加速型 IGV 对高负荷轴流风扇性能影响研究

目的 为了进一步提升小型高负荷轴流风扇在微小空间的高通流及高负荷能力,提出一种加速型进口导叶(IGV)结构设计方案。方法 采用三维设计软件Pro/E设计不同加速型IGV,通过数值模拟方法研究其对风扇不同流量系数下的压力系数、全压效率以及流道损失的影响。结果 采用加速型IGV使得风扇流道内通流能力增强,叶片尾缘气流延缓分离,下游流动更加均匀;随着进口气流加速程度的提高,设计工况点全压效率基本呈单调递增的趋势;相比无加速IGV风扇,当IGV加速程度为1.1、1.2时,在设计工况点,风扇压力系数提升百分比为1.61%,1.24%,效率分别提升了3.49%,5.05%;IGV的加速程度从1.0增至1.5时,风扇效率提高6.69%。结论 在小型高负荷轴流风扇中,加速型IGV与无加速IGV相比,加速型IGV对风扇压力系数以及效率的提升具有更优的效果,并且IGV加速程度也并非越大越好,当加速程度为1.1、1.2时风性能表现最优,为小型高负荷轴流风扇的研究提供相关设计参考。

Research on the Effect of Accelerated Inlet Guide Vane on the Performance of High-load Axial Fans

Objective In order to further improve the high-pass flow and high-load capacity of small high-load axial flow fans in small space an accelerated inlet guide vane IGV structure design scheme was proposed. Methods The 3D design software Pro / E was used to design different accelerated IGVs and their effects on the pressure coefficient full pressure efficiency and runner losses at different flow coefficients of the fan were investigated by numerical simulation methods. Results The use of accelerated IGV increased the flow capacity in the flow channel delayed the separation of the airflow at the trailing edge of the blade and made the downstream flow more uniform. With the increase in the acceleration degree of the inlet airflow the total pressure efficiency at the design point basically showed a monotonous increasing trend. Compared with non-accelerated IGV fan when the IGV acceleration degree was 1. 1 and 1. 2 at the design operating point the fan pressure coefficient was increased by 1. 61% and 1. 24% and the efficiency was increased by 3. 49% and 5. 05% respectively. When the acceleration degree of IGV increased from 1. 0 to 1. 5 the fan efficiency was increased by 6. 69%. Conclusion In small high-load axial flow fans accelerated IGV has better effects on fan pressure coefficient and efficiency than non-accelerated IGV and the greater the acceleration degree of IGV is not the better. When the acceleration degree is 1. 1 and 1. 2 the wind performance is the best which provides relevant design references for small high-load axial flow fans