Abstract
This paper presents a numerical and analytical study of structure and flow development in planar (2- dimensional) turbulent jets. The numerical results are used to develop a phenomenological solution, here referred as Bending Model, for twin turbulent plane jets. The effects of nozzle- nozzle spacing and injection angle are emphasized in numerical study. This study includes a wide range of nozzle- nozzle spacing, 4.25, 9 and 18.25 and injection angle between - 20 to 20. In the farfield, the k-e model predicts the velocity of the jet higher than the experimental results; however, the overall performance of k-e model is acceptable in the prediction of velocity field. Mean velocity and static pressure fields are presented. The Bending Model can predict the attachment of two plane jets for a wide range of nozzle-nozzle spacing and injection angle. Based on the model and modified Reichardt's hypothesis, the flow field in the domain is predicted. The results are compared with the numerical simulation of the k-є model and previous experimental results. The results show encouraging agreement with the numerical and experimental results.
Highlights
Turbulent twin jets have numerous industrial applications including in burners, boilers, gas turbine, combustion chambers and fuel injection systems
In the present study the mean velocity and static pressure field is presented for turbulent twin jets from the numerical study
The Bending Model results compared with numerical simulation of the k-є model and the experimental results
Summary
Turbulent twin jets have numerous industrial applications including in burners, boilers, gas turbine, combustion chambers and fuel injection systems. The main concept arriving at the solution is that the momentum profiles across a single jet can be superimposed to predict the velocity profiles for flow from multiple nozzles. Pani (1983) compared the theory with the experimental data for three dimensional jets and the theory could predict the distribution of velocity in the domain In these cases the Reichardt's hypothesis is applied for the cases in which pressure term does not play a major role the centerlines of the jets remain at the injection line.
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