机械科学与技术2018，Vol.37Issue(4)：519-524,6.DOI:10.13433/j.cnki.1003-8728.2018.0405
表面楔形结构对发动机冷却风扇性能影响研究
Research on Influence of Wedge Structure on Performance of Engine Cooling Fans
李娜 1朱茂桃 1李凯强 1朱彩帆1
作者信息
- 1. 江苏大学汽车与交通工程学院,江苏镇江212013
- 折叠
摘要
Abstract
To study the influence of the wedge structural design on the aerodynamic and aeroacoustic performance of engine cooling fans,a series of numerical simulations are carried out with CFD (Computational Fluid Dynamics)/CAA (Computational Aerodynamic Acoustic) distributed coupling method.The flow field and acoustic field of two cooling fans without and with wedge structures on its suction surfaces are analyzed under the rated condition.The results show that the aerodynamic performance of cooling fans is vulnerable to the wedge structures.But noise performance is obviously influenced.The noise values at the inlet and outlet of the cooling fan with wedge structures are decreased by 8.8％ and 8.9％ respectively while the volume flow increases slightly.Through specific analyses of flow field and acoustic field of two cooling fans,it can be concluded that the wedge structures act as "vortex flow generators" on the suction surfaces.They advance the transition from laminar flow to turbulent.Thus the vortex noise induced by premature airflow separation around the blade surface is reduced obviously,which lead to a definite decline in the overall noise.关键词
发动机冷却风扇/气动性能/噪声性能/楔形结构/涡流发生器/CFD/CAA分布耦合方法Key words
aeroacoustic/aerodynamic/computational fluid dynamics/acoustic field/vortex flow/structural design分类
机械制造引用本文复制引用
李娜,朱茂桃,李凯强,朱彩帆..表面楔形结构对发动机冷却风扇性能影响研究[J].机械科学与技术,2018,37(4):519-524,6.
