A new apparatus is developed to control the airflow field at the inlet of a centrifugal blower system. The new apparatus has desirable effects on the flow and noise performance of an HVAC air-handling system. The apparatus design parameters are defined, and are investigated using the design-of-experiments techniques. Experimental airflow and sound pressure levels data are used to screen and evaluate the apparatus design parameters. The effects of two parameters and their interaction on the overall sound pressure levels and discrete tones, sound quality, are defined to aid in optimizing the design. The apparatus controls the flow field to increase the effectiveness of the blower fan, and to minimize the energy losses and air-rush noise. Its effect on the air velocity in the radial direction of a centrifugal fan is investigated by Laser Doppler velocity measurements (LDV). Other relationships with the centrifugal fan design parameters are described and illustrated by LDV and computational fluid dynamic (CFD) analysis. The advantages of the apparatus include the reduction of air-handling system SPL by 1-3dBA (2-6%) and power consumption by (7-15%) through energy conservation, with minimal change in the system airflow rate.
New design feature to improve the sound and efficiency of automotive HVAC centrifugal blower systems
1999
8 Seiten, 9 Quellen
Conference paper
English
Some aerodynamic aspects of centrifugal fan characteristics of an automotive HVAC blower
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