Accession Number:

AD0684836

Title:

MEASUREMENT OF THE VELOCITY OF A HIGH-TEMPERATURE GAS IN A BOUNDARY LAYER BY AN ELECTRON-OPTICAL METHOD,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1968-11-21

Pagination or Media Count:

8.0

Abstract:

A contactless determination was made of the velocity field in a gas by suspending minute particles in the gas flow and measuring the particle velocities optically. The procedure is used in the present investigation to measure the distribution of the velocities in a high temperature gas emerging from a cylindrical tube. The gas was hot air from plasmatrons and the tube was water cooled. In the cold air the particles were illuminated with a 500-watt lamp in the hot air, the particles aluminum burned and produced clearly visible tracks. The light from the particles was measured with a photomultiplier and recorded with an oscilloscope. The various errors involved in the apparatus and their sources are discussed briefly. The points obtained in the high temperature current in the turbulent core of the boundary layer practically agree with the isothermal values. The results become difficult to interpret in the immediate vicinity of the wall and further improvement in the procedure decrease in the size of the particles, increase in the sensitivity will be needed to improve the method. Author

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE