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<< Click to Display Table of Contents >> Francis Turbine |
  
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<< Click to Display Table of Contents >> Francis Turbine |
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► Runner | Main dimensions 
The Main Dimensions menu item is used to define main dimensions of the runner. Main Dimensions are forming the most important basis for all following design steps.
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The real flow in a Francis turbine runner is turbulent and three-dimensional. Secondary flows, separation and reattachment in boundary layers, transient recirculation areas and other features may occur. Nevertheless it is useful - and it is common practice in the turbine design theory - to simplify the realistic flow applying representative streamlines for the first design approach. Employing 1D-streamline theory the following cross sections are significant in particular: •inlet (index 1) •outlet (index 2)
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The design of the main dimensions has to be made in a strict order. This will be secured by the following: One step within the design has to be finished completely before the next can be accomplished. That is to say, the changeability of a tab sheet will be disabled by CFturbo until all necessary parameters have been specified.
