An Experimental Investigation of the Performance of a Small Three-Dimensional Coanda Nozzle.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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An experimental investigation was conducted to determine whether a small, three-dimensional, four channel Coanda nozzle with parallel secondary control injection could be used for multi-directional control of a compressible fluid jet. The nozzle was equipped with adjustable channel partitions which permitted variable channel openings. The size of the throat of the nozzle was varied from 0.030 to 0.094 in. The nozzle had a divergence half-angle of 10 degrees and a setback ratio that varied from 2.45 to 7.65. Operating pressures were varied from 0 to 95 psig. Successful fluid jet control was obtained with low pressures for setback ratios of 2.45 and 2.77, and 2.17, and medium and high pressure for setback ratios of 3.15 and above. For each nozzle setback ratio, there correspond an optimum channel opening that yielded the best switching performance. The minimum control pressure necessary for effective switching increased with increasing operating pressures and decreasing setback ratios. Author
- Fluidics and Fluerics