低压轴流风机的气动设计及性能-流体机械及工程专业论文.docx

华 华 中 科 技 大 学 硕 士 学 位 论 文 I I 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。 关键词：低压轴流风机 变环量 弯掠叶片 气动-声学性能 II II Abstract The equivalent vortex flow pattern is widely used in the traditional design of axial fan. The method is relative simple, and has irrotational motion form. So the method is considered efficient. But the method also has obvious disadvantages. The blade designed by the method is too twist. And the relative velocity grows too fast along the radial direction. For gas media, it will lead the Mach number to grow too fast. Arbitrary vortex flow pattern is the optimal flow pattern for increasing efficiency and reduceing noise.The method can meet the demand of various designs. Skewed-Swept technique has been used in the design of axial fan. The technique can also increase efficiency and reduce noise. Both equivalent vortex flow pattern and arbitrary vortex flow pattern were used in the thesis. And Skewed-Swept technique was added to the design.The thesis mainly included the following aspects: First, the special module of aerodynamic design was built based on both equivalent vortex flow pattern and arbitrary vortex flow pattern Secondly, the parametric modeling module of axial fan was built by the secondary development of SolidWorkes software. Finally, the aerodynamic performance and aeroacoustic characteristics of axial fan were analysed. The axial fans designed by equivalent vortex flow pattern, arbitrary vortex flow pattern and Skewed-Swept technique were compared emphatically. Keywords: Low Pressure Axial Fan; Arbitrary Vortex Flow Pattern; Skewed-swe