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http://dx.doi.org/10.5293/IJFMS.2012.5.3.117

Aspect-Ratio Effects and Unsteady Pressure Measurements inside a Cross-Flow Impeller  

Hirata, Katsuya (Department of Mechanical Engineering, Doshisha University)
Onishi, Yusuke (Department of Mechanical Engineering, Doshisha University)
Nagasaka, Shigeya (Department of Mechanical Engineering, Doshisha University)
Matsumoto, Ryo (Department of Mechanical Engineering, Doshisha University)
Funaki, Jiro (Department of Mechanical Engineering, Doshisha University)
Publication Information
International Journal of Fluid Machinery and Systems / v.5, no.3, 2012 , pp. 117-125 More about this Journal
Abstract
In the present experimental study, the authors try to clarify the characteristics of the flow around and inside a cross-flow impeller in a typical geometry, over a wide parameter range of an aspect ratio $L/D_2$. In order to eliminate the complicated casing factors, the impeller rotates in open space without any casings. As a result, by using hot wire anemometer measurements and by conventional flow visualisations with a particle image velocimetry technique, the authors show that both the outflow rate and the maximum vorticity attain the maximum for $L/D_2$ = 0.6. In order to investigate the aspect-ratio effect, we further reveal minute fluctuating pressures on an impeller end wall for a singular $L/D_2$ = 0.6. Especially in these pressure measurements, the eccentric vortex is prevented to revolute by the insertion of a tongue, in order to consider the spatial structure of flow more precisely.
Keywords
Cross-Flow Fan; Blower; Fan; Aspect Ratio; Pressure Measurement;
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