Abstract
The flow field of twin non-parallel jet configuration with outward canting has been studied experimentally to characterize its merging and confluence, as a function of inter nozzle spacing with an outward canting angle of 5. Two convergent nozzles of exit diameter D of 10 mm were set on common end-wall with their axes intersecting each other at half angle α of 5 degree and non-dimensional center-to-center spacing S/D 3, 4 and 5 have been studied at underexpanded conditions. The nozzles were operated at underexpanded conditions with nozzle pressure ratio (NPR) 3, 5, 7 and these NPRs correspond to low, moderate and high underexpansions, respectively. The results show that the nozzle spacing plays a dominant role, dictating the merging as well as the confluence of the twin jets. The merging point, the location at which Pt/Pa becomes greater than one, shifts downstream with increase of S/D. The confluence point, the peak location of the Pt/Pa shifts downstream with increase of S/D. The merging and confluence points are also influenced significantly by the NPR (fully expanded Mach number). With increase of NPR both merging and confluence points get shifted downstream, but the shift in the merging point is more rapid from NPR 3 to 5 compared to NPR 5 to 7.
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