【作者】 田铖；

【导师】 张欢；

【作者基本信息】 天津大学 ， 供热、供燃气、通风与空调工程， 2003， 硕士

【摘要】 轴流风机是地铁车站和隧道区间内通风的主要设备，其流量，压力和效率等指标备受人们关注。地铁轴流风机的设计很大程度上要依赖试验，设计成本相对较高。如果用数值模拟的方法对地铁轴流风机的流场进行模拟，得出指导性和方向性的结果，可以帮助选择性能最佳的设计，具有明显的应用价值。本文用 CFD商用软件 Fluent6.0 对地铁轴流风机的流场进行模拟并做出分析。本文假设定常条件，采用 k－ε双方程湍流模型，SIMPLE 算法对直径为 1.8米地铁轴流风机的流场进行了模拟，着重对进口回流区，压力场，速度场和矢量场等进行讨论，经过和实验结果比较，模拟结果很理想。在此基础上，本文将风机支架进行旋转，并且针对不同的旋转角度分别进行计算。通过对风机流场和风机效率等的分析，得出了风机支架旋转角度对风机性能的影响规律：支架的旋转会引起风机正转效率的下降和反转效率的提高。假如采用较小的支架旋转角度，那么风机的反转效率会有较大程度的提高，同时正转效率不会明显下降。另外，本文在复杂模型的建立和简化，网格的生成，计算模型的采用等方面做了一些有益的探索，希望能对相似类型的数值模拟问题提供借鉴。更多还原

【Abstract】 As axial-fans are main devices for ventilation in subway, the technical indexessuch as flow rate, pressure and efficiency for axial-fan in subway receive greatattention in the design. Currently, the design of axial-fan in subway depends mainlyon experimental data, which is of high cost. Alternatively， simulating the internalflow properly with numerical method can provide computational results in guiding thedesign and help us to choose the best design plan. Such effort is worthwhile since itgreatly reduces the design cost. In this thesis we simulate and analyze the flow field ofaxial-fan in subway with a commercial CFD software——Fluent 6.0. Under the assumptions of steadiness, we simulate the flow field of axial-fan insubway with k－ε standard model and SIMPLE method. The diameter of this fan is1.8m. Our discussions focus on reverse flow region in suction area, pressuredistribution, velocity distribution and vector filed. The calculation results show goodagreement with the data taken from experiment. Furthermore, we rotate the brackets and simulate the flow field for each bracketangle. By analyzing the flow field and total efficiency, we find out the rule of bracketangle affecting technical indexes：Once the brackets rotate, the total efficiency ofaxial-fan under the blades’ standard-rotation will decrease, while the total efficiencyof axial-fan under the blades’ reverse-rotation will increase. If the bracket-rotationangel is small enough, the total efficiency of axial-fan under the blades’reverse-rotation will increase greatly, at the same time the total efficiency of axial-fanunder the blades’ standard-rotation will not decrease obviously. In addition, this thesis is meaningful in many aspects such as: how to create andsimplify complex model, how to create grids and how to choose best calculationmodel for different models.更多还原