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Abstract:
Oscillation of fuel composition in ducted air flows with oscillatory injection of gaseous fuel was studied using temperature difference as scalar in flows involving radial injection of an oscillatory fuel jet and radial and axial injection of a steady air-fuel jet with oscillatory fuel composition into a ducted air stream. Local measurements of mean and oscillatory velocity and scalar in turbulent flow were carried out with flow rates, frequency and amplitude of imposed oscillations as variables. The decay of the oscillation of the scalar was faster than that of mean velocity and mean scalar, and attenuation was strongest in the shear layer. Flow past a bend attenuated oscillations by around 40% and past a bluff-body downstream of a jet resulted in faster decay of oscillations than in flows without a bluff-body. The influences of frequency in the range between 100 and 200 Hz and mass flow ratio of cross flow to jet between 5 and 15 on attenuation of oscillations was small. Active Control, Torpedo
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Professional paper |
| Pages: |
6 |
| Report Date: |
AUG 1992 |
| Report Number: |
A199862 |
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