• CN:11-2187/TH
  • ISSN:0577-6686

›› 2014, Vol. 50 ›› Issue (18): 167-176.

• 论文 • 上一篇    下一篇

板翅换热器流道结构改进与流体流动性能分析

刘景成;张树有;周志勇   

  1. 浙江大学流体传动与控制国家重点实验室;杭州杭氧股份有限公司国家级技术研究中心设计院
  • 发布日期:2014-09-20

Research on Rotor Creep Properties under Bending Residual Stress

SUN Yanping;PANG Chunfeng   

  1. North China Electric Power Research Institute Co., Ltd.
  • Published:2014-09-20

摘要: 研究超大型空分装备中板翅式换热器流道改进结构及其对换热器内流体流动影响,设计一种新型板翅换热器流道结构,该新型流道结构可以改变换热器流道内流体的流动方向,促使流体在板翅换热器内部呈M形流动,从而延长换热器中流体的流动距离,增大流体的湍流性能,强化换热器的换热效果。对板翅式换热器流道中转折位置流体的分布情况进行分析,着重分析换热器流道转折位置与流体流动速度、压力变化以及流体湍流性能之间的对应关系。采用Fluent分析流道结构改进前后板翅式换热器内流体的流动情况,可以看出改进后的流道结构可以显著增强换热器内流体的湍流性能,与结构改进之前的传统流道相比,新型流道结构的板翅式换热器通过增大内部流体的湍流性能的方式,提升换热器的换热效率。

关键词: 空分装备;板翅式换热器;流道改进结构;湍流性能

Abstract: Central bending analysis of a 600 MW thermal power generating unit’s HP-IP combined casing rotor is conducted and it concludes that high temperature creep and residual stress is the main reason leading to permanent plastic deformation. First, they build the fine three-dimensional solid model with the FEA software ANSYS according to the rotor structure. It carries out finite element analysis of temperature field and stress field. On this basis, heat-solid coupling analysis is proceed, by dealing with the experiment data, they get the parameters of Norton creep model and implement finite element analysis of high temperature creep and residual stress in ANSYS. The research show that simply high temperature creep is not sufficient to cause the rotor bending during start-up process, but rotor bending will happen in short time if coupled with the residual stress. Using Norton three-parameter model and generating residual stress method are proved more effectively. The conclusion drawn can be referenced and guided for analysing the HP-IP combined casing rotor’s central bending.

Key words: rotor bending;high temperature creep;residual stress;ANSYS

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