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Lip Thickness Effect on Coaxial Subsonic and Correctly Expanded Sonic Jet Mixing.

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Title: Lip Thickness Effect on Coaxial Subsonic and Correctly Expanded Sonic Jet Mixing.
Authors: Angelin, Irish1, Narenshankar, R.2, Sathishkumar, K.3 satz_aero@yahoo.com, Lokesh, K.3, Joel, E. Jeswanth3, Oneashi, R.3, Gowtham, A. Saravana3
Source: International Journal of Vehicle Structures & Systems (IJVSS). 2025, Vol. 17 Issue 5, p766-771. 6p.
Subjects: Mach number, Subsonic flow, Jet engines, Pressure drop (Fluid dynamics), Flow velocity
Abstract: The effects of lip thickness on coaxial subsonic and correctly expanded sonic jet at low-velocity ratio and high-velocity ratio have been studied numerically. Subsonic and correctly expanded sonic jets from coaxial jets of the same main nozzle exit diameter with velocity ratios of 20% and 100% at Mach numbers of 0.6 have been studied. A single jet having the same primary nozzle exit diameter as a coaxial main nozzle exit diameter was also analysed for correlation. Centerline total pressure and static pressure decay in the jet core. The findings indicate that the mixing of the highvelocity ratio jet is superior to the low-velocity ratio jet at all Mach numbers considered in this research. Also, the rim thickness of a coaxial nozzle strongly influences the jet flow mixing. Coaxial stream of lip thicknesses 10.7mm experience significantly higher mixing than the other lip thicknesses at both low and high-velocity ratios. For low lip thickness, the mixing of VR 20 becomes inferior to that of VR 100 coaxial jets. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The effects of lip thickness on coaxial subsonic and correctly expanded sonic jet at low-velocity ratio and high-velocity ratio have been studied numerically. Subsonic and correctly expanded sonic jets from coaxial jets of the same main nozzle exit diameter with velocity ratios of 20% and 100% at Mach numbers of 0.6 have been studied. A single jet having the same primary nozzle exit diameter as a coaxial main nozzle exit diameter was also analysed for correlation. Centerline total pressure and static pressure decay in the jet core. The findings indicate that the mixing of the highvelocity ratio jet is superior to the low-velocity ratio jet at all Mach numbers considered in this research. Also, the rim thickness of a coaxial nozzle strongly influences the jet flow mixing. Coaxial stream of lip thicknesses 10.7mm experience significantly higher mixing than the other lip thicknesses at both low and high-velocity ratios. For low lip thickness, the mixing of VR 20 becomes inferior to that of VR 100 coaxial jets. [ABSTRACT FROM AUTHOR]
ISSN:09753060
DOI:10.4273/ijvss.17.5.04