Abstract
In this paper, the effect of the outlet surface area of the spiral casing on the performance of a centrifugal fan was investigated using open source CFD software OpenFOAM [1]. An automized loop with RANS and data post-processing is set up using Matlab, for allowing a large number of parameter variations. The effect was analyzed as a function of total pressure loss and static pressure recovery coefficient and on total efficiency as well.
Highlights
A centrifugal fan is widely used machinery in the industry which consists of an impeller in a spiral casing as a typical piece of turbo-machinery that converts external mechanical energy into pressure and kinetic energy of the working fluid
Research on the spiral casing has drawn relatively little attention, but in order to improve the performance of centrifugal fans to an acceptable level, a study of the characteristics of the spiral casing is absolutely needed
The parameters to be modified in this study are alpha spiral angle, α = 12 ÷ 20° and the relative width of the spiral casing B/b2 = 1.4 ÷ 3.0, see Fig. 1
Summary
A centrifugal fan is widely used machinery in the industry which consists of an impeller in a spiral casing as a typical piece of turbo-machinery that converts external mechanical energy into pressure and kinetic energy of the working fluid. Fluids obtain energy from the impeller and it is discharged through the spiral casing. Research on the spiral casing has drawn relatively little attention, but in order to improve the performance of centrifugal fans to an acceptable level, a study of the characteristics of the spiral casing is absolutely needed. R(φ), is the radius of the volute at an angle φ, r2, is the outer radius of the impeller that is equal to 150mm in our case α, is the angle that the absolute velocity vector makes with the peripheral direction tg(α) = cm/cu.
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