Designing in three dimensions
Abstract
This lecture advocates the direct use of threedimensional flow calculations for turbomachinery design. The limitations of the usual quasithree dimensional approach are discussed and it is shown that fully 3D calculations overcome the modelling limitations inherent in them. Fully 3D calculations also avoid the need to iterate between throughflow and blade to blade calculations. This leads to fewer routine operations (e.g. data transfers) being needed during the design process and hence more efficient use of the designer's time. With a flexible geometrical package, able to generate blade sections and transfer their geometry directly to a 3D data set, changes of stage geometry can be made in minutes. An outline of such a package is given. Modern 3D calculation methods, Ref(11), enable complete stage solutions. with adequate accuracy for design purposes, to be obtained in the order of l hour on a workstation. Hence several design iterations per day can be easily be performed for a single stage of a machine. An example used to design a very high pressure ratio (3:1) axial fan is given and discussed.
 Publication:

In AGARD
 Pub Date:
 May 1994
 Bibcode:
 1994tduc.agar.....D
 Keywords:

 Aircraft Engines;
 Compressor Blades;
 Computational Fluid Dynamics;
 Computer Aided Design;
 Engine Design;
 Three Dimensional Flow;
 Three Dimensional Models;
 Turbomachinery;
 High Pressure;
 Mathematical Models;
 Pressure Distribution;
 Sweep Angle;
 Sweep Effect;
 Velocity Distribution;
 Mechanical Engineering