Abstract
AbstractIn this paper the requirements of a design method are considered, with particular emphasis given to the needs of designers of multi‐stage compressors. It is concluded that what is required is a quasi three‐dimensional compatible design and analysis method. The extension of the finite element blade‐to‐blade method FINSUP to include a design calculation compatible with the analysis calculation is presented. In this method, changes to the blade shape are modelled using a surface transpiration model. By displacing every point on the blade surface individually, the relationship between the blade shape and the surface velocity is determined. It is shown that with a Newton–Raphson procedure adopted in the method, a very efficient manner of introducing the design option is possible. As a consequence the resulting program is fast and completely interactive. An example of the method is shown in which a transonic compressor blade with a suction surface shock is redesigned to give a blade with controlled suction surface diffusion.
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