To reduce the noise of the T9-19No.4A centrifugal fan, whose impeller has equidistant forward-swept blades, two new impellers with different blade spacing were designed and an experimental study was conducted. Both the fan’s aerodynamic performance and noise were measured when the two redesigned impellers were compared with the original ones. The test results are discussed in detail and the effect of the noise reduction method for a centrifugal fan using impellers with non-isometric forward-swept blades was analyzed, which can serve as a reference for researches on reduction of fan noise.
MA Jianfeng, QI Datong, MAO Yijun
. Noise reduction for centrifugal fan with non-isometric
forward-swept blade impeller[J]. Frontiers in Energy, 2008
, 2(4)
: 433
-437
.
DOI: 10.1007/s11708-008-0082-6
1. Zhong Fangyuan . Translation of Blade Machinery on Aeroacoustic. Beijing: China Machine Press, 1987 (in Chinese)
2. Lowson M V . Reduction of compressor noise radiation. Journal of the Acoustic Society of America, 1968, 43(1): 37–50. doi:10.1121/1.1910760
3. Mellin R C, Sovran G . Controlling the tonal characteristicsof aerodynamic noise generated by fan rotors. Journal of Basic Engineering (Series D), 1978, 72: 143–154
4. Ewald D, Pavlovic A, Bollinger J G . Noise reduction by applying modulation principles. Journal of the Acoustical Society of America, 1971, 49: 1385. doi: 10.1121/1.1912513
5. Duncan P E, Dawson B . Reduction of interactiontones from axial flow fans by suitable design of rotor configuration. Journal of Sound and Vibration, 1974, 33(2): 143–154. doi:10.1016/S0022-460X(74)80102-1
6. Sun Xiaofeng . The aeroacoustic nature of unequally spaced fan. Journal of Beijing Institute of Aeronautics and Astronautics, 1986, (4): 137–145 (in Chinese)
7. Xu K C . Fan Manual. Beijing: China Machine Press, 1999 (in Chinese)
8. Standardization Administrationof People's Republic of China. GB/T2888-91 ClassificationCompilation of Standards of China, Machinery Volume (20). . Beijing: Standards Press of China, 1993 (in Chinese)
