Aerodynamics for Engineering Students by E. L. Houghton, P. W. Carpenter, Steven H. Collicott Ph.D.

By E. L. Houghton, P. W. Carpenter, Steven H. Collicott Ph.D. Stanford University Aeronautics & Astronautics, Daniel T. Valentine Ph.D.

"The ebook is obviously written and will be with a bit of luck advised as a basic and accomplished aerodynamics textual content for using scholars of aeronautical engineering.Journal of Aerospace Engineering.... a beneficial textual content for the undergraduate no longer least as a result of wide use of good annotated examples and the extensive diversity of subject matters covered.The Aeronautical magazine.

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A theoretical guide is helpful in achieving this end, and it is in this direction that dimensional analysis is of use. 19 20 Aerodynamics for Engineering Students In the above problem the frequency of eddies, n, will depend primarily on: (i) (ii) (iii) (iv) the size of the cylinder, represented by its diameter, d the speed of the stream, V the density of the fluid, p the kinematic viscosity of the fluid, u. It should be noted that either p or u may be used to represent the viscosity of the fluid.

Kcp of the chord Then, taking moments about the leading edge: M~~=M~~-(Lco~a+Dsina)x*c=-(Lcosa+Dsin~)kcpc Dividing this by pV2Sc, it becomes CM, - (CLcos Q XAC + CDsin a )= -(CLcos a + CDsin a ) k c p C giving XAC k c p = -- c CMAC CLcosa+Cgsina Fig. 55) At first sight this would suggest that kCp is always less than XAC/C. However, CM, is almost invariably negative, so that in fact kcp is numerically greater than XAC/C and the centre of pressure is behind the aerodynamic centre. 4, plot a curve showing the approximate variation of the position of centre of pressure with lift coefficient, for lift coefficients between zero and unity.

The same reduction occurs in a,. Thus a cambered section has the same value of C L as does its thickness distribution, but this occurs at a smaller incidence. Modern, thin, sharp-nosed sections display a slightly different characteristic to the above, as shown in Fig. 24. In this case, the lift curve has two approximately straight portions, of different slopes. The slope of the lower portion is almost the same as that for a thicker section but, at a moderate incidence, the slope takes a different, smaller value, leading to a smaller value of CL, typically of the order of unity.

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