Abstract
A tool to create parametric aerodynamic shapes using intuitive design variables based on class shape transformation (CST) curves is presented. To enable this, a system has been developed which accepts arbitrary constraints and automatically derives the analytical expressions which describe the corresponding class shape transformation curves. Parametric geometry definitions for fan cowl and intake aero-lines were developed using the generalized method. Computational fluid dynamics (CFD) analysis of the fan cowl shows that despite the simple geometry definition, its performance characteristics are close to what would be expected of a finished design. The intake geometry was generated in a similar way and met the typical performance metrics for conventional intakes. This demonstrates the usefulness of the tool to quickly and robustly produce parametric aero-lines with good aerodynamic properties, using relatively simple intuitive design variables.
Highlights
External aerodynamic shapes can be represented in a number of ways
The intuitiveness of the parameterization method for airfoil sections (PARSEC) [6] was combined with the highly flexible Class shape transformation (CST) parameterization method. This intuitive CST approach is a transformation of the CST parameterization method to a full set of intuitive parameters by a transformation matrix [5]
Nacelle drag characteristics are investigated through 2D axisymmetric Computational Fluid Dynamics (CFD), while the intake performance is assessed at high incidence with 3D CFD
Summary
External aerodynamic shapes can be represented in a number of ways. The most basic approach is to construct the shape from a point cloud. This method is capable of producing a wide range of aerodynamic shapes including intake and fan cowl aero-lines [3] in a universal way with a small number of design variables. Details of the CFD methods and aerodynamic performance metrics used to assess fan cowl and intake parametric geometries are presented.
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