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Farag, Ahmed
- A Study of the Flow Field and Combustion of Natural Gas-Air inside a Gas Turbine Combustor
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Authors
Akram Zeid
1,
Ahmed Farag
2
Affiliations
1 Marine Eng. Technology Dept., College of MT.
2 T, AASTMT, Alexandria, EG
1 Marine Eng. Technology Dept., College of MT.
2 T, AASTMT, Alexandria, EG
Source
Indian Journal of Mechanical Engineering and Research, Vol 1, No 1 (2013), Pagination: 1-22Abstract
This paper presented a study of the natural gas combustion in a swirl gas turbine combustor. The effect of the primary air swirl number, primary air/fuel mass ratio and the secondary/primary air mass ratios on the flow field and combustion characteristics of natural gas in air is investigated. For this purpose, a test rig was constructed including a vertical test combustor provided with an air swirler mounted at its upstream. Primary air, secondary air, and fuel lines are also included. Four different air swirlers having the same blockage ratio of 0.72 are used for the present investigation. The swirlers have the same hub (inner) diameter of 72 mm and the same outer diameter of 100 mm. The swirlers have different vane angles of 15o, 30o, 45o, and 60o to generate swirl numbers of different strengths of about 0.23, 0.5, 0.85 and 1.5, respectively. A three dimensional model was used to simulate the non reacting and reacting flows by using the computational fluid dynamics package Fluent 6.3. Comparing the measured test data with the numerical computations, a reasonable agreement is found. The results show that, increasing the primary air/fuel ratio and the secondary/primary air mass ratio leads to decreasing the average flame temperature and consequently the flame size. Increasing the secondary/primary air mass ratio leads to a decrease in the axial CO and CO2 concentrations and an increase in O2 concentration at the combustor exit.Keywords
Gas Turbine Combustor, Swirl Number, Secondary Air, Natural Gas Combustion CharacteristicsReferences
- Ryan J.Q., "Experimental Results for a High Swirl Ultra Compact Combustor for Gas Turbine Engine", M.Sc. Thesis, 2003, Department of Aeronautics and Astronautics, Air Force Institute of Technology.
- Syred N, Beer JM., “Combustion in swirling flows: a review. Combust and Flame”, 201, 23:143, 1974.
- Beer J.M. and Chigier N., "Combustion Aerodynamics", Applied Science Publishers LTD, London, (1972).
- Mellor M., “Design of Modern Gas Turbine Combustors", Academic Press, (1990).
- Syred N., and Beer J.M., “Combustion in Swirling Flow: A Review”, Combustion and Flame, 1974, 23:143-201.
- Chigier N. and Chervinsky A., "Experimental Investigation of Swirling Vortex Motion in Jets", Journal of Applied Mechanics, 1967, 34: 443-451.
- Escudier M.P. and Zehnder N., “Vortex-Flow Regimes, Vortex Breakdown Criterion", Journal of Fluid Mechanics, 1982, 115: 105-121.
- Fu Y., Cai J., Jeng S.M., and Mongia H., "Characteristics of the Swirling Flow Generated by a Countered Rotating Swirler”, 43rd, AIAA, Joint Propulsion conference and Exhibits, 2007, 2007-5690.
- Coghe A., Solero G., and Scribano G., “Recirculation Phenomena in a Natural Gas Swirl Combustor”, Experiments in Thermal Fluid Science, 2004, 28:709- 714.
- Tangirala V., Chen R.H., and Driscoll J.F., “Effect of Heat Release and Swirl on the Recirculation within Swirl-Stabilized Flames", Combustion Science and Technology, 1987, 51:75-95.
- Gad H.M., “Experimental Study of Spray Combustion Characteristics in a swirl type combustor”, Ph.D. Dissertation, 2010, Suez Canal University, Egypt.
- Gad H.M., Farag T.M., Abdel-Mageed S.I., Habik S.E. and Ezz-Eldien A.H. “Kerosene Spray Combustion Characteristics in a Swirl Type Combustor with Normal Secondary Air” Port Said Engineering Research Journal, 2010, 14, (2): 52 – 66.
- Terasaki T. "The effects of fuel–air mixing on NO formation in non-premixed swirl burners. In: Proc 26th symp on combustion. The Combustion Institute, 9: pp. 2733, 1996.
- Schmittel P, Gunther B, Lenze B, Leuckel W, Bockhorn H. "Turbulent swirling flames: experimental investigations of the flow field and formation of nitrogen oxide", Proceeding of the Combustion Institute 9, 228:303, 2000.
- Cheng TS, Chao YC, Wu DC, Hsu HW, Yuan T. "Effects of partial premixing on pollutant emissions in swirling methane jet flames", Combustion and Flame 78, 125:865, 2001.
- Nam Il Kim, Young Min Yun, Min Jung Lee “Non-premixed flame characteristics of opposed methane jets in coaxial narrow air stream tubes”, International Journal of Heat and Fluid Flow 31: 680–688, 2010.
- Attya, A. M., Habib, M. A., and Taha, M. R., “Flow and mixing in a gas turbine combustor”, the Bulletin of Faculty of Eng., Cairo Univ., PP. 419-438, 1990.
- Abou-Arab T. W., Salem H. and Elkotb M.M., “Factors affecting the performance of a 2-D natural gas combustor model” 1552 FUEL, 1990, Vol 69, December {Faculty of Engineering, Cairo University, Egypt.
- Desoki A. A., Khalaf A. S. and El-Mahallawy, F.M. “Combustion process in a gas turbine combustor when using H2, NH3 and LPG fuels”, Int. J. Hydrogen energy, vol. 15, No. 3, pp. 203-211, 1990.
- Shehata M. S., “Part 1 an investigation of the combustion behavior of premixing gas turbine combustor”, vol. 43, No. 5, 1996, pp. 967-983.
- Jian Zhang, Pu Yong, and Zhou Lixing "Turbulence Characteristics of Swirling Reacting Flow in a Combustor with Staged Air Injection” Chinese J. Chem. Eng., 14(5) 634-641 (2006).
- Sachin S. Vakil “Flow and Thermal Field Measurements in a Combustor Simulator Relevant to a gas turbine Aero-Engine” M. Sc., Thesis, Virginia Polytechnic Institute and State University, 2002.
- Lebedev A.B., Secundov A.N., Starik A.M., Titova N.S. Schepin A. M.,“Modeling study of gas-turbine combustor emissions” proceeding of the combustion institute 32 (2009) 294-2947.
- Fluent Program User Guide, September (2007).
- GAMBIT Program User Guide, September (2007).
- Tharwat M. F., “ A study of atomized premixed flame structure”, M. Sc.thesis, Cairo university 1977.
- Fawzy El-Mahallawy and Saad El-Din Habic “Fundamental and technology of combustion”, El Sevier Science Ltd First edition 2002.
- Effect of Preoperative Biofeedback on Anal Continence After Fistula in Ano Surgery
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Authors
Ahmed Farag
1,
Hany M.S. Mikhail
2,
Ahmed S. Khalifa
3,
Mohamed T. Mostafa
3,
Abdrabou N. Mashhour
2
Affiliations
1 Professor of General Surgery, Cairo University, EG
2 Assistant Professor of General Surgery, Cairo University, EG
3 Assistant Lecturer of General Surgery, General Surgery Department, Cairo University, EG
1 Professor of General Surgery, Cairo University, EG
2 Assistant Professor of General Surgery, Cairo University, EG
3 Assistant Lecturer of General Surgery, General Surgery Department, Cairo University, EG