【作者】 李平；

【导师】 蒋丹；

【作者基本信息】 上海交通大学 ， 机械设计及理论， 2007， 硕士

【摘要】 随着现代计算机技术的飞速发展以及计算机辅助工程(CAE)技术的日益成熟,工程系统中的各种数学模型和数值算法不断完善与更新,使得以计算流体动力学(CFD)为基础的CAE技术在流体的科学研究和实际工程中越来越受到现代科技界和工程界的重视。目前,对工业设备中一些复杂热力设备(如管壳式换热器、大型冷凝器、冷却塔等)的数值模拟研究与应用正在逐步发展。通过与上海动力设备有限公司的科研合作,本文提出将数值模拟的分析方法应用到高压给水加热器设备,以期通过对其温度场和流场的CAE分析研究,对该企业在设备及其零部件的设计优化和改进方面提供更好的手段和更可靠的依据。经过对高压加热器设备的传统设计方法和设备特点的分析,并结合企业当前的实际情况,本文运用大型通用有限元分析软件ANSYS对高压加热器的关键部位,如蒸汽冷却段入口、上级疏水入口及蒸汽冷却段内部等,进行了温度场、流场的分析研究。参照实际工艺参数,并结合理论计算,对所研究的问题进行合理的简化和假设,建立对应的数学模型(如湍流模型、多孔介质模型)和有限元模型,实现对该设备的数值模拟和仿真。其模拟结果与设备设计中的理论计算结果基本相符,对制造企业在产品设计与研发方面具有实际的指导意义和参考价值。另外,采用三维数值模拟与二维数值模拟相结合的方式,在三维分析的基础上提出二维的简化模型,利用ANSYS参数化设计语言APDL,更多还原

【Abstract】 With the development of modern computer technology and Computer Aided Engineering (CAE) technology, various mathematical models and numeric algorithms have been perfected and updated. CAE technology based on Computational Fluid Dynamics (CFD) is being paid more attention in science research and practical engineering. Nowadays, the research and application of numerical simulation is working up for some complex heating power equipments such as shell and tube exchanger, large-scale condenser, cooling tower etc. In this paper numerical simulation is applied to high-pressure heater to analyze its temperature field and flow field by cooperating with Shanghai Power Equipment Co.Ltd (SPEC), hoping to provide better approaches and more reliable references for the design optimization and the improvement of equipment and parts in SPEC.According to the equipment’s features and company’s situation, high-pressure heater’s vital areas such as temperature fields at inlet of DSZ (Desuperheating Zone), drips inlet, and flow field and temperature field inside DSZ, were studied with universal finite element analysis software ANSYS. After making some simplifications and hypothesis, corresponding mathematical models including turbulence model, porous media model, and finite element models were set up and then the simulations were realized. The results are in accord with theoretical computing results and can be regard as references for engineering design.What’s more, the porous media model in the thermal shields was simplified as 2-D model based on 3-D simulation. The fluid in the DSZ with different baffles was simulated with ANSYS Parameter Design Language更多还原