Unsteady RANS for simulation of high swirling non premixed methane air flame

2014-07-30
Solmaz, Burak
Uslu, Sıtkı
Uzol, Oğuz
Highly swirled non-premixed methane-air combustion is studied using Unsteady RANS. The increased CPU power at present times makes RANS solutions a viable design methodology for industrial applications. LES, Large Eddy Simulation, is still a bit far away from being the routine approach as a design tool in industry. The confined non-premixed TECFLAM S09C flame is investigated because of its similarity with gas turbine engine combustors. A block structured hexahedral computational mesh is used for the whole domain for higher numerical accuracy. A first-order accurate Euler Implicit technique is used for the temporal discretization of the transient terms. Realizable k-ε turbulence model is employed in order to account for the turbulent flow effects on the flow field and chemical reactions. Results of fast and two step reactions are compared with finite rate chemistry. Results show that, the best solution is obtained by using Finite Rate Eddy Dissipation Model. The infinitely fast chemistry approach is not capable of predicting the reaction delay that is clearly observed in the experiments. Instead, the fast chemistry approach show reaction zones in the close vicinity of the swirler where the fuel-air mixing is not well achieved for the reactions to take place in such a short distance. The flow field is directly affected by the heat release rate that is determined by the fuel air mixing and combustion model. © 2014 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.Made available in DSpace on 2021-01-13T09:16:40Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-07-30
AIAA/ASME/SAE/ASEE Joint Propulsion Conference, ( 28 - 30 Temmuz 2014)

Suggestions

The influence of relative humidity on photocatalytic oxidation of nitric oxide (NO) over TiO2
Üner, Deniz; Tabari, Taymaz (2015-11-01)
The influence of relative humidity on NO oxidation over commercial TiO2 (47 m(2)/g catalyst) was investigated. The experimental methodology followed the protocols described in ISO-22197: 2007 (E) standard. The adsorption characteristics of oxygen and H2O were monitored by adsorption calorimetry. Oxygen adsorption was low; on the contrary water vapor exhibited the characteristics of multilayer adsorption. In the first monolayer, the heats of adsorption of water sharply decreased from 180 to 80 kj/mol till ab...
Cofiring lignite with hazelnut shell and cotton residue in a pilot-scale fluidized bed combustor
Gogebakan, Zuhal; Selçuk, Nevin (2008-05-01)
In this study, cofiring of high ash and sulfur content lignite with hazelnut shell and cotton residue was investigated in 0.3 MWt METU Atmospheric Bubbling Fluidized Bed Combustion (ABFBC) Test Rig in terms of combustion and emission performance of different fuel blends. The results reveal that cofiring of hazelnut shell and cotton residue with lignite increases the combustion efficiency and freeboard temperatures compared to those of lignite firing with limestone addition only. CO2 emission is not found se...
The effects of metallic catalysts on light crude oil oxidation in limestone medium
Celebioglu, D; Bağcı, Ali Suat (2002-08-20)
In this study, 28 experiments were performed to study the effects of metallic additives on light crude oil oxidation in limestone medium. Karakus and Beykan crude oils from Turkish oil fields were used. The metallic additives were ferric chloride (FeCl3) copper chloride (CuCl) and magnesium chloride (MgCl(2)(.)6H(2)O). The mixture of aqueous solutions of three metallic salts with limestone and the crude oils was subjected to a controlled heating schedule under a constant flow rate of air. The produced gas w...
A novel blue-emitting phosphor: BaAl(2)B(2)O(7): Pb(2+)
Pekgozlu, I.; Seyyidoglu, S.; TAŞCIOĞLU, SÜLİN (Elsevier BV, 2008-09-01)
Pb(2+) doped BaAl(2)B(2)O(7) materials were prepared by a solution combustion synthesis. The phase of the synthesized materials was determined using the powder X-ray diffraction. The photoluminescent properties of Pb(2+) doped BaAl(2)B(2)O(7) materials were investigated using spectrofluorometer at room temperature. The emission and excitation bands of BaAl(2)B(2)O(7): Pb(2+) were observed at 423 and 266 nm, respectively. The dependence of the emission intensity on the Pb(2+) concentration for BaAl(2)B(2)O(7...
Development of property equations for butane and isobutane – preliminary design of household refrigeration cycle
Cüylan, Gökhan; Oskay, Rüknettin; Department of Mechanical Engineering (2009)
This study aims to simulate a vapor compression refrigeration cycle, working with either butane (R-600) or isobutane (R-600a). For this purpose a computer program is written to design a household refrigerator, by modeling a steady-state, vapor compression cycle, with user defined input data. Each refrigerator component can be designed separately, as well as parts of a single refrigeration system in the program. In order to determine the refrigerant thermophysical properties at different states, least square...
Citation Formats
B. Solmaz, S. Uslu, and O. Uzol, “Unsteady RANS for simulation of high swirling non premixed methane air flame,” presented at the AIAA/ASME/SAE/ASEE Joint Propulsion Conference, ( 28 - 30 Temmuz 2014), Cleveland, OH, 2014, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/88200.