National advisory committee for aeronautics Report no. 324. Flight tests on U. S. S. Los Angeles. Part I: Full scale pressuse distribution investigation: by S. J. De France. 33 pages, illustrations, quarto. Washington, Government Printing Office, 1929. Price, fifteen cents

• Publisher: Elsevier Science
• Year: 1930
• Tongue: English
• Weight: 64 KB
• Volume: 209
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(30)91027-7

✦ Synopsis

BOOK REVIEWS. I45

Report No. 322. Investigation of Air Flow in Open-Throat Wind Tunnels by Eastman N. Jacobs. II pages, illustrations, quarto. Washington, Government Printing Office, I929. Price, ten cents. Tests were conducted on the 6-inch wind tunnel of the National Advisory Committee for Aeronautics during May and June, x 928, to form a part of a research on open-throat wind tunnels. The primary object of this part of the research was to study a type of air pulsation which has been encountered in open-throat tunnels, and to find the most satisfactory means of eliminating such pulsations.

In order to do this it was necessary to study the effects of different variables on all of the important characteristics of the tunnel. This paper gives not only the results of the study of air pulsations and methods of eliminating them, but also the effects of changing the exit-cone diameter and flare and the effects of air leakage from the return passage.

It was found that the air pulsations in the 6-inch wind tunnel could be practically eliminated by using a moderately large flare on the exit cone in conjunction with leakage introduced by cutting holes in the exit cone somewhat aft of its minimum diameter.