Investigating the Influence of Nozzle Length and Diameter Ratio on Potential Core Length in Subsonic Jets
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Abstract
This study aims to explore the impact of nozzle geometry on the potential core length in subsonic jets, with a specific focus on variations in nozzle length and diameter ratio. The research investigates subsonic jets across a spectrum of nozzle lengths (10, 20, 30, 40, 50, 60 mm and orifice) and three diameter ratios (2, 3 and 4) under different Nozzle Pressure Ratios (NPRs) of 1.11, 1.27, 1.52 and 1.89. Utilising both numerical simulations and experimental data, this study thoroughly examines how changes in nozzle geometry influence potential core length. The findings reveal distinct trends: the potential core length increases from the orifice up to a 30 mm nozzle length, after which it remains constant despite further increases in nozzle length. Variations in the diameter ratio have only a minor effect on the potential core length. Experimental investigations on 10, 20 and 30mm nozzles show strong agreement with computational results, indicating an average increase in potential core length by 15%, 31% and 31% for nozzle lengths of 10mm, 20mm and 30mm, respectively, with a diameter ratio of 3, compared to the orifice under the studied NPR conditions.
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