基于FLUENT的凝汽器壳侧流动模拟边界条件设置探讨

The Discussion of the Setting of the Boundary Condition for the Numerical Simulation of the Condenser Basing on FLUENT

基于FLUENT平台探讨了凝汽器壳侧流动数值模拟边界条件的设置,改进了多抽气口凝汽器壳侧流动出口边界条件的设置。首先讨论了实现凝汽器壳侧流动模拟的进、出口边界条件的若干设置组合,明确了在不同工况下更容易开展凝汽器壳侧流动模拟的进、出口边界条件组合。然后将该进、出口边界条件组合应用于某单抽气口凝汽器性能的数值模拟上,获得理想的模拟结果;对某多抽气口凝汽器性能的数值模拟的应用表明,需对计算区域出口边界的设置进行一定的改进,将压力出口边界设在抽气管内壁面可以获得有参考价值的模拟结果。为凝汽器工程设计人员在FLUENT平台上实现各种形式管束模块凝汽器壳侧流动的数值模拟,准确获得凝汽器性能的变化提供有益的参考。

The setting of the boundary condition for the numerical sinmlation of the condenser basing on FLUENT was discussed. The setting of the boundary condition for condensers with multiple suction ports was improved. Several setting combinations of inlet and outlet boundary conditions were discussed first for implementing the numerical sinmlation of the condenser. The setting combination of inlet and outlet boundary conditions was determined for easily sinmlating the shell- side flow of condenser shell under different operating conditions. The setting combination that had been determined was applied to one condenser with one suction port. And the good sinmlation result was got. The application of the setting combination on the condenser with multiple suction ports showed that it was neeessary to improve the setting of the outlet condition. The simulation result with reference value could be obtained by putting the pressure outlet boundiry on the inner wall of the suction pipe. The research work could provide a useful reference for condenser engineer to simulate the shell- side flow for condensers with various types of tube bundle on FLUENT platfory.