Calculation of the Wakes of Three Transport Aircraft in Holding, Takeoff, and Landing Configurations and Comparison with Experimental Measurements

摘要

A method is described for the calculation of the initial form and location of the inviscid rolled-up wake vortices behind wings having both simple and complex load distributions such as those which occur when the wing is highly flapped. The method makes use of the Betz theorems of conservation of vorticity and moments of vorticity in the wake. It is found that a simple relationship exists between the radial distribution of vorticity concentrated in the wake vortices and the spanwise distribution of vorticity shed from the wing. Two types of mutually induced motions of the trailing vortices are discussed in the light of their possible effect on the ultimate stability and decay of the wake. (Modified author abstract)