Experimental study of premixed hydrogen enriched natural gas under an alternating-current (AC) electric field and application of support vector machine (SVM) on electric field assisted combustion

FUEL

卷:258

Article

Duan, Hao¹  Li, Zhijie²  Wang, Bo²  Mehra, Roopesh Kumar³  Luo, Sijie³  Xu, Chuanguo⁴  Sun, Baigang⁵  Wang, Xi⁵  Ma, Fanhua³ 

[1] Xian Univ Technol, Sch Mech & Precis Instrument Engn, Dept Mech Design, Xian 710048, Shaanxi, Peoples R China

[2] Weichai Power Co Ltd, State Key Lab Engine Reliabil, Weifang 261061, Peoples R China

[3] Tsinghua Univ, State Key Lab Automot Safety & Energy, Beijing 100086, Peoples R China

[4] China Natl Petr Corp Jichai Co Ltd, Jinan 250306, Shandong, Peoples R China

[5] Beijing Inst Technol, Sch Mech Engn, Dept Energy & Power Engn, Beijing 100081, Peoples R China

关键词: Hydrogen enriched natural gas;    Lean burn;    Ionic wind effect;    Bi-ionic wind effect;    Support vector machine;   

DOI  :  10.1016/j.fuel.2019.115934

来源: Elsevier

【 摘 要 】

Present research study explores the flame propagation and combustion characteristics of premixed hydrogen enriched natural gas under a 100 Hz low-frequency alternating-current (AC) electric field with various hydrogen blend ratios (0-100%) and fuel-air equivalent ratios (1.0/0.8/0.6) in a constant volume combustion chamber. Results show that: (1) With the application of the electric field, although the maximum pressure increases slightly, the mean flame propagation speed increases and the initial/main duration shortens apparently. At a hydrogen blend ratio of 20% and an equivalent ratio of 0.8, the mean flame propagation speed increases by 10.06%, and the initial/main duration shortens by 13.46%/10.72%. (2) The promotion effect of the electric field on the flame propagation and combustion of the fuel decreases gradually as the hydrogen blend ratio increases. There exists a maximum value of hydrogen blend ratio that electric field makes no difference to the combustion process and the value increases with the excess air ratio. The electric field almost has no effect on the pure hydrogen fuel. (3) Adding the AC electric field can improve the combustion of lean burn conditions more effectively than that of higher equivalent ratio conditions. Meanwhile, the support vector machine is applied for the predication of the flame propagation and combustion characteristics under electric fields. The prediction performance of the optimal model obtained by the SVM method for the maximum pressure is very accurate, while that of the mean flame propagation speed is relatively limited.

【 授权许可】

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