B-29 Superfortress in action by Larry Davis, Joe Sewell, Don Greer

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By Larry Davis, Joe Sewell, Don Greer

B-29 Superfortress in motion КНИГИ ;ВОЕННАЯ ИСТОРИЯ Издательство: Squadron/Signal publicationsСерия: airplane 165Автор(ы): Larry DavisЯзык: EnglishГод издания: 1987Количество страниц: 60ISBN: 0-89747-370-1Формат: pdf (96 dpi) 1280x9500Размер: 16.9 mbRapid 17

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For ducts having D / D e these results can be corrected by a multiplication factor of A/A e , Computations of (pt/Pa^min and (Pe/Pa^min wtlich appear in Table 4 were computed by the methods just outlined. Note that the computed values of the performance parameters listed underestimate the measured values by rather large amounts. 2. Second-Throat Type Diffusers The performance data of configurations 2 and 3 are plotted in Figs. 11-12 and 13-15. Although the general trends of all these performance curves are similar, there are significant differences in the magnitudes of p e /p a , p^/Pa* the amount of hysteresis, and the minimum starting and operating regions.

35 Purchased from American Institute of Aeronautics and Astronautics LIQUID ROCKETS AND PROPELLANTS NOMENCLATURE a = length of cavity following nozzle exit plane, in0 p A = area, in. ^ D = diameter, in. 2 ft/sec ey h = enthalpy, Btu/lb J = constant, 778 ft-lb/Btu K = coefficient in weight flow equation (see Appendix A) L = axial length, in. m = molecular weight, Ib/lb mole M = Mach number p = static or total pressure, psia R = gas constant, ft-lb/lb°R T = static or total temperature, °R v = velocity, ft/sec V = volume, ft 3 .

Procedure (2) is Recommended because this method is not highly dependent onthe response time of the manometer pressure lines» A definite change in the tonal quality of the noise emitted by the diffuser exhaust jet was found to occur when the diffuser started and the nozzle began to flow full; but this tonal change is not recommended as a good criterion for judging precisely when the nozzle begins to, or ceases to, flow full. The minimum operating total pressure was determined by starting the diffuser at a high total pressure so that the nozzle was definitely flowing full, and then reducing total pressure, which is the reverse procedure to that outlined in method (1) above.

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