The Interference of Two-Dimensional Parallel Jets : 2nd Report, Experiments on the Combined Flow of Dual Jet

TLDR: In this article, the effects of distance between these two nozzles on the flow field were studied and the characteristics of combined flow were compared with those of a single jet, and the velocity profiles of the combined flow are similar and agree well with the theoretical profile of the single jet.

Abstract: Experiments on dual jet, issued from two parallel slot nozzles set on a common end wall, were reported in the 1st report. In this report, the measurement of flow in hte combined flow region of the dual jet are discussed. From these measurements, effects of distance between these two nozzles on the flow field were studied and the characteristics of combined flow are compared with those of a single jet. A summary of the results is as follows : (1) The velocity profiles of the combined flow are similar and agree well with the theoretical profile of the single jet, but the distributions of the turbulence intensities show a different property from those of the single jet. (2) The width of combined jet spreads linearly in the downstream direction and inceases with the distance between two nozzles. (3) Because of the negative pressure distribution in the combined jet, the total momentum fluxes in the downstream direction are not conserved, and the decay of the maximum velocity is stronger than that of a single jet.