Investigation of mixing characteristics of coflow rectangular nozzle of aspect ratio 2 and 3
- 2 September 2021
- journal article
- research article
- Published by Emerald in Aircraft Engineering and Aerospace Technology
- Vol. 94 (4), 613-622
- https://doi.org/10.1108/aeat-04-2021-0097
Abstract
The purpose of this study is to understand experimentally the mixing characteristics of a two-stream exhaust system with a supersonic Mach 1.5 primary jet that exits the rectangular C-D nozzle surrounded by a sonic secondary jet from a convergent rectangular nozzle by varying the aspect ratio (AR = 2 and 3) similar to those that can be available for future high-speed commercial aircraft. This paper focuses on the experimental results of effects of AR at various expansion levels of jets issued/delivered from a central rectangular convergent-divergent nozzle of AR 2 and 3 surrounded by a coflow from a convergent rectangular sonic nozzle. The lip thickness of the primary nozzle is 2.2 mm. various nozzle pressure ratios (NPRs) ranging from 2, 3, 3.69 and 4 were chosen for pressure measurements. For all the NPRs, AR 3 had a shorter core than AR 2. Also, AR 3 was found to decay faster in the transition and fully developed zones. The lateral plots show that the AR has an influence on the jet spread. The structure of waves existing in the potential core of the rectangular coflow jet along with the major and minor axis planes was visualized by the shadowgraph technique.Keywords
This publication has 21 references indexed in Scilit:
- Characteristics of Underexpanded Co-Flow JetsApplied Mechanics and Materials, 2014
- Effect of Co-Flow on Near Field Shock StructureJournal of Fluids Engineering, 2012
- Experimental Studies on Co-flowing Subsonic and Sonic JetsFlow, Turbulence and Combustion, 2011
- Experimental Studies on the Limiting TabAIAA Journal, 2009
- Mean Flow Development in Dual-Stream Compressible JetsAIAA Journal, 2002
- Experiments on mixing enhancement in dual-stream jetsPublished by American Institute of Aeronautics and Astronautics (AIAA) ,2001
- Effect of velocity ratio on the turbulent mixing of confined, co-axial jetsExperimental Thermal and Fluid Science, 2000
- FLOW CONTROL WITH NONCIRCULAR JETSAnnual Review of Fluid Mechanics, 1999
- Mach Wave Elimination in Supersonic JetsAIAA Journal, 1997
- Compressible spreading rates of supersonic coaxial jetsExperiments in Fluids, 1990