A numerical study on the unsteady flow behavior and the performance of an automotive sirocco fan
A numerical study on the unsteady flow behavior and the performance of an automotive sirocco fan
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DOI：
10.1007/s12206-008-0728-7
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发表时间：
2008-10-01
影响因子：
1.6
通讯作者：
Baek, Jehyun
中科院分区：
文献类型：
--
作者：
Jung, Yohan;Baek, Jehyun
汽车用多叶片风机在空调装置中得到了广泛的应用。了解汽车用多叶片风扇的流动特性，对于满足高效、低噪声的发展趋势是十分必要的。本文利用FLUENT软件对西洛克风扇的三维非定常、不可压缩流动特性和性能进行了数值计算。数值计算采用雷诺平均Navier-Stokes方程和标准k -ε湍流模型。采用滑移网格模拟叶轮与蜗壳的相对瞬态运动。结果发现，非活性区和二次流降低效率，因为它们引起内部损失。为了提高多叶片风扇的效率，采用两个几何变量进行了参数研究。减小叶轮宽度可以减小非活性区和二次流的相对尺寸。改变切断位置对效率影响不大。因此，可以通过减小叶轮的宽度来提高效率。
An automotive sirocco fan has been widely Used in air-conditioning devices. It is essential to Understand the flow characteristics of an automotive sirocco fan to satisfy the trends for more efficient and less noise. In this study, numerical calculations were conducted to explain the three-dimensional Unsteady, incompressible flow characteristics and performance of the sirocco fan using FLUENT. Reynolds-averaged Navier-Stokes equations with the standard k - epsilon turbulence model were Used for the numerical analysis. The sliding mesh Was Used to simulate the relative transient motion of impeller against scroll. It was found that the inactive zone and the secondary flow reduce efficiency because they cause internal losses. A parametric study was performed to improve efficiency of the sirocco fan, using two geometric variables. Reducing the width of impeller could decrease the relative size of inactive zone and secondary flow. Changing the position of cut-off had little influence on the efficiency. Thus an improvement of efficiency could be achieved by reducing the width of impeller.