轴流风机的节能研究与数值模拟

发布时间：2018-05-15 21:37

本文选题：轴流风机 + 运行节能　；参考：《东北大学》2012年硕士论文

【摘要】：在提倡可持续发展、节约能源的大背景下,本文从整体入手,综合分析影响风机性能的因素。通过对当下关于轴流风机节能效果的研究,包括风机的运行调节节能和设计节能,首先分析轴流风机的设计节能的原理以及计算方法(流型设计和结构设计),并分别建立轴流风机的最优流型的气动设计模型和最优结构设计模型,其次对比分析各种运行调节的调节原理、节能效果、适用范围以及投资大小等。在满足轴流通风机设计参数的条件下,采用工程设计方法一一孤立叶型法,分别用等环量指数、变环量指数设计一台轴流风机,进而结合最优化理论设计最优环量指数时的风机,最后运用GAMBIT对所设计的三台轴流风机完成三维建模。在风机的节能设计环节,本文借助先进的CFD技术,对影响轴流风机性能的主要参数进行对比模拟,同时观测风机内部流动情况。通过对比分析三种设计方法的合理性以及最优环量下的节能效果,继而寻找一条提高风机效率、降低设计成本从而实现风机节能的途径。在风机的节能运行环节,本文同样借助CFD模拟,对本文所优化的风机进行工频和变频下的对比模拟,考察变频调速在风机的运行调节中的节能作用,从而为风机运行的节能研究提供依据。本课题中,通过对不同环量指数情况下的功率、压力以及效率的对比分析,发现采用最优化环量指数所设计的轴流风机其节能效果要明显好于其它两种方法。通过分析云图发现风机叶轮尾部涡流和叶顶尾迹涡流也会对风机的节能效果产生影响。而对于采用了变频技术进行运行调节的风机,其节能效果也要好于改变管网特性曲线的运行方案,这也论证了变频调速在风机的运行调节中具有良好的节能效果。
[Abstract]:Under the background of advocating sustainable development and saving energy, this paper comprehensively analyzes the factors that affect the performance of fan. Through the current research on the energy saving effect of axial flow fan, including the operation regulation and design energy saving of fan, Firstly, the design principle and calculation method of axial flow fan (flow pattern design and structure design) are analyzed, and the aerodynamic design model and optimal structure design model of axial flow fan are established, respectively. Secondly, the regulation principle, energy saving effect, applicable range and investment size of various operation regulation are compared and analyzed. Under the condition of satisfying the design parameters of the axial fan, an axial fan is designed by using the engineering design method, the isolating blade shape method, the equal ring index and the variable ring volume index, respectively. Combined with the optimization theory, the fan is designed when the optimal annular index is used. At last, three axial flow fans are designed by GAMBIT to complete the 3D modeling. In the energy saving design of the fan, the main parameters affecting the performance of the axial fan are compared and simulated with the help of advanced CFD technology, and the flow inside the fan is observed at the same time. By comparing and analyzing the rationality of the three design methods and the energy saving effect under the optimal ring volume, a way to improve the fan efficiency and reduce the design cost to realize the fan energy saving is found. In the link of energy saving operation of fan, this paper also uses CFD simulation, carries on the contrast simulation under the power frequency and the frequency conversion to the fan optimized in this article, inspects the energy saving function of the frequency conversion speed regulation in the fan operation regulation. So as to provide the basis for energy conservation research of fan operation. In this paper, by comparing and analyzing the power, pressure and efficiency of different ring volume exponents, it is found that the energy saving effect of the axial fan designed by the optimal ring volume index is obviously better than that of the other two methods. By analyzing the cloud map, it is found that the swirl at the tail of the impeller and the wake vortex at the top of the blade will also affect the energy saving effect of the fan. For the fan with frequency conversion technology, its energy-saving effect is better than that of changing the characteristic curve of pipe network, which also proves that the frequency conversion speed regulation has good energy-saving effect in the operation regulation of fan.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH432.1

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