Download Aircraft of the Chaco War 1928-1935 by Antonio L. Sapienza PDF

By Antonio L. Sapienza

Greater than one hundred fifty by no means prior to released illustrations, complimented by means of an exhaustively researched textual content, rfile the little-known air conflict among Bolivia and Paraguay through the overdue Nineteen Twenties and early Thirties. complete info of such plane as Fiat C.R. 20s, Curtiss Hawk IIs, Curtiss Ospreys, Potez 25s and all different varieties hired by way of either warring parties, together with acquisition, operations, and markings make this a needs to for historians, modelers, and somebody drawn to golden-age aviation.

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4 DIMENSIONAL CONSIDERATIONS Based on our previous experience with plane and circular jets we could write : urn = f l ( M 0 , P , r) [ 3-22] 54 [ 3-23] b = f2(Mo, P , r ) where M o is the momentum flux in the radial direction. Using the r-theorem, we could reduce [ 3-22] to: u r n / d w = constantC1 or:% = [ 3-24] 1 +aJ-- UO r/ro r/bo [ 3-25] where ro is the radius of the discs and b o is half the width between the discs from which the radial jet emerges. 5 G O E R T L E R - T Y P E SOLUTION Following Schwarz (1963), we will make the constant eddy-viscosity assumption and develop a Goertler-type solution for the velocity distribution in the radial jet.

1-2, where it is also compared with the theoretical curve of Tollmien. Further careful measurements on the plane jet have been made by Albertson et al. (1950), Zijnen (1958a), Heskestad (1965) and others. Zijnen’s experimental results are compared with the theoretical curves of Tollmien and Goertler in Fig. 1-5. ) We find that near the axis of the jet, the Goertler solution appears to be slightly superior, whereas in the outer region the Tollmien solution is generally preferred. It has been experimentally found that the velocity distribution could also be represented satisfactorily by a Gaussian curve.

In view of the uncertainty involved in its precise location, for practical purposes, the virtual origin could be located at the nozzle itself, and as a result the distance from the nozzle I becomes identical with x . 10. 67. Newman (1961) has reported that the above value is satisfactory for large values of x/bo but for smaller values of xlb,, u has been found t o be as large as 12. 12/J(I From their experiments, Albertson et al. 1 (b) Fig. 1-6. Mixing length and kinematic eddy viscosity for plane turbulent free jets (Zijnen, 1958a).

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