Investigating the effect of local addition of hydrogen to acoustically excited ethylene and methane flames |
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| Affiliation: | 1. I.E. Tamm Theory Department, P.N. Lebedev Physical Institute of Russian Academy of Sciences, Moscow 119991, 53 Leninskii prosp., Russian Federation;2. Far Eastern Federal University, 8 Suhanova St., Vladivostok 690950, Russia;3. KIT – Karlsruhe Institute of Technology, Institute of Technical Thermodynamics, Engelbert-Arnold-Strasse 4, Building 10.91, D-76131, Karlsruhe, Germany;1. Department of Airframes and Powerplants, Ali Cavit Çelebioğlu Civil Aviation College, Erzincan Binali Yıldırım University, Erzincan 24100, Turkey;2. Department of Airframes and Powerplants, Faculty of Aeronautics and Astronautics, Erciyes University, Kayseri 38039 Turkey;1. Department of Industrial & Management Engineering, College of Engineering, Incheon National University, South Korea;2. Department of Safety Engineering, College of Engineering, Incheon National University, Academy-ro 119, Yeonsu-gu, Incheon 406-772, South Korea;1. Fluid System Engineering Department, KEPCO Engineering and Construction Company, 111, Daedeok-daero 989 Beon-Gil, Yusung-Gu, Taejeon, 34057, Republic of Korea;2. Department of Mechanical and Aeronautic Engineering, College of Engineering, Seoul National University, Republic of Korea;3. Department of Safety Engineering, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon, 22012, Republic of Korea;1. School of Mechanical and Automotive Engineering, Gangneung-Wonju National University, 150 Namwon-ro, Wonju-si, Gangwon-do, 220-711, Republic of Korea;2. School of Mechanical and Aerospace Engineering, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, 151-742, Republic of Korea |
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| Abstract: | While lean combustion in gas turbines is known to reduce NOx, it makes combustors more prone to thermo-acoustic instabilities, which can lead to deterioration in engine performance. The work presented in this study investigates the effectiveness of secondary injection of hydrogen to imperfectly premixed methane and ethylene flames in reducing heat release oscillations. Both acoustically forced and unforced flames were studied, and simultaneous OH and H atom PLIF (planar laser induced fluorescence) was conducted. The tests were carried out on a laboratory scale bluff-body combustor with a central V-shaped bluff body. Two-microphone method was used to estimate velocity perturbations from pressure measurements, flame boundary images were captured using high speed Mie scattering, while global heat release fluctuations were determined from OH* chemiluminescence.The results showed that hydrogen addition considerably reduced heat release oscillations for both methane and ethylene flames at all the forcing frequencies tested, with the exception of methane flames forced at 315 Hz, where oscillations increased with hydrogen addition. The addition of hydrogen reduced the extent of flame roll-up for both methane and ethylene flames, however, this reduction was larger for methane flames. NOx exhaust emissions were observed to increase with hydrogen addition for both methane and ethylene flames, with absolute NOx concentrations higher for ethylene flames, due to higher flame temperatures. |
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| Keywords: | Hydrogen addition H atom PLIF OH PLIF Combustion oscillations Flame dynamics Flame describing function |
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