By W. L. Shields (auth.), John H. Olsen, Arnold Goldburg, Milton Rogers (eds.)
The blend of accelerating airport congestion and the advert vent of huge transports has brought on elevated curiosity in plane wake turbulence. A quantitative figuring out of the interplay among an airplane and the vortex wake of a previous plane is critical for making plans destiny excessive density air site visitors styles and keep an eye on platforms. the character of the interplay depends upon either the features of the next airplane and the features of the wake. the various inquiries to be replied are: What deter mines the whole features of the vortex wake? What houses of the subsequent airplane are very important? what's the function of pilot reaction? How are the wake features with regards to the genera ting plane parameters? How does the wake fall apart and the place? lots of those questions have been addressed at this primary plane Wake Turbulence Symposium backed by means of the Air strength place of work of Sci entific study and The Boeing corporation. employees engaged in aero dynamic learn, airport operations, and tool improvement got here from numerous count number ries to provide their effects and trade info. the recent effects from the assembly offer a present photo of the country 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 realizing or controlling vortex wakes. the hot varieties of instability happening in the wake may possibly sooner or later be used for selling early dis integration of the harmful 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
Since eq. (78) does not contain any viscous term exp1icit1y, the velocity of the vortex 1ine given in the present analysis will agree with inviscid theory for each instant provided the same vorticity distribution is assurned for the inviscid theory. Present analysis yie1ds the correct time his tory of the vorticity diffusion Whi~h- the inviscid t:leory fai to do. 3 Condition of Compatibility It should be noted that eq. ,(! )=0. boundary condition of w(l)=O at ;=0, it follow~rthat ws(l) = ° for all r and With the ~(s,t) = sS(t)/S(o).
Fluid within the nearly elliptical cylinder marked by the dashed lines is assumed to be convected together with the vortices, as in the potential flow solution,6 hence the dashed line is a streamline separating the flow field into two regions: the external atmosphere (whose properties are represented by p and T), and the fluid accompanying the vortices (with average properties p' and T'). Since 43 VORTEX WAKE IN A STABLY STRATIFIED ATMOSPHERE the vortices entrain the ambient air, this separation cannot hold rigorously, but it seems a reasonable approximation if the entrainment rate and the des cent velocity of the vortex system are suffieiently slow so that, at any particular instant, a near equilibrium state exists and the elliptieal shape holds.
It is instructive to consider some representative ways in which p" could vary as the wake descends. One extreme sample of possible behavior is the case with ~z = 0, which would occur if the internal mixing was sufficiently weak so that the entrained fluid was still at ambient density along the dividing plane, and thus circulation would remain constant as the wake descended. 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.
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.)