Abstract

Design theory for cross flow fans is not established well in general, although it is widely used for home and office appliances. An equation concerning aerodynamic characteristics of cross flow fans is derived here based on Euler's pressure equation. This equation contains, however, an unknown parameter which cannot be determined easily by theoretical analysis. New flow visualization technique in water is developed using the surface tension modifier as the tracer, in order to overcome this difficulty and analyze the characteristics of the parameter experimentally for wide flow range. Certain relation between the unknown parameter and the fan configuration is obtained, which would contribute to the improvement of modeling of the flow field in cross flow fans.

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