Inclination Impact on the Mass Transfer Process Resulting from the Interaction of Twin Tandem Jets with a Crossflow

Twin jets in crossflow is a complex configuration that raises an increasing interest due to its presence in various common applications such as chimney stacks, film cooling, VSTOL aircrafts, etc... In the present paper, the twin jets were arranged inline with an oncoming crossflow; they were also inclined which resulted in similar elliptic cross sections of the nozzles' exits. The exploration of the flows in interaction was carried out numerically by means of the finite volume method together with the second order turbulent closure model, namely the Reynolds stress Model (RSM), and a non uniform grid system particularly refined near the injection nozzles. Once validated, the model was upgraded by introducing a temperature gradient and a non reacting fume within the emitted jets in order to follow its dispersion stages. Such a procedure is likely to give an extensive understanding of the resulting flowfield's mixing, expanding and dispersion. In a primer step, we showed the qualitative similarity of the different species' behaviors due to the adopted non reactive property of the handled fume. Then, we evaluated the impact of the jets' initial inclination angle on the emitted fume as well as on the environing air dispersion over the domain. A close dependence of both progressions is observed. Straightening the jets proved to enhance significantly the vertical ascension of the fume, postponing the homogenization of the resulting flowfield composition.