Turbulence Structure of Mixing Swirling Flows.
Annual rept.1 Oct 86-30 Sep 87,
WASHINGTON UNIV SEATTLE DEPT OF AERONAUTICS AND ASTRONAUTICS
Pagination or Media Count:
Modifications to the swirling jet flow facility and mean flow data taken in the initial mixing region are described. Measurements are made at six streamwise locations downstream of the nozzle exit for three different initial mass flow rate ratios. The data were analyzed in order to calculate static pressure profiles, total and component velocity profiles, and local wall shear stress values. The results show that an axially-directed outer stream inhibits the spreading rate of the swirling inner stream and the decay of the swirl within that stream. The results also show that near-wall similarity exists in flow near the centerbody, so that the two dimensional form of the law-of -the-wall, when applied to the total velocity, can serve as a valid wall function for prediction purposes. Keywords Turbulent jets, Mixing, Turbulence structure.
- Fluid Mechanics