关于固定管板式换热器不同工况下温度场的数值模拟

The Numerical Simulation of the Temperature Field of the Fixed Tube-Plate Heat Exchanger under Different Working Conditions

摘要: 本文模拟固定管板式换热器不同工况下的温度场情况。研究方法是：使用UG软件构建固定管板式换热器的流场模型，再用ANSYS软件对固定管板式换热器在不同管形(内置)、不同管数、换热面有无折流板、有无螺纹、不同换热材料、耦合与非耦合等情况时的温度场情况进行数值模拟分析。本文中的流体选用无相变、不可压缩的水和酒精，固体选用铝和钢。研究结论：1) 非耦合时，同样前提下：当换热器加设折流板、内设管芯棱边越多、管芯数目越多、换热面内设螺纹、流体进口流速越小、换热材料导热系数越大时换热效果越好；2) 耦合时，同样前提下：① 同流体(固体)，不同固体(流体)，导热系数大的材料换热效果好；② 换热面有螺纹比没有螺纹换热效果更好；3) 同样前提下，耦合比非耦合换热模拟结果更准确。

Abstract: The situation of the temperature field of the fixed tube-plate heat exchanger is simulated under different working conditions in this thesis. The research methods are as follows. The models of flow field are constructed using UG software, then the situation of the temperature field of the fixed tube-plate heat exchanger is simulated using ANSYS software when the shape and the number of tube those are set up in the heat exchanger are different, the baffle plates and the threads are set up or not in the heat exchange surface, or the heat exchange materials is different, or the condition is coupling and uncoupling, finally the simulation results are analysed. Water and alcohol that can-not be compressed without phase change are used as the fluid materials; aluminum and steel are used as the solid materials. The research conclusions are as follows: 1) Under the uncoupled cir-cumstance and on the same premise, the heat transfer effect of the heat exchanger will become better when the baffle plate is added; the tube core having more edges or more tube cores are set in the heat exchanger, or the thread is set in the heat exchange surface, or the inlet velocity of fluid is lower, and the thermal conductivity of heat exchange material is higher; 2) Under the coupled cir-cumstance and on the same premise: ① The heat transfer effect will become better when the thermal conductivity of the material of the heat exchange is higher when fluid (solid) is same, solid (fluid) is different; ② The heat transfer effect will become better in the situation of the heat ex-change surface with screw thread than that without screw thread; 3) On the same premise, the cou-pling simulation results of the heat exchanger are more accurate than the uncoupled corresponding results.