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1、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°-3
2、6°,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
3、值模拟结果的正确性。【英文摘要】Aresearchofnumericalsimulationonheatexchangerwithbow-shapedbaffles,heatexchangerwithcontinuoushelicalbaffles,traditionalheatexchangerwith1/4helicalbafflesandnewtypeheatexchangerwith1/4helicalbafflesbyusingFluentsoftwarehasbeendoneinthispaper.Thispaperdoarese
4、archontheinternalflowfield,heattransferperformance,resistantperformanceandcomprehensiveperformanceintheshellsidesystematically.Withthemesh-independentofheatexchangerwithbow-shapedbafflesverified,themeshsizearedefinedas1.7mm.Fornotonlyleakageprobleminthecenterofshellsideandb
5、etweenbaffles,butalsohighpressuredropintheimportandexportofshellsideoftheheatexchangerwith1/4helicalbaffles,somemeasuresthatwidenthebafflesandtilttheimportandexportoftheshelltubehavebeenproposedinthispaper.Accordingtothesimulationresults,itcomestofollowingconclusions:thebes
6、thelixangleofheatexchangerwithhelicalbafflesrangesfrom25°to36°.Whenitcomestothecomprehensiveperformance,heatexchangerwithcontinuoushelicalbafflesisthebest,thevalueis1.018～1.052timesbetterthantraditionalheatexchangerwith1/4helicalbaffles,thecomprehensiveperformanceofnewtypeh
7、eatexchangerwith1/4helicalbafflesisabout1.05timesbetterthantraditionalheatexchangerwith1/4helicalbaffles,butthevalueofheatexchangerwithbow-shapedbafflesis0.534～0.573timesthantraditionalheatexchangerwith1/4helicalbaffles.Meanwhile,therelationshipsbetweenNusseltnumber(Nu)andr
8、esistantcoefficient(f)withReynoldsnumber(Re)havebeenestablishedinthispaper.Intheen
