By W. L. Shields (auth.), John H. Olsen, Arnold Goldburg, Milton Rogers (eds.)

ISBN-10: 1468483463

ISBN-13: 9781468483468

ISBN-10: 146848348X

ISBN-13: 9781468483482

The blend of accelerating airport congestion and the advert vent of huge transports has prompted elevated curiosity in airplane wake turbulence. A quantitative knowing 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 watch over structures. the character of the interplay will depend on either the features of the subsequent airplane and the features of the wake. a few of the inquiries to be spoke back are: What deter mines the total features of the vortex wake? What homes of the subsequent airplane are very important? what's the function of pilot reaction? How are the wake features regarding the genera ting plane parameters? How does the wake crumble and the place? lots of those questions have been addressed at this primary plane Wake Turbulence Symposium subsidized through the Air strength place of work of Sci entific study and The Boeing corporation. staff engaged in aero dynamic learn, airport operations, and device improvement got here from a number of count number ries to offer their effects and trade details. the hot effects from the assembly supply a present photograph of the nation of the data on vortex wakes and their interactions with different plane. Phenomena formerly considered as mere curiosities have emerged as vital instruments for realizing or controlling vortex wakes. the hot sorts of instability happening in the wake may perhaps 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**

**Example text**

TING 38 which in turn can be written as with the aid of eq. (80a) (89) Since \T o (s, t) is the value of V;rrV* in eq. (6) at X(s, t), eq. (89) imposes a compatability condition on the shape of the vor tex line and the prescribed three dimensional flow field. Condition (85) is always fulfilled for two dimensional or axially symmetric problems which are independent of s. , the initial position of the vortex line X(s,o) and the outer flow field, may not fulfill eq. (89). 3. Whether this extended solution will approach the special asymptotic solution fulfilling eq.

5 and 6 demonstrate this point. The motion of a circu1ar vortex ring in a uniform stream U and a doub1et at origin is studied. Without the ring it is a f10w over a sphere of radius a. The Reyno1ds number U aN is 6. 25x104 • The s trength of the vortex ring r is chosen to be ~U Z (0) o a. 5, 1. o For the viscous theory, the velocity components Rand Z are o 0 given by eqs. (40) and (47). The relations hip between C and t given by eq. e. 'T (49) t = 1 - 'TRo IR0 with 'T (0) = 0 2 1(4\)). o For the inviscid theory, R is also ~iven by eq.

H. p, , (9) where hb is the height of the oval. The density p" along the dividing line need not be the same as the average over the whole oval, p', and the difference between p" and p' will depend on the entrainment rate and the internal mixing rate. Hence the rate of change of circulation depends on the "aspect ratio" of the oval, the buoyancy and entrainment, the internal mixing, and the scale of the vortex system. This change in circulation is assumed to affect the wake as though it took place as a decrease in the circulation of the concentrated vortices, although in actuality the vorticity would be distributed over the volume of the wake.

### 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.)

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