Research on Equivalent Effects of Dilution Ratio and Temperature on Premixed Combustion of Natural Gas

doi:10.3969/j.issn.1000-1093.2018.05.021

Abstract

Abstract: 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 p_u and equivalence ratio  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 S_n, unstretched flame propagation velocity S_L, Markstein length L_b, laminar combustion velocity u_L and NO_x emission are analyzed in detail. The results show that S_L, flame development duration and combustion duration are nearly identical, but the laminar burning velocity u_L has a big difference at the operating points that have similar S_n value. The influence of dilution ratio on S_L and u_L is greater than that of initial temperature when the dilution ratio is small. Further research finds that the temperature difference ΔT_u= 50 K has equivalent effect on combustion process compared with dilution ratio ΔDR=2%. Under the boundary conditions of the similar S_n, the NO_x emission is lower under the conditions of higher initial temperature and dilution ratio compared with the smaller initial temperature and dilution ratio. Key

Key words: naturalgas, premixedcombustion, dilutionratio, couplingeffect, equivalenteffect

CLC Number:

TK16

HAN Zhi-qiang， QIAN Yun-shou， TIAN Wei， XIA Qi. Research on Equivalent Effects of Dilution Ratio and Temperature on Premixed Combustion of Natural Gas[J]. Acta Armamentarii, 2018, 39(5): 998-1005.

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第39卷
第5期2018 年5月兵工学报ACTA
ARMAMENTARIIVol.39No.5May2018

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