Abstract
The effect of blade sweep has been studied numerically with the Lattice Boltzmann Method on a family of low-speed free-vortex axial fans with sweeps of ±45°. Good overall aerodynamic agreement is first demonstrated on all fans at the design condition, particularly in the tip gap. The local larger wall-pressure fluctuations seen in the unswept and backward swept fans compared to the forward case are traced to the stronger tip vortices that remain in the rotational plane or even move upstream. These stronger and faster vortices interacting with the fan blades are then responsible for the larger noise levels observed in the acoustic spectra of these fans, and particularly for large subharmonic humps. Excellent agreement between experimental and numerical noise predictions is finally reported stressing the dominant tip noise.
Funder
Valeo (France) through the Chaire Aéroacoustique de l’Université de Sherbrooke
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering
Reference23 articles.
1. Moreau, S. (2021). Fundamentals of High Lift for Future Civil Aircraft, Springer.
2. Carolus, T., and Beiler, M. (1997, January 12–14). Skewed blades in low pressure fans—A survey of noise reduction mechanisms, AIAA 97-1591 paper. Proceedings of the 3rd AIAA/CEAS Aeroacoustics Conference, Atlanta, GA, USA.
3. Grasso, G., Roger, M., and Moreau, S. (2021). Analytical model of the source and radiation of sound from the trailing edge of a swept airfoil. J. Sound Vib., 493.
4. Experimental investigation of the interplay between the sound field and the flow field in skewed low-pressure axial fans;Moreau;J. Sound Vib.,2019
5. Influence of Swept Blades on Low-Order Acoustic Prediction for Axial Fans;Zarri;Acoustics,2021
Cited by
10 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献