轴流式风机通流部件特性研究

发布时间：2018-08-16 15:17

【摘要】：目前,火力发电站的单机容量越来越大。动叶可调式轴流风机因其在大流量时具有较宽的高效区和较高的经济性,而被国内外300MW及以上的大容量火电机组广泛采用。为了对轴流风机的内部部分流动特性进行详细的了解,为引风机的结构优化设计提供理论依据和参考数据,本文利用CFD数值计算软件对引风机内部的流动状况及性能进行数值模拟。本文以某电站的引风机为例,采用绘图软件CAD与流体计算软件FLUENT相结合的方法,重点研究不同配置的进气箱内部流动情况,对不同配置风机进口箱的内流流线、静压分布以及性能进行分析比较,寻找进气箱优化设计途径与方法。本文在不同流动条件下,对进口预旋角不同的轴流式引风机的内部流场及其流动特性进行重点分析,了解叶轮进口预旋角与风机内流特性的关系,通过模拟初步确定最佳叶轮进口预旋角度,为叶轮内流场的优化提供参考。同时,本文通过改变动叶可调轴流风机的叶片安装角,运用数值模拟软件,得到不同安装角时的引风机的速度和压力的分布情况,了解叶轮安装角与风机性能的关系,对不同安装角的引风机的性能进行分析比较,为现场的实际引风机的设计、节能改造提供理论依据。
[Abstract]:At present, the single unit capacity of thermal power station is more and more large. The adjustable axial fan with moving vane is widely used in large capacity thermal power units at home and abroad because of its wide high efficiency area and high economy when the flow rate is large. In order to understand the internal flow characteristics of axial fan in detail and provide theoretical basis and reference data for the structure optimization design of induced fan, In this paper, CFD software is used to simulate the flow state and performance of the induced fan. In this paper, taking the induced fan of a power station as an example, the method of combining drawing software CAD with fluid calculation software FLUENT is used to study the internal flow situation of the inlet air box with different configurations, and the inner flow streamline of the inlet box of the different configuration fan is studied. Static pressure distribution and performance were analyzed and compared to find the optimal design approach and method. In this paper, the internal flow field and its flow characteristics of axial flow induced fan with different inlet prerotation angles are analyzed in different flow conditions, and the relationship between the inlet prerotation angle of impeller and the inner flow characteristics of fan is understood. The optimal inlet prerotation angle of impeller is preliminarily determined by simulation, which provides a reference for the optimization of impeller flow field. At the same time, by changing the blade installation angle of the adjustable axial flow fan with moving blade and using the numerical simulation software, the distribution of velocity and pressure of the induced fan with different installation angles is obtained, and the relationship between the installation angle of the impeller and the performance of the fan is understood. The performance of the induced fan with different installation angles is analyzed and compared, which provides the theoretical basis for the design and energy saving transformation of the field actual induced fan.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH432.1

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