Sharif Digital Repository

Up to early seventies, Gas turbine combustor design was very time consuming and costly process including trial and errors through test rigs. Over the time analytical-experimental relationships take place as one of the key rules in the design processes. With the increasing power of computer calculations, computational fluid dynamics find its way in the procedure. Obtaining a deeper understanding of flow conditions and geometry inside the chamber, a great reduction in production time and cost of revisions to rigs and samples were achieved. Finding a precise prediction of polluting elements like NOx (less than 10 ppm) after many run hours and enormous computing resources, CFD methods must... 

The purpose of this study is to identify the combustion process, the role of different parts of this combustor and how the flame is stable in a slinger combustion chamber numerically. For this purpose, fuel injection, correct study of spatial distribution of droplets and evaporation process by Eulerian-Lagrangian multiphase model and mixing process, along with turbulence flow field by RANS method have been investigated. In this study, the actual geometry of the chamber is extracted and its effects on the outlet temperature distribution, chamber pressure drop, fuel evaporation region, etc. are studied.This simulation was performed by Fluent software due to its great ability to model... 

Annular combustion chambers used in small turbine motors which incorporate centrifugal (rotary) injectors for injecting fuel, are known as Slinger combustion chambers. The Slinger injector works in such a way that fuel enters from an inner tube in motor shaft and exits with high pressure from the holes on the cylinder connected to the shaft. Because of the high centrifugal force, the fuel is sprayed with high quality after entering the combustion chamber. Type and angle of spray, fuel-air mixing type, combustion phenomena and flame stability makes this different than other annular combustion chambers. The process of combustion in the Slinger chamber of YJ402 motor is numerically simulated in...