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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 56316 (45)
- University: Sharif University of Technology
- Department: Aerospace Engineering
- Advisor(s): Kebriaee, Azadeh
- Abstract:
- Injecting liquid fuel into the cross flow of air provides high penetration of the liquid, rapid mixing with air, and increased efficiency. This method has widespread applications in the propulsion systems of gas turbines, scramjets, turbine blade cooling, and fuel injection for engine afterburners. One of the design strategies for future aircraft engines is to reduce pollutants using fuel spray into the cross flow instead of direct jet fuel injection and using renewable energy sources. The applications of cross flows include injecting fluid through rotating pressure injectors in exhaust flows, injecting fluid through pressure-rotating injectors in radial injectors, and using slinger injectors in small aircraft engines. Depending on the type of application, the fluid can exit the injector in a column or in a sheet. Many studies have been conducted on the jet column injected into the cross flow, but the number of studies on sheet jet output is limited, and basic studies on identifying the physics of these phenomena have not been carried out. In this thesis, experimental study of injecting fluid into the cross flow using circular (liquid jet) and rectangular (liquid sheet) nozzles has been conducted. The method used for this study is shadowgraphy. Using this method, the parametric study of the effect of nozzle diameter, nozzle output schematic, jet velocity, and cross flow velocity on primary and secondary breakup from the jet column breakup is studied, and after obtaining the results of the studies, each of the nozzles is compared with each other. Overall, the focus of this study is more on injecting the fluid sheet into the cross flow and understanding the flow physics in this spray
- Keywords:
- Propulsion ; Cross Flow ; Spray ; Sheet Injection ; Jet Primary Breakup ; Liquid Jet ; Liquid Sheet
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