【作者】 周子筠；

【导师】 冀春俊；

【作者基本信息】 大连理工大学 ， 动力机械及工程， 2006， 硕士

【摘要】 工业汽轮机在我国的能源和工业生产中使用广泛，因此工业汽轮机的研发和应用占有十分重要的地位。本文研究的对象为杭州汽轮机有限公司生产的600MW电站给水泵汽轮机，该机型目前在国内市场上应用广泛，占有率很高。但是随着汽轮机设计技术水平的不断提高，该产品已显示出设计技术老化，热效率偏低，竞争力不强的弱点。因此对其进行对其进行技术改进，可以带来一定的经济效益的同时也可以带来很好的环境效益和社会效益。 本文研究的内容为汽轮机头部的气动性能，利用Pro／E，ICEM-CFD及STAR-CD软件对汽轮机头部流场建立一个三维的数值模拟计算平台。对内部流场进行数值模拟，并详细分析内部流场的气动性能，提出改进结构设计的建议和方法。 针对数值模拟分析过程中发现的问题，本文对汽轮机头部阀门进行了分析改进，改善了内部气动性能。本文对汽轮机调节级的结构设计进行了初步探讨，分析了影响叶栅气动性能的主要因素。使用NUMECA软件包的Design3D模块对动静叶片进行改进设计，尝试以改变叶片型线的方法来减少叶片的型面损失为主，从而到提高叶栅气动性能。并运用子午面收缩静叶栅的设计技术改善静叶的气动性能。通过对改进方案进行数值计算，结果表明，对调节级的改进效果明显，单级效率提高了1.57个百分点。 本文的研究工作在一定程度上为汽轮机头部流场分析和阀门、调节级设计提供了建设性的意见，所尝试的调节级叶片改进设计方法可以为汽轮机叶片设计研发缩短研制周期，提高效率，节约成本。更多还原

【Abstract】 Industrial steam turbine is widely used in power plant, chemical industry and many other important fields. The performances of the industrial steam turbines have great influence on the national economy. Steam turbine driving furnace feed water pump of 600MW power plant is one of the key products in the industrial steam turbine market and there is a great demanding in the current market. The improvement of the design of the steam turbine may bring a great profit, economically, environmentally, or socially.To improve the performance of the steam turbine, it is crucial to understand the flow structure in the machine. Based on the computational fluid dynamics software, STAR-CD, a numerical analytic platform was developed in this paper, after a detailed discussion of the flow controlling equation, turbulence modeling, discretization of the governing equation, geometry modeling of the steam turbine, mesh generation, boundary condition, etc.. The numerical simulations of the flow in the head of the steam turbine were presented.Based on the careful analysis of the flow field, the key factors affecting the performance of the machine were discussed and various measures were proposed to improve the design of the steam turbine. Some modifications were made so as to improve the stabilization of the internal flow and the dynamic performance as well.Intensive researches were carried out on the blade profile modification with the Design3D, a module of NUMECA, in attempt to reduce the aerodynamic losses in the stator blades and rotor blades as well. Results indicate that tip convergent end wall techniques can effectively reduce the flow losses in the stator blade, and rotor blade can be effectively modified by a redesign of the blade profile. An overall efficiency increase of 1.57 percent was achieved with intensive numerical experiment.The research results presented in this thesis may provide some guideline for the design of the inflow turbine. The numerical analytic platform for the flow in the inflow turbine developed to be a powerful and practical tool in the design of the inflow turbine that can shorten the design cycle and cut the design cost effectively.更多还原