An Inverse Approach For Airfoil Design
Author(s)
M. T. Rahmati, G. A. Aggidis & M. Zangeneh
Abstract
Inverse design methods directly compute geometry for specified design
parameters such as surface pressure or velocity, which is related to the
performance of an airfoil (or a blade) geometry. These methods replace the time
consuming iterative procedure of direct methods in which a large number of
different blade shapes are designed and analysed to find the one which creates
the surface velocity or pressure distribution closest to the desired one. In this
paper a viscous inverse method for airfoil design is described. The inverse design
approach computes an airfoil shape based on the target surface pressure
distribution. The re-design of an airfoil, starting from an initial arbitrary profile
in subsonic flow regimes, demonstrates the merits and robustness of this
approach.
Keywords: inverse method, CFD, airfoil design, RANS equations.
1 Introduction
The Computational Fluid Dynamics (CFD) codes can be directly used for airfoil
shape design based on ‘trial and error’ approaches. By guessing an airfoil shape,
the flow solution can be obtained using the CFD codes. The flow solution is then
compared with the desired flow conditions. If these are not met then the airfoil
geometry is altered. The whole process is repeated again, until the required flow
conditions are achieved. In fact, these direct design procedures are very
inefficient and time consuming. In order to reduce the development and design
time and their associated costs, a more systematic method is required. The
inverse method is an alternative approach that replaces the time consuming
iterative procedure of direct methods. A pioneering airfoil inverse method based
on conformal mapping was developed by Lighthill [1] in 1945. Since then many
inverse methods for airfoil (or blade) design have been developed. These
Keywords
inverse method, CFD, airfoil design, RANS equations.
Related Book
Other papers in this volume
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