Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

Browse

Filters

2007 - 200912010 - 20192

Settings

Access Right: Open AccessSubject: search.filters.subject.Combustion

Search Results

Now showing 1 - 3 of 3
  • Master Thesis
    Spray Characterization for Water-In Emulsions
    (Izmir Institute of Technology, 2019) Çellek, Seven Burçin; Özkol, Ünver
    As we consider the pollutions caused by combustion engines, they have a big impact on several problems like global warming, acid rain, etc. Engineers and scientists are willing to control the pollutants and to reduce them as low as possible. There are some possible solutions to reduce environmental problems such as diesel particulate filters, high pressure fuel injection equipment, and sophisticated piezo injectors and associated control systems. However, all mentioned solutions need a modification on the current engine system to be used. Because of high costs of modification, recently, fuel-based solutions are more popular. This study investigates one of the possible fuel-based solutions which is water-in-diesel emulsions. Through the work, spray characteristics such as spray penetration and spray angle have been examined and compared with neat diesel spray. In order to achieve the purpose of this research, experiments have been carried out in a constant volume combustion chamber and all have been recorded by the help of a high-speed camera. A Matlab algorithm has been developed to analyse the recorded data. It was found that, due to lower volatility of the water, water-in-diesel emulsion has longer and wider spray when compared to neat diesel spray. According to the literature, this results in better fuel-air mixing for combustion process, hence cleaner exhaust gas.
  • Master Thesis
    Cogeneration Sustainability Study for the Izmir Institute of Technology
    (Izmir Institute of Technology, 2017) Ahmad, Awais; Rodriguez, Alvaro Diez
    In this study, feasibility of Cogeneration/Combined Cycle System will be evaluated for the Izmir Institute of Technology. Turkish Energy Policy lacks some key factors which need to be highlighted for achieving Energy targets. The first aim of this study is to compare the policies and implementation of combined cycle systems of Turkey with Europe and to analyze the steps carried out by European Countries to achieve sustainability. The main objective of this study includes the implementation of a combined cycle system based on the data collection from the authorities of the Institute to analyze the deficiencies of existing system and to propose a more efficient system for meeting the energy demand. Two systems were taken in consideration, a gas turbine and a reciprocating engine based combined cycle system, detailed energy analysis with emissions and cost analysis were presented to determine what case provides the best solution to meet the energy demand.
  • Master Thesis
    Optimization of Lamella Burner Fin Deck
    (Izmir Institute of Technology, 2007) Çetin, Gökçe; Özerdem, Mehmet Barış
    Lamella burner is a low NOx burner patented by BOSCH Thermotechnologies.In this study, different designs of fin deck, which is one of the major components of the lamella burner, are experimentally analyzed and optimized. After the optimization process, a numerical analysis was used for verification.Emissions are the most important properties for the gas fired boilers and directly related with the design of the burner parts where the combustion occurs. In the lamella burner, fin deck is the most related part with combustion. Combustion occurs on the fin deck surface hence, current fin deck design analysis and optimization is based on the emission rates in order to keep the lamella burner as low-emission (both NOx and CO)burner.This study mainly consists: summary of main parameters regarding combustion and fin deck, experimental analysis, and verification of optimized fin deck model with numerical simulation. Firstly, gas combustion and lamella burner are investigated. Physical conditions and combustion characteristics for fin deck are analyzed and layout parameters for fin deck are deducted. Afterwards, four new fin deck designs are introduced as alternatives for the current design. In the experimental part, emission, light back, flame lift, temperature and pressure drop tests are performed for serial and each new sample in the BOSCH Product Development Laboratories, Manisa. According to the test results, the most preferred sample is defined as optimized one.Test results are discussed to explain whether the fin deck samples are preferable or not. In the combustion curve performance test, CO values are measured. The comparison between the combustion curve test results show that CO formation is related to the fin deck geometry. Geometry affects flame stability because of the differences in mixture velocity distributions. The unburned gas in exhaust is one of the causes of the CO formation and influenced from the flame stability. Therefore,unburned gas mass fractions in exhaust are different for the samples with different geometries. This result is also numerically verified in combustion simulations of two different fin deck models, which one of them is considered as optimized sample.