Blade profiles

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Blade profiles

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► Impeller | Blade properties

[ Axial machines only ]

On tabsheet Profile selection the axial blade profile properties are specified. To this end the profiles have to be selected from the Profile manager.

Profile specification on 1 span position is necessary at least to use the same profile on all spans.

Alternatively on any other span position deviating profiles can be selected resulting in interpolation between different profiles.

Profile selection per span can be activated by selecting the check-box at the beginning of each line.

 

In general, two alternative methods for airfoil design are available:

1. Blade element momentum method

Here either NACA 4 digit or point based profiles can be used. Also an angle of attack α has to be specified, see blade element momentum method.

 

2. Lieblein method

Here only profiles of the NACA 65 series can be used. A solidity l/t has to be specified that has to be between 0.4 and 2.0 on all spans. It is used for the calculation of the skeleton length and stagger angle, see Lieblein method.