The jet axial velocity field exiting from a nozzle/chamber configuration with an expansion ratio of 5 is investigated using Stereo-PIV for a range of chamber lengths and Reynolds (Re) numbers. The jet can exit the chamber in axial jet (AJ) mode with the maximum velocity near the chamber axis or precessing jet (PJ) mode with the maximum velocity near the chamber wall and rotating or precessing about the chamber axis. Algorithms were developed to determine the jet mode from exit conditions and allow conditional averaging of the velocity field in PJ mode. The probability of the jet in PJ mode was found to be a strong function of chamber length, L/D and only a mild function of Re for Re > 10,000. High precession probability was found for chambers of length in the range 2 < L/D < 2.75 for all cases for Re > 10,000. An abrupt reduction in precession probability occurred for chamber lengths L/D~3. For increasing chamber lengths, an increase in precession probability was observed. The ratio of entrainment-into-the-chamber of surrounding fluid to jet exit fluid was found not to be a function of Re or jet mode (AJ or PJ) but only a function of L/D. A maximum ratio entrainment-into-the-chamber was observed to occur in the range 2 < L/D < 2.5. Conditionally averaged velocity profiles also showed the exiting jet to be a strong function of L/D and with only a mild effect of Re for all cases of Re > 10,000.
Experiments in Fluids – Springer Journals
Published: Aug 6, 2011
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