Accession Number:

AD0673388

Title:

INVESTIGATION OF THE MICROSTRUCTURE OF A TURBULENT JET IN A WAKE (ISSLEDOVANIE MIKROSTRUKTURY TURBULENTNOI STRUI V SPUTNOM POTOKE),

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1967-09-14

Pagination or Media Count:

21.0

Abstract:

The microstructure of the main part of an axisymmetric turbulent jet in a wake flow is investigated experimentally over a wide range of the wake parameter m u sub deltau sub 0 0.04, 0.21, 0.4, 0.52, where u sub delta - is the velocity of wake flow and u sub 0 is the mean velocity at the nozzle exit. Measurements were made with Disa Elektronik apparatus a constant-temperature anemometer, including two amplifiers and a correlator. The velocity profiles of three components of fluctuating velocity and Reynolds stress were measured in the main part of the jet. The values of the mean velocity and two components of fluctuating velocity were measured at a large number of points on the jet axis. The measured profiles of Reynolds stress are compared with corresponding profiles calculated from an experimentally determined mean velocity profile by means of turbulent boundary layer equations. The correlation coefficient of longitudinal components of fluctuating velocity in one section of the jet was measured for two values of m and the variation of the integral scale of turbulence across the jet was determined. The results obtained here illustrate the effect of the parameter m on the characteristics of a turbulent jet in wake flow. Author

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE