| Abstrakt: |
The study focuses on novel attributes of subsonic Co-Flowing Jet Mach number decay by varying the lip thickness, which is the gap between the core nozzle. Three different lip thicknesses namely 2mm, 10mm, and 15mm at exit Mach numbers for main jets of 0.6, 0.8, and 1.0 were studied. Axial Pitot static tube survey was conducted experimentally, and the flow field has been visualized using numerical velocity contours. For comparison, a Co-Flowing Jet with a 2mm lip thickness was used. For a single jet, the axial Mach number at the Potential core region remains constant, at subsonic, correctly expanded and sonic conditions. The trend remains the same for the Co-Flowing Jet with negligible lip thickness. But, for finite lip thickness, it was found that the axial Mach number in the near field is not constant for finite lip thickness. The axial Mach number does not show a constant potential core. Initially, it increases because of the wake dominant sub-atmospheric pressure to which it exists, followed by characteristic decay region. The decay is pronounced for a 15mm nozzle lip. A recirculation zone is found in the wake region which deflects the surrounding jet towards the core jet. The wake region affects the characteristics along and across the jet. [ABSTRACT FROM AUTHOR] |
