Sharif Digital Repository

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... 

Ethanol is a promising alternative fuel in terms of addressing future energy and environmental problems, so we can use ethanol as a fuel in passenger cars to eliminate enviremental problems. in this study, the CEV13-038 injector from ACRUS company is modeled. the research purpose is focused on the effect of ethanol , geometrical parameters, and the fuel type on the injected mass quantity and on turning the fuel supply system from a gasoline based system to ethanol based one.
In the first step of this study, The effect of ethanol, fuel temperature, needle lift, nozzle diameter and number of nozzles... 

An injector is one of the most important components of the two components chemical propulsion system used in satellite control. The design of an injector is a complicated and time-consuming process and is largely dependent on laboratory data. In this study, the spray characteristics obtained from a small scale swirl injector under different operating conditions have been experimentally measured in a laboratory environment, such as the injector discharge coefficient, spray cone angle, and the distribution of droplets in the field. To calculate the discharge coefficient, the flow rate of the injector has been measured for different operating pressures. The shooting method and image processing...