caa a22 4500 477092934 CHVBK 20180405111519.0 cr unu---uuuuu 170330e19960401xx s 000 0 eng 10.1007/BF00189388 doi (NATIONALLICENCE)springer-10.1007/BF00189388 Visualization of supersonic screeching jets using a phase conditioned focusing schlieren system [Elektronische Daten] [R. Taghavi, G. Raman] This study describes a technique that combines the benefits of focusing schlieren and phase conditioning. Focusing schlieren blurs and drops contrast of non-critical features whereas phase conditioning emphasizes periodic flow features, and their combination produces unique results. The supersonic jets that we studied produced an intense tone referred to as screech. The measured screech tone signal was used as input to the phase conditioning circuit that adjusted the strobing light source to the vertical synchronization pulse of a CCD camera. The sharp video images obtained by this technique could either be frozen or continuously swept through one period of screech to acquire a slow motion video record of the jet unsteadiness. Two cases were visualized in this study: first, an underexpanded jet from a convergent rectangular nozzle at various fully expanded Mach numbers. Second, a supersonic jet emerging from a convergent-divergent rectangular nozzle at a design Mach number of 1.4, artificially excited by impingement tones. The results of this study illustrate the usefulness of this system in visualizing oscillatory flows. Springer-Verlag, 1996 Taghavi R. Department of Aerospace Engineering, The University of Kansas, 66045, Lawrence, Kansas, USA aut Raman G. NYMA Inc., Experimental Fluid Dynamics Section, NASA Lewis Research Center Group, 44142, Brookpark, Ohio, USA aut Experiments in Fluids Springer-Verlag 20/6(1996-04-01), 472-475 0723-4864 20:6<472 1996 20 348 https://doi.org/10.1007/BF00189388 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00189388 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Taghavi R. Department of Aerospace Engineering, The University of Kansas, 66045, Lawrence, Kansas, USA aut NATIONALLICENCE 700 1- Raman G. NYMA Inc., Experimental Fluid Dynamics Section, NASA Lewis Research Center Group, 44142, Brookpark, Ohio, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer-Verlag 20/6(1996-04-01), 472-475 0723-4864 20:6<472 1996 20 348 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer