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S8 Engenharia Aeroespacial |
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Title:
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LAMINAR PROFILE DESIGN THROUGH OPTIMIZATION TECHNIQUES
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Summary :
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ABSTRACT. THE OBJECTIVE OF THE PRESENT WORK IS TO REPORT A METHOD FOR DESIGNING LAMINAR PROFILES USING OPTIMIZATION TECHNIQUES. THE POTENTIAL FLOW OVER AN AIRFOIL IS CALCULATED BY USING A MODIFIED HESS & SMITH METHOD, WHERE A VARIABLE VORTEX DISTRIBUTION ALONG THE AIRFOIL SURFACE IS IMPOSED THROUGH A WEIGHT FUNCTION. THE BOUNDARY LAYER FLOW IS OBTAINED WITH A COMPUTATIONAL CODE, BASED ON THE INTEGRAL EQUATIONS. THIS CODE IS CAPABLE TO CALCULATE LAMINAR AND TURBULENT FLOWS AND THE MICHAEL TRANSITION CRITERIUM IS USED TO DETERMINE THE TRANSITION POINT. THE POTENTIAL AND BOUNDARY LAYER FLOWS ARE COUPLED THROUGH A TRANSPIRATION PROCEDURE, WHICH SIMULATES THE BOUNDARY-LAYER GROWTH ON THE AIRFOIL SURFACE. THE OPTIMIZATION CODE SEARCHES FOR THE AIRFOIL SHAPE, FOR WHICH THE DISTANCE OF THE TRANSITION POINT, FROM THE AIRFOIL LEADING EDGE, IS MAXIMUM. THIS OPTIMIZATION PROCEDURE CAN BE SUBJECTED TO CONSTRAINTS, AS THE SPECIFICATION OF A CERTAIN VALUE FOR THE AIRFOIL INTERNAL VOLUME.
KEY WORDS: LAMINAR PROFILE, OPTIMIZATION TECHNIQUE, PANEL METHOD, VISCOUS-NON-VISCOUS INTERACTION
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Author :
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Girardi, Roberto M.
Paglione, Pedro 0
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Paper View :
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