Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. (From -To) REPORT DATE (DD-MM-YYYY) 04-15-2012 REPORT TYPE Technical Paper DATES COVERED SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Air Force Research Laboratory (AFMC) AFRL/RQR SPONSOR/MONITOR'S Pollux Drive NUMBER(S)Edwards AFB CA 93524-7048 AFRL-RZ-ED-TP-2012-112 DISTRIBUTION / AVAILABILITY STATEMENTDistribution A: Approved for public release; distribution unlimited. PA Clearance # 12260 SUPPLEMENTARY NOTESFor presentation at the 12th Triennial International Conference on Liquid Atomization and Spray Systems, Heidelberq, Germany, 2-6 September 2012. ABSTRACTThe mixing process on four shear-coaxial injectors with different outer-to-inner jet area ratios and varying inner jet post thickness is examined experimentally. The experiments were conducted at ~1.5MPa with varying outer-to-inner jet momentum flux ratios (0.5 -20), with and without a pressure antinode perturbation at the jet exit. Nitrogen was used as the test fluid. High speed backlighting movies, acoustic pressure measurements and temperature exit profiles are the main diagnostics used. Proper orthogonal decomposition was applied to the intensity fluctuation of the high-speed images to extract spatial and temporal characteristics of the dominant flow structures. The extent of the influence of outer-to-inner momentum flux ratio on mixing was dependent on the injector geometry. The inner jet lengths for a large outer-to-inner jet area ratio injector were more influenced by increasing momentum flux ratios. Regardless of injector geometry, lower momentum flux ratio (generally less than 5) flows were found to be more responsive to acoustic forcing. With increasing momentum flux ratio, the flow response to forcing depended on the injector geometry. SUBJECT TERMS AbstractThe mixing process on four shear-coaxial injectors with different outer-to-inner jet area ratios and varying inner jet post thickness is examined experimentally. The experiments were conducted at ~1.5MPa with varying outer-to-inner jet momentum flux ratios (0.5 -20), with and without a pressure antinode perturbation at the jet exit. Nitrogen was ...
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