Abstract
Flow fields in 2-blade and 4-blade half-ducted propeller fans for the outdoor units of air-conditioners were calculated with finite element method-based large eddy simulation (LES) with the aim of investigating what influence of blade number had on aerodynamic noise in this study. The aerodynamic noise of 2-blade propeller fan was smaller than that of the 4-blade by 5.9dB experimentally at an operating flow coefficient. As a result, we confirmed that the tip vortex (TV) had a great influence on half-ducted propeller fans. The TV trajectory and the blade pitch of the 2-blade propeller fan were longer than those of the 4-blade propeller fan. These suppressed the interaction between the TV and the adjacent blade, because the vorticity of the 2-blade propeller fan decayed along with the TV than that of the 4-blade propeller fan, and the minimum distance between TV and the adjacent blade of the 2-blade propeller fan was four times longer than that of the 4-blade propeller fan. The 2-blade propeller fan was therefore more silent than the 4-blade propeller fan.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: The Proceedings of Mechanical Engineering Congress, Japan
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
