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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 43942 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Farahanieh, Bijan; Afshin, Hossein
- Abstract:
- An offset jet refers to a flow issuing above a wall offset by a distance h and parallel to the axis of the jet. Asymmetric entrainment on both sides of the jet causes the jet to deflect toward the plate. The flow field of an offset jet is complex and is encountered in many engineering applications. For instance, burners, boilers, combustion chambers and fuel injection system are strongly governed by the behavior of offset jets. The understanding of the flow field properties of offset jet is required to ensure the proper design of systems.
In this study the mean flow and turbulent properties of 3D offset jet with circular nozzle, developing in a stagnant environment, are studied by means of large eddy simulation and Launder-Sharma k-ε turbulent model. The decay of local maximum velocity, the locus of local maximum velocity in wall normal direction, jet half width in wall normal and lateral direction, non dimensional mean velocity profiles, Reynolds normal stresses and Reynolds shear stresses are presented and compared to experimental data. Good agreement is observed in mean flow parameters, between the simulation flow and the experimental data. Furthermore the flow field characteristics of 3D offset twin jets are investigated numerically by using Launder-Sharma k-ε turbulent model. The objective of this part of present study is to examine the effect of the velocity ratio (the ratio of upper jet velocity to lower one) on the structure of 3D turbulent offset twin jet - Keywords:
- Turbulence ; K-Epsilon Turbulence Model ; Large Eddy Simulation (LES) ; Three Dimentional Offset Jet ; Offset Twin Jet
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محتواي پايان نامه - view
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