Prediction of Flow Outlet Angle in Blade Rows With Conical Stream Surfaces

Turbine stages for large volume flows, which simultaneously operate with a considerable change in density, are geometrically designed in such a way that the flow is necessarily associated with pronounced radial movement. Under such conditions the methods used hitherto for prediction of the flow outlet angle from blade rows are not dependable. The present paper deals with this problem theoretically, assuming rotational symmetry and conical flow surfaces. It is found that rotation of the blading influences the process, i.e., a row of rotating blading has rather different deflection properties than a geometrically congruent stationary row.