By W. L. Shields (auth.), John H. Olsen, Arnold Goldburg, Milton Rogers (eds.)
The mix of accelerating airport congestion and the advert vent of enormous transports has triggered elevated curiosity in plane wake turbulence. A quantitative figuring out of the interplay among an plane and the vortex wake of a previous plane is critical for making plans destiny excessive density air site visitors styles and keep watch over structures. the character of the interplay relies on either the features of the subsequent plane and the features of the wake. a few of the inquiries to be spoke back are: What deter mines the whole features of the vortex wake? What houses of the next plane are vital? what's the function of pilot reaction? How are the wake features on the topic of the genera ting airplane parameters? How does the wake collapse and the place? a lot of those questions have been addressed at this primary airplane Wake Turbulence Symposium subsidized via the Air strength workplace of Sci entific learn and The Boeing corporation. employees engaged in aero dynamic examine, airport operations, and device improvement got here from a number of count number ries to provide their effects and trade info. the hot effects from the assembly offer a present photo of the nation of the information on vortex wakes and their interactions with different plane. Phenomena formerly considered as mere curiosities have emerged as very important instruments for knowing or controlling vortex wakes. the hot different types of instability taking place in the wake may well someday be used for selling early dis integration of the dangerous dual vortex structure.
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Additional resources for Aircraft Wake Turbulence and Its Detection: Proceedings of a Symposium on Aircraft Wake Turbulence held in Seattle, Washington, September 1–3, 1970. Sponsored jointly by the Flight Sciences Laboratory, Boeing Scientific Research Laboratories and the Air F
Some manipulation of Eq. (5) gives then the mass conservation equation as dF dt -= - (7) GVw assuming again that density changes are small over the distance traveled. When the vortex system has acquired buoyancy, the circulation about each vortex is altered by the buoyancy. The circulation equation for inhomogeneous fluids (the Bjerkness equation) is 9 dr dt =- (8) where C is the contour along which the circulation is computed. For the present application, take C as shown in Fig. 2, so that legs 1 through 3 are entirely in the ambient atmosphere and leg 4 bisects the oval along the line of symmetry between the vortices.
There would still be VORTEX WAKE IN A STABLY STRATIFIED ATMOSPHERE 47 some buoyancy though because, although 6z = 0 implies that p", the density along the dividing plane, will be equal to the local ambient density p, it is likely that the mean internal density p' will still be less than p. If 6z is greater than zero, then there is mixing between the entrained fluid and the buoyant fluid already within the oval and thus pI' is less than the ambient density. As will be shown later, an increase in 6z also corresponds to an increased entrainment rate, which would be expected to follow from the increased mixing.
1) and the operator , <>13 "11 o"lk (*) = [Cf Id? + (l/r)d/dr - (1/I'")]. , 11(1) k \ t, t, r) ~ and eq. where Atc (r, t j fur k=1,2 (58) (57) becomes As =A1 a power _ k - ( - 1 ) VR (t, t) and . ser~es, are separation constants. By representing 1\ as -A " aknr -2n , t he d'~ ff erent~a . 1 equat~on . f or --k A. an d r ~ ~ the boundary co~dition at r=O yield the conditions for nontrivial solution, and A = 3 Due to the separation of variables, the only inhomogeneous boundary condition, eq. (55c), can be split as r ....
Aircraft Wake Turbulence and Its Detection: Proceedings of a Symposium on Aircraft Wake Turbulence held in Seattle, Washington, September 1–3, 1970. Sponsored jointly by the Flight Sciences Laboratory, Boeing Scientific Research Laboratories and the Air F by W. L. Shields (auth.), John H. Olsen, Arnold Goldburg, Milton Rogers (eds.)