A Cluster Design Approach to Noise Reduction in a Centrifugal
Blower
Renjing
Cao and Jun Hu
College
of Energy and Power Engineering, Nanjing University of Aeronautics and
Astronautics,
Nanjing, Jiangsu
210016, China
Abstract
In this paper a cluster design
approach is proposed to achieve a good aerodynamic and acoustic performance of a
ventilation system while compact dimensions are maintained. Using this approach,
a new centrifugal blower has been designed. In addition an advanced measurement
system was adopted to test the aerodynamic and acoustic performance of the unit.
This was based on a pipe test rig with non-reflection acoustic boundary and was
designed to separate the mechanical and airflow generated noise. This
measurement device was located at the ventilation room supply diffuser.
By using this measurement system it was shown that the cluster
centrifugal blower provides a higher mass flow rate and a lower sound pressure
level than a conventional mechanical ventilation system.
Key words: acoustics,
centrifugal fan, mechanical ventilation, system noise.
References
Chong G, Cao R and Huang L:
(2001), “Experimental Identification of Aerodynamic and Vibroacoustic Noise in
Small Axial Flow Fans”, Proceedings of 8th Congress on Sound and Vibration,
2-6 June 2001,
Hong Kong
, pp669-676.
Gutin L: (1936) “On the sound field of a rotating
airscrew,” NACA TM 1195 (translated
from Russian in 1948).
Kameier F and Neise W: (1997) “Experimental Study of
Tip Clearance Losses and Noise in Axial Turbomachines and Their Reduction”, ASME
Journal of Turbomachinery, 119, (3), pp460-471.
Neise
W: (1988) “Fan Noise- Generation Mechanisms and Control Methods”, Proceedings
of International Conference on Noise Control Engineering, Avignon,
pp767-776.
Neise
W: (1992) “Review of Fan Noise Generation Mechanisms and Control Methods,” Proc.
of Fan Noise Symposium, CETIM Senlis, pp45-56
Pei
J: (1988) “Control of Fan Acoustic Noise through Motor Design”, Proceedings
of International Conference on Noise Control Engineering, Avignon,
pp785-788.
Sijtsma
P, Rademaker ER and Schulten JBHM: (1998) “Experimental validation of lifting
surface theory for rotor-stator interaction noise generation,” AIAA J.,
36, (6), pp900-906.
Swirydczuk
J: (2002) “Vortex Dynamics of the Stator Wake-Rotor Cascade Interaction,” Journal
of Turbomachinery, 124, (2),
pp400-412.
Wang
H and Tsukamoto H: (2001) “Fundamental Analysis on Rotor-Stator Interaction in
a Diffuser Pump by Vortex Method,” Journal of Turbomachinery, 123,
(4), pp737-747.
