Publisher's Synopsis
Excerpt from Air Forces on Circular Cylinders, Axes Normal to the Wind, With Special Reference to the Law of Dynamical Similarity: A Dissertation Submitted to the Board of University Studies of the Johns Hopkins University in Conformity With the Requirements for the Degree of Doctor of Philosophy
One of the pressing problems of theoretical as well as practical interest in present day aerodynamics is the proper means of passing from results obtained on small models in a wind tunnel to results valid for the full scale body. Much work has been done of an empirical nature on aerofoils and forms directly suited for practical use, but so far no ex tensive investigation has been made of air forces on a body of simple geometrical form over a large range, so that the suggested laws might be tested. The object of the present investigation was to test the validity of the law of dimeh sional similarity, proposed a long time ago by Lord Rayleigh: over a wider range than has heretofore been done, using as models circular cylinders with their axes normal to the wind.
Lord Rayleigh showed that under the assumptions usually made the force of a current of air upon a solid body may be expressed as Cvz, f being the density of the air, 8 the area of the solid projected on a plane normal to the Wind.
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