高压燃烧室进气雷诺数对旋流预混燃烧特性的影响
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摘要
采用数值模拟的方法对干式低排放高压燃烧室的燃烧特性进行研究,通过与文献中实验数据对比,验证了模型的正确性。分析了不同进气雷诺数下燃烧室的速度场、压力场及燃烧室出口截面温度的分布情况。结果表明,雷诺数对燃烧室内的流场影响较大。随着雷诺数的增加,燃烧室的回流区范围增大,燃气流速增加。燃烧室出口温度上升,燃烧室出口截面中心区域温度由外向内呈升高趋势。
The combustion characteristics of a dry low emission high pressure combustion chamber are studied through numerical simulation. Then the model is validated by comparing the simulation result with the experimental data in the literatures. The velocity field, pressure field and temperature distribution at the exit of the combustion chamber under different inlet Reynolds number are analyzed. It is shown from the results that the value of Reynolds number has great impact on the flow field in the combustion chamber. As the Reynolds number increases, the central recirculation zone tends to expand with higher axial velocity at the central recirculation zone. In addition, the temperature at the exit of the combustion chamber rises, where the cross section temperature gradually increases from the external to the center. Besides, as the flow distance increases, the maximum velocity and range of the recirculation zone tend to decrease with the intensity of the reflux lessened and shrinking area of the external recirculation zone.
The combustion characteristics of a dry low emission high pressure combustion chamber are studied through numerical simulation. Then the model is validated by comparing the simulation result with the experimental data in the literatures. The velocity field, pressure field and temperature distribution at the exit of the combustion chamber under different inlet Reynolds number are analyzed. It is shown from the results that the value of Reynolds number has great impact on the flow field in the combustion chamber. As the Reynolds number increases, the central recirculation zone tends to expand with higher axial velocity at the central recirculation zone. In addition, the temperature at the exit of the combustion chamber rises, where the cross section temperature gradually increases from the external to the center. Besides, as the flow distance increases, the maximum velocity and range of the recirculation zone tend to decrease with the intensity of the reflux lessened and shrinking area of the external recirculation zone.
引文
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[19]谭建果,魏小林,郭啸峰,等.甲烷高压富养燃烧层流扩散火焰的数值研究[J].燃烧科学与技术,2013, 19(5):425-433.TAN Jianguo, WEI Xiaolin, GUO Xiaofeng, et al. Numerical study on oxygen-enhanced axisymmetric laminar methane diffusion flames at high pressures[J]. Journal of Combustion Science and Technology,2013, 19(5):425-433.
[2]蒋洪德,任静,李雪英,等.重型燃气轮机现状与发展趋势[J].中国电机工程学报,2014, 34(29):5096-5102.JIANG Hongde, REN Jing, LI Xueying, et al. Status and development trend of the heavy duty gas turbine[J]. Proceedings of the CSEE, 2014, 34(29):5096-5102.
[3]蒋洪德.加速推进重型燃气轮机核心技术研究开发和国产化[J].动力工程学报,2011,31(8):563-566.JIANG Hongde. Promote heavy duty gas turbine core technology development and industrial application in China[J]. Journal ofChinese Society of Power Engineering, 2011, 31(8):563-566.
[4]王海连.贫燃预混旋流燃烧不稳定性的大涡模拟[D].大连:大连理工大学,2014.
[5] STOPPER U, MEIER W, SADANADAN R, et al. Experimental study of industrial gas turbine flames including quantification of pressure influence on flow field, fuel/air premixing and flame shape[J]. Combustion and Flame,2013, 160(10):2103-2118.
[6] BULAT G, JONES W P, MARQUIS A J. Large eddy simulation of an industrial gas-turbine combustion chamber using the sub-grid PDF method[J]. Proceedings of the Combustion Institute, 2013, 34(2):3155-3164.
[7] BULAT G, JONES W P, MARQUIS A J. NO and CO formation in an industrial gas-turbine combustion chamber using LES with the Eulerian sub-grid PDF method[J]. Combustion and Flame, 2014,161(7):1804-1825.
[8]肖俊峰,王峰,高松,等.进气压力对燃气轮机预混燃烧稳定性影响[J].热力发电,2018,47(4):86-91.XIAO Junfeng, WANG Feng, GAO Song, et al. Effect of inlet pressure on premixed combustion stability of gas turbine[J]. Thermal Power Generation, 2018, 47(4):86-91.
[9]付忠广,王瑞欣,石黎,等.旋流器通道宽度对旋流预混燃烧特性影响数值模拟[J].热力发电,2018, 47(2):63-77.FU Zhongguang, WANG Ruixin, SHI Li, et al. Effect of cyclone channel width on swirling premixed combustion numerical simulation[J]. Thermal Power Generation, 2018, 47(2):63-77.
[10]郭培卿,葛冰.合成气非预混燃烧的数值模拟[J].计算机辅助工程,2014, 23(4):57-60.GUO Peiqing, GE Bing. Numerical simulation of non-premixed combustion of syngas[J]. Computer Aided Engineering, 2014, 23(4):57-60.
[11]赵晓燕,李详晟,丰镇平.燃气轮机低热值合成气燃烧室内三维湍流流动的数值模拟研究[J].动力工程学报,2009, 29(4):330-334.ZHAO Xiaoyan, LI Xiangsheng, FENG Zhenping. Numerical simulation of three-dimensional turbulent flow in gas turbine combustor with low calorific value syngas[J]. Journal of Chinese Society of Power Engineering, 2009, 29(4):330-334.
[12] LIU K, SANDERSON V. The influence of changes in fuel calorific value to combustion performance for Siemens SGT-300 dry low emission combustion system[J]. Fuel, 2013, 103:239-246.
[13] BULAT G, FEDINA E, FUREBY C, et al. Teacting flow in an industrial gas turbine combustor:LES an experimental analysis[J].Proceedings of the Combustion Institute, 2015, 35(3):3177-3183.
[14]邢双喜.微小型燃气轮机径向旋流预混燃烧特性研究[D].北京:中国科学院研究生院,2012.
[15] EL BAKALI A, DAGAUT P, PILLIER L, et al. Experimental and modeling study of the oxidation of natural gas in a premixed flame,shock tube, and jet-stirred reactor[J]. Combustion and Flame, 2004,137(1-2):109-128.
[16] SADASIVUNI S K, BULAT G, SANDERSON V, et al. Application of scalar dissipation rate model to Siemens DLE combustors[C]//ASME Turbo Expo 2012:Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012:361-370.
[17] HAN D S, KIM G B, KIM H S, et al. Experimental study of NOx correlation for fuel staged combustion using lab-scale gas turbine combustor at high pressure[J]. Experimental Thermal and Fluid Science,2014, 58:62-69.
[18] RUTAR T, MALTE P C. NOx formation in high-pressure jet-stirred reactors with significance to lean-premixed combustion turbines[J].Journal of Engineering for Gas Turbines and Power, 2002, 124(4):776.
[19]谭建果,魏小林,郭啸峰,等.甲烷高压富养燃烧层流扩散火焰的数值研究[J].燃烧科学与技术,2013, 19(5):425-433.TAN Jianguo, WEI Xiaolin, GUO Xiaofeng, et al. Numerical study on oxygen-enhanced axisymmetric laminar methane diffusion flames at high pressures[J]. Journal of Combustion Science and Technology,2013, 19(5):425-433.