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