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Download Macmillan Encyclopedia of Energy (3 Volume Set) by John Zumerchik PDF

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By John Zumerchik

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These wing tip vortices are like minitornadoes that reach out and alter the pressure distribution over the wing surface so as to increase its component in the drag direction. This increase in drag is called induced drag; it is simply another source of pressure drag on the body. Finally, we note that if the body is moving at speeds near and above the speed of sound (transonic and supersonic speeds), shock waves will occur that increase the pressure on the front portions of the body, contributing an additional source of pressure drag called wave drag.

1, Swedish National Science Research Council, Stockholm. Arlington, VA, Translation Consultants Ltd. Schindler, D. ; Mills, K. ; Malley, D. ; Findlay, D. ; Davies, I. ; Turner, M. ; Linsey, G. ; Cruikshank, D. R. (1985). ” Science 228:1395–1401. Smith, R. A. (1872). Air and Rain: The Beginnings of a Chemical Climatology. London: Longmans Greene. eoe A 10/22/02 8:55 AM Page 7 A ACOUSTICAL ENERGY See: Waves ADVANCED TRAFFIC MANAGEMENT SYSTEMS See: Traffic Flow Management AERODYNAMICS The next time you hear an airplane flying overhead, look up, and pause for a moment.

This curling motion, superimposed on the main freestream velocity, produces a vortex at each wing tip, that trails downstream of the wing. These wing tip vortices are like minitornadoes that reach out and alter the pressure distribution over the wing surface so as to increase its component in the drag direction. This increase in drag is called induced drag; it is simply another source of pressure drag on the body. Finally, we note that if the body is moving at speeds near and above the speed of sound (transonic and supersonic speeds), shock waves will occur that increase the pressure on the front portions of the body, contributing an additional source of pressure drag called wave drag.

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