稀释率与温度耦合作用对天然气预混燃烧等量影响研究

doi:10.3969/j.issn.1000-1093.2018.05.021

兵工学报 ›› 2018, Vol. 39 ›› Issue (5): 998-1005.doi: 10.3969/j.issn.1000-1093.2018.05.021

稀释率与温度耦合作用对天然气预混燃烧等量影响研究

韩志强¹, 钱云寿¹, 田维¹, 夏琦²

（1.西华大学汽车与交通学院，四川成都 610039； 2.温州大学瓯江学院，浙江温州 325035）

收稿日期:2017-10-23 修回日期:2017-10-23 上线日期:2018-06-22
作者简介:韩志强（1981—），男，副教授，硕士生导师。E-mail：8312862@qq.com
基金资助:
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）

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

HAN Zhi-qiang¹， QIAN Yun-shou¹， TIAN Wei¹， XIA Qi²

(1.School of Automotive and Transportation, Xihua University, Chengdu 610039, Sichuan, China;2.School of Oujiang， Wenzhou University, Wenzhou 325035, Zhejiang, China)

Received:2017-10-23 Revised:2017-10-23 Online:2018-06-22

摘要/Abstract

摘要： 基于定容燃烧弹，利用球形发展火焰和纹影法研究了在初始压力0.3 MPa、当量比1.0条件下，不同初始温度、稀释率时的天然气预混燃烧等量影响关系。分析了拉伸火焰传播速度、无拉伸火焰传播速度、马克斯坦长度、层流燃烧速率及NO_x排放变化规律。结果表明：在拉伸火焰传播速度相近组别的工况点，无拉伸火焰传播速度、火焰发展期、燃烧持续期近乎相同，但层流燃烧速率存在较大的差异；在稀释率较小阶段，无拉伸火焰传播速度和层流燃烧速率受稀释率影响比受初始温度影响更大。进一步研究发现：温度差50 K与稀释率差2%具有一定等量影响效果；相近拉伸火焰传播速度组别的边界条件下，相比更小初始温度与稀释率工况点，更高初始温度与稀释率工况点的NO_x排放量更低。

关键词: 天然气, 预混燃烧, 稀释率, 耦合作用, 等量影响

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

中图分类号:

TK16

韩志强, 钱云寿, 田维, 夏琦. 稀释率与温度耦合作用对天然气预混燃烧等量影响研究[J]. 兵工学报, 2018, 39(5): 998-1005.

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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稀释率与温度耦合作用对天然气预混燃烧等量影响研究

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

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