naa a22 4500 510766293 CHVBK 20180411083157.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s11630-013-0645-7 doi (NATIONALLICENCE)springer-10.1007/s11630-013-0645-7 Influence of diffuser on aerodynamic noise of a forward curved fan [Elektronische Daten] [Soichi Sasaki, Kota Suzuki, Yuta Onomichi, Hidechito Hayashi] In order to clarify the influence of a diffuser on the characteristics of a forward curved fan, the influence of the bare ratio and the outlet angle on the characteristics of the fan were measured through an experiment performed with an actual fan as well as through a numerical simulation, respectively. The mechanism of the discrete frequency noise generated by the separated flow of the diffuser was analyzed. The optimized bare ratio was approximately 17%. The flow separated inside of the diffuser generated discrete frequency noise owing to the interaction between the reversed flow from the diffuser and the impeller rotating at the blade passing frequency. The diffuser outlet angle influenced the pressure ratio more than that by the bare ratio. Furthermore, it was confirmed that restraining the separation in the diffuser effectively decreases the fan noise. Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg, 2013 Pressure Drop nationallicence Fan nationallicence Aerodynamic Noise nationallicence Internal Flow nationallicence Separation nationallicence Sasaki Soichi Division of System Science, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 852-8521, Nagasaki, Japan aut Suzuki Kota Department of Advanced Engineering, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 852-8521, Nagasaki, Japan aut Onomichi Yuta Department of Advanced Engineering, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 852-8521, Nagasaki, Japan aut Hayashi Hidechito Division of System Science, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 852-8521, Nagasaki, Japan aut Journal of Thermal Science Springer Berlin Heidelberg 22/5(2013-10-01), 433-438 1003-2169 22:5<433 2013 22 11630 https://doi.org/10.1007/s11630-013-0645-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11630-013-0645-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sasaki Soichi Division of System Science, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 852-8521, Nagasaki, Japan aut NATIONALLICENCE 700 1- Suzuki Kota Department of Advanced Engineering, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 852-8521, Nagasaki, Japan aut NATIONALLICENCE 700 1- Onomichi Yuta Department of Advanced Engineering, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 852-8521, Nagasaki, Japan aut NATIONALLICENCE 700 1- Hayashi Hidechito Division of System Science, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 852-8521, Nagasaki, Japan aut NATIONALLICENCE 773 0- Journal of Thermal Science Springer Berlin Heidelberg 22/5(2013-10-01), 433-438 1003-2169 22:5<433 2013 22 11630 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer