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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 48528 (45)
- University: Sharif University of Technology
- Department: Aerospace Engineering
- Advisor(s): Kebriaei, Azadeh
- Abstract:
- Due to importance of designing geometry and working condition of injector it is necessary that by testing cold flow, we gain better understanding of atomization characteristics and in particular initial atomization close to injector which defines the spray characteristics. Up to today experimental measurements in the high density zone close to injector has been difficult to to optical limitations and also analytical solutions of atomization process is limited due to complexity and highly nonlinear equations. Numerical solutions are also under development and researchers have recently done researches and simulations. In this field the modeling of liquid sheet collapse has challenged numerical simulation attempts because the collapse mechanism is not yet precisely determined and research on it is being continued and also because of presence of different length scales in liquid flow in spray formation models during formation and after collapse which cover a high range from small droplets to ligaments. In this thesis by using open source code of OpenFOAM which is based on C++ codes, numerical simulation along with adaptive mesh refinement (AMR) during numerical solution, for investigating the flow formation pattern after impact of two identical liquid cylindrical jets in different experimental conditions. Due to presence of different instability mechanisms in experimental conditions, numerical simulation is carried out in different Reynolds and Weber numbers and different governing physics of the flow is investigated. In this study also for the first time the impact of two cylindrical jets of different liquids with different properties is successfully simulated
- Keywords:
- Two Phase Flow ; Injectors ; Impinging Jet ; Numerical Solution ; Dynamic Mesh ; Liquid Jet
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