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The Effect of Pre-swirl on the Discharge Coefficient of Rotating Axial Orifices

Idris, M. & Pullen, K. R. (2006). The Effect of Pre-swirl on the Discharge Coefficient of Rotating Axial Orifices. Paper presented at the International Conference on Energy and Environment (ICEE 2006), 28-30 Aug 2006, Selangor, Malaysia.


The characteristic of the flow through a set of rotating orifices for particular conditions is quantified in terms of a discharge coefficient which is the ratio of the actual flow divided by the flow for the ideal case. In the present study the pre-swirl was created by having Inlet Guide Vanes (IGVs) at the inlet of the rotating orifices. Pre-swirl changes the angle of attack to the orifice, and thus affects the incidence angle and the discharge coefficient. Pre-swirl improves the discharge coefficient in inclined orifices since it allows the incidence angle to reach zero at a much lower rotational speed than when there is no pre-swirl.

Publication Type: Conference or Workshop Item (Paper)
Publisher Keywords: Pre-swirl, Discharge coefficient, Rotating orifices, Incidence angle
Subjects: T Technology > TJ Mechanical engineering and machinery
Departments: School of Science & Technology > Engineering
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