Abstract: A numerical analysis method
has been developed for the prediction of the flow in a
cross-flow fan with a casing. The method has no simplifying
assumptions regarding the geometry of both the impeller blades
and the casing. Taking into consideration the effect of the
boundary layer on the upper wall surface of the casing, the
internal flow is analyzed using both the direct boundary element
method and the discrete vortex method by assuming that the flow
is two-dimensional, inviscid and incompressible. In order to
satisfy Kelven's theorem, vorticity is shed at the trailing
edges of each impeller blade, then the discrete vortex method is
used to approximate the convection of the free vorticity.
Results are given for the cross-flow fan with two different
configurations of the casing with an identical impeller.
Key words:
Cross-flow fan Unsteady flow
Manuscript received on
September 3, 1994
|