Characteristics of an Airfoil Extending Through a Circular Jet

Author: Rethorst, Scott Carson

Year: 1956

Degree: Dissertation (Ph.D.)

Advisor: Stewart, Homer Joseph

Committee Member: Unknown, Unknown

Option: Aeronautics; Mathematics

DOI: 10.7907/7PS7-T859

Abstract

A method has been derived for the determination of the downwash in the field of an airfoil extending through a circular jet. This solution has been applied particularly to the region aft of the lifting line in the plane of the airfoil, to determine the lift distribution on a wing extending through a circular jet.

The method of solution is essentially based on a division of the flow induced by the jet boundary into parts which are even and odd with respect to the direction of flow. The analysis due to the even part alone is similar to previous theories, which in effect disregarded the odd part. Such previous results based on the even part alone differ considerably from the experimental values. The results based on the total of the even and odd parts show good agreement with the experiments, illustrating the necessity of including the odd part of the flow when the segment of the wing immersed in the jet is of low aspect ratio.

The problem has been solved in parametric form, so that the results may be employed to determine the characteristics of any geometry wing-jet combination at any jet velocity ratio.

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