Author: Drew LandmanPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Experimental Optimization Methods for Multi-element Airfoils
Author: Drew LandmanExperimental Geometry Optimization Techniques for Multi-element Airfoils
Author: Drew LandmanPublisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 542
Book Description
Design and Optimization Method for Multi-element Airfoils
Author: Mark DrelaOptimization of Multi-Element Airfoils
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 75
Book Description
A review of techniques aimed at maximizing C1/Cd and C1 for multi- element airfoils showed the need for more exhaustive testing of possible configurations of flap deflection, slot geometry and airfoil angle of attack. For a typical 4-element airfoil, the number of possible configurations can easily be in the billions. A new technique, based on evolution strategy, has been developed for the problem of optimizing a multi-element airfoil with respect to its envelope of maximum C1/Cd versus C1. This technique was applied to an airfoil having a slotted leading edge flap and a double-slotted trailing edge flap using an existing computer program for 2D subsonic multi-element airfoils to provide values of aerodynamic coefficients. Although limitations of the program precluded the full determination of the envelope of C1/Cd vs C1 the problem of maximizing C1/Cd for a minimum C1 constraint was solved. The result of testing approximately 400 configurations generated by the random mutation- natural selection procedure of evolution strategy was an 8-fold increase in C1/ Cd iwth a 12% increase in C1 over the initial geometry.
Multi-element Airfoil Design by Optimization
Author: Th. E. LabrujèreScientific and Technical Aerospace Reports
Author: STAR
Author: Development of Theoretical Method for Two-Dimensional Multi-Element Airfoil Analysis and Design. Part I: Viscous-Flow Analysis Method
Author: Ishwar C. BhateleyPublisher:
ISBN:
Category :
Languages : en
Pages : 379
Book Description
A method has been developed for the analysis of arbitrary multi-element airfoils in viscous flow. The viscous solution is obtained through an inviscid analysis of an equivalent system defined from viscous considerations. An iterative procedure has been formulated to implement this analysis. The inviscid solution is obtained through a distributed singularity method. A finite-difference method is used to determine boundary-layer characteristics. Methods are included to predict laminar-flow bubbles and separation and transition points. The equivalent airfoil is defined for airfoils with attached flow as well as for airfoils with flow separation. The validity of the method is established through comparison of the predicted results with experimental data for several single- and multi-element airfoils. The comparisons show good agreement for lift coefficient and maximum lift coefficient and fair agreement for drag and pitching moment coefficients. Details of the computer program developed to implement this method are described, including input and output details, FORTRAN source deck listing, and a sample problem. (Author).
Theory and Experiment of Multi-element Airfoils
Author: Ryan CzerwiecMonthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 760
Book Description