THERMAL SCIENCE
International Scientific Journal
LOW-PRESSURE REVERSIBLE AXIAL FAN WITH STRAIGHT PROFILE BLADES AND RELATIVELY HIGH EFFICIENCY
ABSTRACT
The paper presents the design and operating characteristics of a model of reversible axial fan with only one impeller, whose reversibility is achieved by changing the direction of rotation. The fan is designed for the purpose of providing alternating air circulation in wood dryers in order to reduce the consumption of electricity for the fan and increase energy efficiency of the entire dryer. To satisfy the reversibility of flow, the shape of the blade profile is symmetrical along the longitudinal and transversal axes of the profile. The fan is designed with equal specific work of all elementary stages, using the method of lift forces. The impeller blades have straight mean line profiles. The shape of the blade profile was adopted after the numerical simulations were carried out and high efficiency was achieved. Based on the calculation and conducted numerical simulations, a physical model of the fan was created and tested on a standard test rig, with air loading at the suction side of the fan. The operating characteristics are shown for different blade angles. The obtained maximum efficiency was around 0.65, which represents a rather high value for axial fans with straight profile blades.
KEYWORDS
PAPER SUBMITTED: 2012-05-03
PAPER REVISED: 2012-09-20
PAPER ACCEPTED: 2012-09-25
THERMAL SCIENCE YEAR
2012, VOLUME
16, ISSUE
Supplement 2, PAGES [S593 - S603]
- Bogdanović B., et al., The Development Construction of Reversible Axial Fans (in Serbian), Report for project No. 18012, funded by the Ministry of Science and Technological Development, the period: 31.04.2008-31.04.2011.
- Spasić Ž., Numerical and Experimental Investigation of the Influence of the Blade Profile Shape on the Reversible Axial Fan Characteristics (in Serbian), Ph. D. thesis, Faculty of Mechanical Engineering Nis, University of Nis, Nis, 2012.
- Еck B., Fans-Design and Operation of centrifugal, axial-flow and cross-flow fans, Pergamont Press, Oxford, England, 1973.
- Krsmanović LJ, Gajić A, Turbomachinery - Fans, (in Serbian), Faculty of Mechanical Engineering, University of Belgrade, Belgrade, 2000.
- Spasić Ž., Bogdanović B., M. Radić., Variation of operation of low-pressure reversible axial fans driven by induction motor from start to the steady-stat, Proceedings on CD (SIMTERM 2011, Sokobanja, 18- 21 X 2011) pp. 586-595.
- Bogdanović B., Milenković D., Bogdanović-Jovanović J., Fans-performance and operating characteristics (in Serbian) Faculty of Mechanical Engineering Nis, 2012.