between Nusselt number(Nu) and resistant coefficient(f) with Reynolds number(Re) have been established in this paper. In the end, an experimental study was done on new type heat exchanger with 1/4 helical baffles after been designed and manufactured, then it comes to the conclusions that the heat transfer coefficient at both of the tube and the pressure drop on the shell side deviate-7.62%2.35% and about 15% between experimental values and simulation values, validating the correctness of the numerical simulation in this paper further.【关键词】螺旋折流板换热器 螺旋角 数值模拟 性能研究 结构优化【英文关键词】heat exchanger with helical baffles helix angle numerical simulation performance study structural optimization【备注】在线加好友索购全文 ：1-3-9-9.38-8-4-8 同时提供论文写作一对一指导和论文发表委托服务。本文由学术文献总库合作提供，无涉版权。作者如有异议请与总库或学校联系。【目录】螺旋折流板换热器的性能研究及结构优化摘要5-6Abstract6目录7-10第1章 绪论10-151.1 研究背景10-111.2 折流板布置对于换热性能的影响11-121.3 研究现状12-141.3.1 实验研究现状12-131.3.2 数值模拟研究现状13-141.4 本文主要内容14-15第2章 管壳式换热器的数值模拟方法15-272.1 计算软件的简介152.2 物理模型15-172.3 控制方程17-182.3.1 质量守恒定律172.3.2 动量守恒定律17-182.3.3 能量守恒定律182.4 网格的划分18-202.5 边界条件和计算的设置20-212.5.1 进出口的边界条件设置20-212.5.2 壁面条件设置212.5.3 求解器的设置212.6 特征参数的定义21-232.6.1 壳层的定性参数21-222.6.2 壳层对流换热系数22-232.6.3 壳层阻力系数232.7 换热器数值模拟方法的准确性23-262.7.1 网格无关性的验证23-242.7.2 换热器数值模拟准确性的验证24-262.8 本章小结26-27第3章 连续型螺旋折流板换热器的数值模拟研究27-393.1 引言273.2 连续型螺旋折流板换热器的内部场分析27-313.2.1 流动情况27-303.2.2 换热情况30-313.2.3 压力场分析313.3 螺旋角对连续型螺旋折流板换热器性能的影响31-343.3.1 螺旋角对换热性能的影响31-323.3.2 螺旋角对阻力性能的影响32-333.3.3 螺旋角对综合性能的影响33-343.4 壳程管嘴进出口形状对换热器性能的影响34-363.4.1 进出口形状对换热性能的影响34-353.4.2 进出口形状对阻力性能的影响353.4.3 进出口形状对综合性能的影响35-363.5 连续型螺旋折流板换热器的关联式回归36-383.5.1 换热系数关联式的回归36-373.5.2 阻力系数关联式的回归37-383.6 本章小结38-39第4章 1/4螺旋折流板换热器的数值模拟及结构优化研究39-544.1 引言394.2 1/4螺旋折流板换热器的壳程流动分析39-414.3 1/4螺旋折流板与弓形折流板、连续型螺旋折流板换热器的性能对比41-434.3.1 换热性能对比41-424.3.2 阻力性能对比42-434.3.3 综合性能对比434.4 1/4螺旋折流板换热器的结构优化方案43-444.5 新型1/4螺旋折流板换热器的壳程流动分析44-454.6 新型1/4螺旋折流板换热器与1/4螺旋折流板换热器的性能对比研究45-464.6.1 换热性能的对比454.6.2 阻力性能的对比45-464.6.3 综合性能的对比464.7 1/4螺旋折流板换热器和新型1/4螺旋折流板换热器的性能研究46-504.7.1 换热性能的研究46-484.7.2 阻力性能的研究48-494.7.3 综合性能的研究49-504.8 1/4螺旋折流板换热器和新型1/4螺旋折流板换热器的关系式回归50-524.8.1 换热系数关联式的回归50-514.8.2 阻力系数关联式的回归51-524.9 本章小结52-54第5章 新型1/4螺旋折流板换热器的实验研究54-645.1 新型1/4螺旋折流板换热器的设计与制造54-565.1.1 新型