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Unformatted text preview: Aerodynamic Loading of a Turbine Blade Supplement to Project 1 ME 452 Fall 2011 Turbine blades are airfoils that rotate. The interaction of the air on these airfoils causes distributed forces that urge the turbine to rotate, but also load the blades in the axial direction. Figure 1 below shows the nature of the distributed loading of the air on turbine blades. For the stress analysis of the blades, and for the performance analysis of the overall turbine, we need to know the aerodynamic forces in the axial direction of the turbine, and in the tangential direction of rotation. Because we only need the effect of these distributed forces on at the root of the turbine blade, it is expedient to replace these distributed forces with point loads at the center of pressure, cp, on each blade. These forces we will call F thrust and F tang . The center of pressure is located distance L p from the axis of rotation, and is offset axially a distance, e, from the centerline of the blade Figure 1. Distributed forces of air flow on turbine blades....
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This document was uploaded on 12/28/2011.
- Fall '09