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《Acta Armamentarii》 2018-05
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Research on Equivalent Effects of Dilution Ratio and Temperature on Premixed Combustion of Natural Gas

HAN Zhi-qiang;QIAN Yun-shou;TIAN Wei;XIA Qi;School of Automotive and Transportation,Xihua University;School of Oujiang,Wenzhou University;  
The equivalent effects of initial temperature and dilution ratio on premixed combustion of natural gas in the constant volume combustion bomb are studied. The initial pressure puand equivalence ratio Φ are set to be 0. 3 MPa and 1. 0 in experiment,respectively,and the ball type flame extension method by high speed schlieren photography is used in the experiment. Stretched flame propagation velocity Sn,unstretched flame propagation velocity SL,Markstein length Lb,laminar combustion velocity uLand NOx emission are analyzed in detail. The results show that SL,flame development duration and combustion duration are nearly identical,but the laminar burning velocity uLhas a big difference at the operating points that have similar Snvalue. The influence of dilution ratio on SLand uLis greater than that of initial temperature when the dilution ratio is small. Further research finds that the temperature difference ΔTu=50 K has equivalent effect on combustion process compared with dilution ratio ΔDR = 2%. Under the boundary conditions of the similar Sn,the NOxemission is lower under the conditions of higher initialtemperature and dilution ratio compared with the smaller initial temperature and dilution ratio.
【Fund】: 国家自然科学基金项目(51776177);; 四川省教育厅青年基金项目(13ZB0022);; 教育部“春晖”计划项目(Z2014059);; 流体及动力机械教育部重点实验室开放课题项目(szjj2016-006)
【CateGory Index】: TK16
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