低压轴流风机的气动设计及性能分析

发布时间：2019-04-03 19:13

【摘要】：低压轴流风机的传统设计方法中,等环量流型是使用最多的流型,这主要是因为该流型比较简单,并且效率较高。但等环量流型也存在一些缺点,如叶片扭曲得很厉害,沿半径方向的相对速度变化较大,这对于气体介质来说,将导致马赫数较大。而变环量流型则可以提高风机效率,降低噪声,更好地满足各种设计要求。另外,弯掠技术已经成功应用于低压轴流风机的设计之中,利用弯掠技术可以提高轴流风机的效率、降低噪声。本文采用包括等环量和变环量在内的任意流型对低压轴流风机进行了设计,并在此基础上设计了弯掠叶片,具体工作如下: 首先,采用Visual Basic6.0建立了基于任意流型以及弯掠技术的低压轴流风机设计程序模块。接着,通过对三维建模软件Solidworks进行二次开发,实现了轴流风机的参数化建模。最后,利用CFD软件FLUENT对所设计的轴流风机进行数值模拟,分析其气动-声学性能,重点对比了采用等环量流型、变环量流型设计的低压轴流风机以及采用弯掠叶片的低压轴流风机与的气动-声学性能。
[Abstract]:In the traditional design method of low-pressure axial-flow fan, the equal-ring flow pattern is the most commonly used flow pattern, which is mainly because of its simplicity and high efficiency. But the isocyclic flow pattern also has some shortcomings, such as the blade twist is very serious, the relative velocity along the radius direction changes greatly, which will lead to a larger Mach number for the gas medium. The variable loop flow pattern can improve the fan efficiency, reduce the noise, and better meet the design requirements. In addition, the bending and swept technology has been successfully used in the design of low-pressure axial-flow fan. The efficiency of axial-flow fan can be improved and the noise can be reduced by using the bending-swept technology. In this paper, the low pressure axial flow fan is designed by using arbitrary flow pattern including equal ring and variable loop. On the basis of the design, the bending and swept blade is designed. The concrete work is as follows: first of all, the main work of this paper is as follows: first of all, The design program module of low pressure axial flow fan based on arbitrary flow pattern and bending and swept technology was established by Visual Basic6.0. Then, the parameterized modeling of axial flow fan is realized through the secondary development of 3D modeling software Solidworks. Finally, the CFD software FLUENT is used to simulate the axial-flow fan, and the aerodynamic-acoustic performance of the fan is analyzed, and the equal-ring flow pattern is compared with each other. Aerodynamic-acoustic performance of low-pressure axial-flow fan designed with variable annular flow pattern and low-pressure axial-flow fan with curved and swept blades.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH432

【参考文献】