Numerical and Experimental Investigation of Near-Field Mixing in Parallel Dual Round Jets

Abstract

Parallel underexpanded round jets system has been widely used in engineering applications, and the flow field structures are very complex because of the jets interaction. In this paper, we studied the near-field mixing phenomenon in parallel dual underexpanded jets numerically by solving the Reynolds-Averaged Navier-Stokes Equations. The numerical results agree well with experimental data acquired by particle image velocimetry. Similar to plane jets, to some degree, two round jets are deflected towards the dual nozzle symmetry plane; the flow field can also be divided into three regions. Meanwhile, attempts have been made to predict merge point and combine point locations on certain cross profile of computational domain by correlating them with jet spacing and jet pressure ratio. The jet spacing plays an important role in jets interaction, and jet interaction decreases with the increase in jet spacing. The jets interaction in terms of merge (combine) point and pressure varies significantly while the jet spacing differs. Additionally, as pressure ratio increases, the effect of jet interaction decreases, and the merge (combine) point location moves downstream.

Numerical study of heat and mass transfer in underexpanded sonic free jet

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Numerical Study of Twin Jets Interactions using Realizable Model

“…The aim of this study is to investigate numerically the effect of surface curvature when placing different solids bodies between the two parallel jets. The Fluent software was used to solve the governing dynamic equations, due to its efficiency to provide reasonable solutions in many earlier studies [17][18][19][20]. Turbulent velocities and turbulent fields were examined and compared with the configuration without obstacle.…”

Effect of a Weak Jet on a Strong Jet

“…Recently, several experimental investigations were conducted on twin jets and multijets such as those performed by Okamoto et al (1985), Harima et al (2005), Tadatomo et al (1995), Meslem et al (2011), Rathakrishnan et al (1989), Buchlin, J. M. (2011), Yin et al (2007), Sabareesh (2015), Zheng et al (2016) and Bentarzi et al (2018). Rathakrishnan et al (1989) have shown that two identical jets completely merge at a distance of 30 diameters downstream their exits.…”