Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2023
Thesis Language: Turkish
Student: Çağrı TÜMER
Supervisor: Serhat Karyeyen
Open Archive Collection: AVESIS Open Access Collection
Abstract:
Due to the increase in energy demand and the depletion of fossil energy resources worldwide, resources should be used more efficiently. The damage to the environment of the resources used increases in parallel with the increase in energy demand and causes irreversible damages. With colorless distributed combustion approach, it was aimed to minimize the environmental damage of the fuels, and in this study, colorless distributed combustion method was applied. Premixed air-fuel mixture was introduced into a combustor, and the results were examined by changing the excess air coefficient (λ) under different conditions. The combustion reactions were first determined. 21% O2 concentration in the air was changed to 19%, 17%, and 15%, and colorless distributed combustion was achieved. Excess air ratio λ=1,2 was first determined, and the results obtained are evaluated. Then, excess air ratio was changed as λ=1.7, and excess air ratio effects on colorless distributed combustion was investigated.The existing modeling results were compared for the validation of the model, and it is concluded that the results are in good agreement with the existing results. Modelings were performed at boundary conditions being a thermal power of 10 kW (about a thermal intensity of 70 MW/m3.atm). In order to achieve colorless distributed combustion, modelings that oxygen concentration in the air inside the fuel-air mixture was to be 21% O2 (conventional combustion), 19% O2, 17% O2, and 15% O2 were performed. N2 was selected as the diluent to achieve colorless distributed combustion (simulation of combustion products recirculation). According to the results, via colorless distributed combustion, a more uniform thermal field which is particularly so important for gas turbines and/or aircraft engine combustors was obtained along with decrease in CO2, NOX, and CO2 emissions.
Key Words : Colorless distributed combustion, ultra low emissions, premixed burner combustion, computational fluid dynamics