naa a22 4500 51076620X CHVBK 20180411083157.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s11630-013-0644-8 doi (NATIONALLICENCE)springer-10.1007/s11630-013-0644-8 Numerical and experimental investigation on aerodynamic performance of small axial flow fan with hollow blade root [Elektronische Daten] [Zhang Li, Yingzi Jin, Dou Huashu, Jin Yuzhen] To reduce the influence of adverse flow conditions at the fan hub and improve fan aerodynamic performance, a modification of conventional axial fan blades with numerical and experimental investigation is presented. Hollow blade root is manufactured near the hub. The numerical and experimental results show that hollow blade root has some effect on the static performance. Static pressure of the modified fan is generally the same with that of the datum fan, while, the efficiency curve of the modified fan has a different trend with that of the datum fan. The highest efficiency of the modified fan is 10% greater than that of the datum fan. The orthogonal experimental results of fan noise show that hollow blade root is a feasible method of reducing fan noise, and the maximum value of noise reduction is about 2 dB. The factors affecting the noise reduction of hollow blade root are in the order of importance as follows: hollow blade margin, hollow blade height and hollow blade width. The much smoother pressure distribution of the modified fan than that of the datum fan is the main mechanism of noise reduction of hollow blade root. The research results will provide the proof of the parameter optimization and the structure design for high performance and low noise small axial fans. Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg, 2013 small axial flow fan nationallicence hollow blade root nationallicence performance nationallicence noise reduction nationallicence mechanism nationallicence Q : air flow rate (kg/s) nationallicence X b : hub ratio nationallicence D : impeller diameter(mm) nationallicence d : hub thickness (mm) nationallicence β : blade stagger angle nationallicence n : rotational speed (r/min) nationallicence P : static pressure (Pa) nationallicence TC : tip clearance nationallicence Q : volume flow rate (m3/s) nationallicence Z : number of impeller blades nationallicence H : hollow blade height(mm) nationallicence K : hollow blade width(mm) nationallicence L : hollow blade margin(mm) nationallicence η : efficiency(%) nationallicence SPL : sound pressure level(dB) nationallicence R : range analysis nationallicence Li Zhang Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China aut Jin Yingzi Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China aut Huashu Dou Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China aut Yuzhen Jin Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China aut Journal of Thermal Science Springer Berlin Heidelberg 22/5(2013-10-01), 424-432 1003-2169 22:5<424 2013 22 11630 https://doi.org/10.1007/s11630-013-0644-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11630-013-0644-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Zhang Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China aut NATIONALLICENCE 700 1- Jin Yingzi Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China aut NATIONALLICENCE 700 1- Huashu Dou Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China aut NATIONALLICENCE 700 1- Yuzhen Jin Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China aut NATIONALLICENCE 773 0- Journal of Thermal Science Springer Berlin Heidelberg 22/5(2013-10-01), 424-432 1003-2169 22:5<424 2013 22 11630 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer