中文摘要：

为研究小型轴流风扇的三维流场特点,选取5叶片和7叶片的两种风扇,利用Fluent软件中的RNGk-ε湍流模型对其进行定常流动数值模拟,对比分析两种叶片风扇的静特性和内部流动特性。结果显示：流量在0.006～0.010 5 m3/s,压力的变化不明显,在这个范围之外,压力随着流量增加而减小;风扇的进口全压先降低后增加,在1/2弦长处全压出现突变性增加;在叶顶间隙内,叶顶静压值随着半径的增加而增加;叶片吸力面静压值、涡强、速度值均较小,气流进入叶片后,沿流道速度逐渐增加,吸力面叶顶产生叶尖涡,叶尖涡撞击邻近叶片的压力面对气动噪声影响很大。

英文摘要：

In order to study three-dimensional flow fields characteristics of small-size axial flow fan,fans of 5 blades and 7 blades are simulated respectively using Fluent software RNG k-ε turbulence model and steady flow functions.Static characteristics and the internal flow performance of the two fans are analyzed comparatively based on the numerical simulation results.The conclusions are as follows： the pressure does not change significantly within（0.006m3/s,0.0105m3/s）,but outside the range pressure gradient decreases gradually with flow rate increasing;the inlet total pressure increases gradually after that lowers firstly,which occurs in increasing abruptly in 1/2 chord length;with increasing of radius,static pressure increases in the tip clearance;In inlet suction side,static pressure,vorticity magnitude and speed are very small.The velocity increased gradually and blade tip vortex appears near the casing and suction surface after air flows into channel and the aerodynamic noise is very sensitive to the tip vortex which impacts the pressure surface of the close blades.