Influence of coupled characteristics on the internallystaged combustor under lowpower operation
doi: 10.13224/j.cnki.jasp.2017.01.007
Influence of coupled characteristics on the internallystaged combustor under lowpower operation
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摘要: An ultralow emissions combustor, namely low emission stirred swirl (LESS) combustor was studied, based on a scheme of internallystaged/lean premixed and prevaporized (LPP) combustion. The LESS combustor consists of central pilot stage and outer surrounded coaxially main stage, between which there exists a physical isolation, namely the step height. The existence of step height delayed the pilot and main jets mixing. Experimental and numerical studies were carried out to investigate the influence of the step height on the combustion performance. A single dome rectangular combustor was utilized to conduct the lean lightoff and blowout experiments, and pollutant emission experiments. The experimental results showed that with the increase of step height by 38%, the lean lightoff and blowout fuel air ratio decreased by 574% and 375%, the NOx emission increased by 35.1%, and the combustion efficiency increased by 1.78%; while the CO,unburned hydrocarbons (UHC) emissions decreased. Furthermore, the total pressure loss was kept nearly constant. Nonreacting and reacting flow fields were numerically investigated to analyze the coupled characteristics of pilot and main jets with different step heights. A comparison of flow characteristics, spray structure, and combustion component as well as temperature field with different step heights was conducted. The numerical results showed that the increase of the step height shifted the peak velocity outwards. The enlargement of the primary recirculation zone (PRZ) resulted in the increase of the combustion efficiency and NOx emission, while the CO, UHC emissions decreeased.Abstract: An ultralow emissions combustor, namely low emission stirred swirl (LESS) combustor was studied, based on a scheme of internallystaged/lean premixed and prevaporized (LPP) combustion. The LESS combustor consists of central pilot stage and outer surrounded coaxially main stage, between which there exists a physical isolation, namely the step height. The existence of step height delayed the pilot and main jets mixing. Experimental and numerical studies were carried out to investigate the influence of the step height on the combustion performance. A single dome rectangular combustor was utilized to conduct the lean lightoff and blowout experiments, and pollutant emission experiments. The experimental results showed that with the increase of step height by 38%, the lean lightoff and blowout fuel air ratio decreased by 574% and 375%, the NOx emission increased by 35.1%, and the combustion efficiency increased by 1.78%; while the CO,unburned hydrocarbons (UHC) emissions decreased. Furthermore, the total pressure loss was kept nearly constant. Nonreacting and reacting flow fields were numerically investigated to analyze the coupled characteristics of pilot and main jets with different step heights. A comparison of flow characteristics, spray structure, and combustion component as well as temperature field with different step heights was conducted. The numerical results showed that the increase of the step height shifted the peak velocity outwards. The enlargement of the primary recirculation zone (PRZ) resulted in the increase of the combustion efficiency and NOx emission, while the CO, UHC emissions decreeased.
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[1] Stouffer S,Ballal D R,Mongia H C.Development and combustion performance of a highpressure WSR and TAPS combustor［R］.AIAA20051416,2005. [2] Imamura A, Yoshida M, Kawano M，et al.Research and development of a LPP combustor with swirling flow for low NOx［R］.AIAA20013311,2001. [3] Foust M J,Thomsen D,Stickles R,et al.Development of the GE aviation low emissions TAPS combustor for next generation aircraft engines［R］.AIAA20120936,2012. [4] Dhanuka S K,Temme J E,Driscoll J F,et al.Vortexshedding and mixing layer effects on periodic flashback in a lean premixed prevaporized gas turbine combustor［J］.Proceedings of the Combustion Institute,2009,32(2):2901-2908. [5] Dhanuka S K,Temme J E,Driscoll J F,et al.Instantaneous flow structures in a reacting gas turbine combustor［R］.AIAA20084683,2008. [6] Dhanuka S K,Temme J E,Driscoll J F,et al.Unsteady aspects of lean premixedprevaporized (LPP) gas turbine combustors:flameflame interactions［R］.AIAA20101148,2010. [7] Mongia H C.Recent advances in the development of combustor design tools［R］.AIAA20034495,2003. [8] Mongia H C.Perspective of combustion modeling for gas turbine combustors［R］.AIAA20040156,2004. [9] Mongia H C.Recent progress in comprehensive modeling of gas turbine combustion［R］.AIAA20081445,2008. [10] FU Zhenbo,LI Jibao,LIN Yuzhen.Experimental investigation on ignition performance of LESS combustor［R］.ASME Paper 2011GT45786,2011. [11] MAO Ronghai,SHANG Mingtao.Numerical simulation on circumferential staging of an aeroengine LPP combustor［R］.ASME Paper 2013GT95286,2013. [12] SHANG Mingtao,LU Shuqiang,MAO Ronghai.Numerical investigation of the effects of dilution hole geometry on the exit temperature profile and emissions of an aeroengine LPP combustor［R］.ASME Paper 2013GT95395,2013. [13] Mongia H C.TAPSA 4th generation propulsion combustor technology for low emissions［R］.AIAA20032657,2003. [14] FU Zhenbo,LIN Yuzhen,FU Qihui,et al.Experimental investigation on ignition and blowout performance of the internallystaged combustor with different step height［J］.Journal of Aerospace Power,2014,29(5):1062-1070.(in Chinese) [15] FU Zhenbo,LIN Yuzhen,ZHANG Chi,et al.Experimental investigation on the combustion performance of the internallystaged combustor pilot stage［J］.Journal of Aerospace Power,2015,30(1):46-52.(in Chinese) [16] KANG Yao,LIN Yuzhen,FU Zhenbo,et al.The effect of step height on LESS combustor［J］.Journal of Propulsion Technology,2014,35(5):675-680.(in Chinese) [17] Mongia H C,AlRoub M,Danis A,et al.Swirl cup modeling:Part Ⅰ［R］.AIAA20013576,2001. [18] Lefebvre A H.Gas turbine combustion［M］.Phiadelphia,US:Taylor & Francis Press,1999. -
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