Handbook of High Speed Photography - IET Labs, Inc.
Handbook of High Speed Photography - IET Labs, Inc.
Handbook of High Speed Photography - IET Labs, Inc.
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
69<br />
Smoke streams in a wind tunnel can be used to show turbulence patlerns. The smoke<br />
is produced by the coking <strong>of</strong> grain straw and is introduced just upstream <strong>of</strong> antiturbulence<br />
screening. It flows with the air stream over and oround the model at speeds<br />
ranging from 15 to 175 ft/sec. Photographs are taken through a transparent section<br />
in the side <strong>of</strong> the wind tunnel. Photograph above shows a propeller rotating at<br />
4080 rpm with blade pitch set for best rale <strong>of</strong> climb and air speed about 45 ft/sec.<br />
Photograph below is <strong>of</strong> a spinning baseball, showing Magnus Effect, which causes ils<br />
path to be curved. Courtesy <strong>of</strong> Pr<strong>of</strong>essor F. N. M. Brown, University <strong>of</strong> Notre Dame.
Change language