风冷冷凝器管外流动与换热的数值模拟.pdfVIP

风冷冷凝器管外流动与换热的数值模拟 风冷冷凝器管外流动与换热的数值模拟 刘金平刘春花 (华南理工大学电力学院广fit510640) 摘要将数值模拟与实验相结合，对34O的v型冷凝器进行了模拟方法正确性的验证。在验证模拟方法正确的 基础上，又对不同夹角的v型冷凝器以及不同结构型式的冷凝器的管外三维流动与换热进行了数值研究，模拟采 用商用软件PHOENICS3．6进行。由于风冷冷凝器的主要热阻在空气侧，空气侧的换热性能决定了整个冷凝器的性 能，所以比较了不同夹角、不同结构下冷凝器空气侧的迎面风速、平均换热系数和阻力特性，结果表明，迎面风速和 换热系数随着角度的增大而增大，夹角越大风速越均匀，其结论对于目前空调使用的风冷冷凝器的优化设计具有 一定的指导作用。 关键词风冷冷凝器；百叶窗翅片；速度场；均匀性；CFD NumericalSimulationonAir—SideFluidFlowandHeatTransfer forTheAir—CooledCondenser Liu Chunhua Jinping，Liu ofelectrical china of 510640，china) (College engineering，southuniversityTechnology，Guangzhou Abstract CFDand methods．theexactnessofthe methodhasbeenverifiedtothe Combiningexperimental simulating condenserwith34 onthenumericalsimulationsoftwareofPHOENICSversion3．6andmodel— V—type degree．Based beenverified fluidflow heat and methods correct，air—sideand transfercharacteristicswithdifferent ing having angles different aresimulatedand ofthecondenserisdeterminedthe configurations analyzed．Theperformance by perfor— manceofair—sideheattransferbecausethedominantthermaIresistanceisontheair—side．Sotheair—sidefrontal heattransfer are withdifferentanddifferentcon— velocity，averagecoefficient，andpressuredrop investigated angles resultshowsthatthefrontal increaseswiththeincreaseofthe doestheheattrans— figurations．The velocity angle．SO fercoefficient．the uniformwith to distributionismore the