双弓形折流板管壳式换热器壳程流动与传热数值模拟

发布时间：2018-11-24 15:38

【摘要】：随着我国在工业化道路上的不断深入,同时伴随着环境问题的日益突出,作为重要工业设备的换热器,其综合传热性能也越来越多的受到了人们的关注。通过对其壳程流场的数值模拟,我们可以得到很清晰的模拟结果,通过模拟结果可以指导我们对换热器进行改造和优化,从而可以提高它的综合换热率。本次模拟通过Solidworks和Gambit建立三维模型,经过ICEM对模型进行网格划分,运用标准k-ε模型、壁面函数法和SIMPLE算法进行FLUENT模拟。结果表明:对于单弓型折流板管壳式换热器,折流板缺口越大,前后产生的流动死区越大,但是整体壳程压降减小。对于双弓型折流板管壳式换热器,A板型的换热器换热效果较B板型换热器差一些,但是压降却比B板型换热器小。通过对比单、双弓形折流板换热器在相同工况下改变某一结构参数对传热和压降的影响可以得出,单弓形折流板换热器比双弓形换热器传热效果更好,但是压降也更为明显。通过对双弓形管壳式换热器在不同结构参数下的对比模拟结果进行分析,让我们对折流板的板间距、缺口大小,等参数对换热器壳程的换热效果、压降等所产生的影响有了深入的了解。也可以据此选出符合实际工况的结构最佳缺口高度和折流板间距的组合方式。对以后进行试验研究做了很好的铺垫,节省了大量的时间和费用,得出了具有指导意义的结果。
[Abstract]:With the deepening of industrialization in our country and the increasingly prominent environmental problems, the comprehensive heat transfer performance of heat exchanger, as an important industrial equipment, has been paid more and more attention. Through the numerical simulation of the shell flow field, we can get very clear simulation results, through the simulation results can guide us to transform and optimize the heat exchanger, so as to improve its comprehensive heat transfer rate. The 3D model is built by Solidworks and Gambit. The model is meshed by ICEM. The standard k- 蔚 model, wall function method and SIMPLE algorithm are used to simulate FLUENT. The results show that the larger the baffle gap, the larger the dead zone of flow, but the smaller the pressure drop of the whole shell. For double bow baffle shell heat exchanger, the heat transfer effect of A type heat exchanger is worse than that of B type heat exchanger, but the pressure drop is smaller than that of B type heat exchanger. By comparing the effect of single and double bow baffle heat exchangers on heat transfer and pressure drop under the same working conditions, it can be concluded that the heat transfer effect of single bow baffle heat exchanger is better than that of double bow baffle heat exchanger, but the pressure drop is also more obvious. Through the analysis of the results of comparison and simulation under different structural parameters, the heat transfer effect of the baffle plate, the size of the notch, and the heat transfer of the shell side of the heat exchanger are obtained, by analyzing the results of the simulation of the double bow tube and shell heat exchanger under different structural parameters. The effects of pressure drop are well understood. The combination of the optimum notch height and baffle spacing can also be selected according to the actual working conditions. The experimental research in the future has made a good cushion, saved a lot of time and cost, and got the instructive result.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK172

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