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RANS simulation of turbulent lobed jet

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1640
pages 1597-1602

M. Sehaba
Energy and Naval Propulsion Laboratory (LEPN), University of USTO MB, Algeria

Mohammed Boulenouar
Aerospace and Propulsion Systems Laboratory, University of USTO MB, Algeria

Omar Imine
Laboratoire d'Aéronautique et Systèmes Propulsifs, Département de Génie Mécanique, Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf, USTO-MB, Oran, Algérie

Sinopsis

Numerical simulation of three-dimensional isothermal air jet exhausted from a lobed orifice at low Reynolds number was investigated by making comparison between results of the two turbulence models RANS of two equations: K−ε realizable and K−ω SST with experimental data. Velocity and pressure fields are coupled with SIMPLE algorithm (Switch implicit linked equation) using commercial code Fluent 6.3. Velocity and stream wise vortices contours of the two models shows clearly that the K−ω SST model predict very well the axes switching, which dominate the dynamic of the lobed orifice jet phenomena in the nearest region of the jet. The prediction of the lobed jet expansion and the potential core length was analysed and compared. The K−ε realizable designated as in the literature as the most accurate among four turbulent models including K−ω SST model to predict the lobed nozzle jet, seems unsuccessful for the lobed orifice jet prediction by under predicting the potential core length and doesn't display any visible axis switching. The K−ω SST model can be considered as an efficient tool for quickly optimizing lobed orifice design and analysing exit Reynolds number effect on the mixing performance.

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