Sharif Digital Repository

MILD combustion under high preheating and high dilution condition illustrates some interesting characteristics. Very low oxygen concentration in the reaction zone and reduced chemical reaction rates compared to conventional combustion are some of these features which make MILD combustion to be an unique type of combustion. In this work numerical investigation of a gas turbine model combustor (GTMC) was aimed to done using model of the EDC as turbulence-chemistry interaction combustion model. Modeling was performed by solving RANS equations and RSM equations for a 2D axisymmetric computational domain. The combustion chamber was investigated for both reacting and non-reacting conditions. A... 

Constant drilling in the shale formation causes many problems such as shale swelling and well instability. Annually many costs are spent dealing with these problems in the drilling industry. Many factors can affect this issue. The most important factor is the type of drilling fluid and its additives. The use of oil-based mud is the best option to deal with the clays instability but, due to environmental problems resulting from OBM, their use has been banned in most parts of the world. Therefore, the water-based mud is the only option for the oil industry that can modify its property by use of additives. In this study, the muds contain Nano silica have been introduced. Silicate as shale... 

Combustion sources such as diesel vehicles are the most of the particular matter sources in ambient air. Near the tailpipe, exhaust is very hot, condense and have high velocity. This properties cause to need special methods and instrument to collect them. Numerously of combustion sources will emitted the VOCs, IVOCs, and SVOCs. This component mixed with ambient air and changing to particle phase from gas phase. Reaction between nitrogen oxides with sunlight cause to damage ozone layer and tissue in long time. Furthermore, breathe of VOCs gases cause to eye irritation, gastrointestinal effects, Damage to the nervous system, headache, dizziness, fatigue, vibration and loss of organ... 

In this thesis numerical investigation on the effect of injecting plasma into the MILD combustion regime which is based on the low oxygen dilution and high preheated temperature, were carried out. The burner which was utilized in this study is a co-flow burner, consists of three coaxial channels. From the center to the outside, there is a fuel jet at the center part, a co-flowing dielectric barrier discharge (DBD), and a preheated air section that is vitiated. The DBD that was used in this study is generated between two coaxial electrodes of which the outer one (conical copper electrode) is covered with a dielectric material made of quartz. The burner is modeled in a 2D-axisymmetric... 

In mutual funds, due to the liquidity advantage, investors can trade their assets without paying cost. Flows dilute the effect of returns because funds cannot be invested immediately in high-risk assets or the fund manager cannot implement the optimal strategy. The effect of diluting cash flows can affect the fund's future performance and reduce shareholder returns. The effect of diluting the fund of flows in Iran is a very small amount of 0.08% per year, which is different from zero at a significant level of 5%, but economically this number is small and insignificant. Of course, the policies of investment funds and the pricing model of the value of the fund's assets can affect it and affect... 

In this study, the effects of using the co-flow air rotation on Kerosene combustion under air preheating and diluting conditions have been investigated. During this research, we have tried to achieve combustion under the MILD regime by simultaneous diluting, preheating, and swirling the co-flow air, which has also been achieved. To investigate the factors affecting the flame structure such as preheating temperature, dilution, swirl number, airflow rate, and also the type of fuel nozzle, the Sharif University MILD combustion test rig (SMCTR) has been upgraded in this research.The SMCTR has a symmetrically axial structure and provides a co-flow air with the desired temperature, swirl number,... 

In this study, the experimental study of kerosene mild spray combustion with the presence of the chamber has been investigated. The test rig that has been studied and improved is Sharif University of Technology's MILD Combustion Test Rig on a laboratory scale, which provides the possibility of studying spray combustion with preheating and high dilution. This test rig, while solving the problems of similar test stands, has the possibility of operating with liquid kerosene fuel, which is widely used in various industries. This test rig is axially symmetrical and provides the possibility of providing co-flow air with the desired temperature, swirl number and dilution rate for a liquid fuel...