TY - GEN
T1 - A preliminary analysis on the vortical structure of a coaxial geometry with a central lobed nozzle
AU - Yu, S. C.M.
AU - Low, S. C.
N1 - Publisher Copyright:
Copyright © 1997 by ASME.
PY - 1997
Y1 - 1997
N2 - The vortical structure of the turbulent, confined, coaxial geometry with a central lobe forced mixer have been determined by measurements using a two-component fibre-optic laser-Doppler anemometer at a Reynolds number of 5.1 × 104 (based on the baseline circular nozzle diameter, Di = 30 mm, and bulk mean velocity, U?" of the two streams at 1.7 m/s). Ratios of the annular mean to the core mean velocity (X) were kept at 0.4, 1.1 and 2.0 respectively. Results showed that the mixing processes were greatly enhanced by the formation and interactions of the normal and streamwise vorticity. In particular, the deformation and the subsequent stretching of the normal vortices shed at the nozzle walls by the streamwise vortices played a crucial role in the mixing processes. The higher speed stream appeared to determine the form of mixing downstream. For all the cases considered, strength of the streamwise vorticity were dissipated within 6D1 from the nozzle exit plane.
AB - The vortical structure of the turbulent, confined, coaxial geometry with a central lobe forced mixer have been determined by measurements using a two-component fibre-optic laser-Doppler anemometer at a Reynolds number of 5.1 × 104 (based on the baseline circular nozzle diameter, Di = 30 mm, and bulk mean velocity, U?" of the two streams at 1.7 m/s). Ratios of the annular mean to the core mean velocity (X) were kept at 0.4, 1.1 and 2.0 respectively. Results showed that the mixing processes were greatly enhanced by the formation and interactions of the normal and streamwise vorticity. In particular, the deformation and the subsequent stretching of the normal vortices shed at the nozzle walls by the streamwise vortices played a crucial role in the mixing processes. The higher speed stream appeared to determine the form of mixing downstream. For all the cases considered, strength of the streamwise vorticity were dissipated within 6D1 from the nozzle exit plane.
UR - http://www.scopus.com/inward/record.url?scp=84928501182&partnerID=8YFLogxK
U2 - 10.1115/97-AA-112
DO - 10.1115/97-AA-112
M3 - Conference article published in proceeding or book
AN - SCOPUS:84928501182
T3 - Proceedings of the ASME Turbo Expo
BT - ASME 1997 Turbo Asia Conference, TA 1997
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 1997 Turbo Asia Conference, TA 1997
Y2 - 30 September 1997 through 2 October 1997
ER -