We experimentally studied and kinetically modeled the effects of hydrogen addition on soot formation in methane and ethylene counterflow diffusion flames (CDFs). To isolate the chemical effects of hydrogen in such flames, we also ran a set of experiments on flames of the same base fuels but with the addition of helium. Specifically, we measured the soot volume fractions of the flames using the planar laser-induced incandescence technique. We simulated detailed sooting structures by coupling the gas-phase chemistry with the polycyclic aromatic hydrocarbon (PAH)-based soot model, using a sectional method to resolve the soot particle dynamics. Our experimental and numerical results show that hydrogen chemically inhibits soot formation in ethylene CDFs. While in methane flames, it is interesting to observe that the difference in soot production between the hydrogen- and helium-doped cases became much smaller when the oxygen concentration in the oxidizer stream (X-O) was reduced. This suggests that for methane CDFs the chemical soot-inhibiting effects of hydrogen was highly dependent on oxidizer composition (i.e., X-O). Explanations are provided through detailed kinetic analysis concerning the effects of hydrogen addition on the growth of PAH, soot inception, and soot surface growth processes. Our results suggest that hydrogen's chemical role in soot formation not only depends on fuel type (ethylene or methane), it also may be sensitive to oxidizer composition. (C) 2019 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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Politecn Milan, Dipartimento Chim Mat & Ingn Chim G Natta, I-20133 Milan, ItalyPolitecn Milan, Dipartimento Chim Mat & Ingn Chim G Natta, I-20133 Milan, Italy
Cuoci, A.
Frassoldati, A.
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Politecn Milan, Dipartimento Chim Mat & Ingn Chim G Natta, I-20133 Milan, ItalyPolitecn Milan, Dipartimento Chim Mat & Ingn Chim G Natta, I-20133 Milan, Italy
Frassoldati, A.
Faravelli, T.
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Politecn Milan, Dipartimento Chim Mat & Ingn Chim G Natta, I-20133 Milan, ItalyPolitecn Milan, Dipartimento Chim Mat & Ingn Chim G Natta, I-20133 Milan, Italy
Faravelli, T.
Ranzi, E.
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Politecn Milan, Dipartimento Chim Mat & Ingn Chim G Natta, I-20133 Milan, ItalyPolitecn Milan, Dipartimento Chim Mat & Ingn Chim G Natta, I-20133 Milan, Italy
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Wuhan Univ Technol, Hubei Key Lab Adv Technol Automot Components, Wuhan 430070, Peoples R China
Wuhan Univ Technol, Sch Automot Engn, Wuhan 430070, Peoples R China
King Abdullah Univ Sci & Technol, Clean Combust Res Ctr, Thuwal, Saudi ArabiaWuhan Univ Technol, Hubei Key Lab Adv Technol Automot Components, Wuhan 430070, Peoples R China
Wang, Yu
Chung, Suk Ho
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King Abdullah Univ Sci & Technol, Clean Combust Res Ctr, Thuwal, Saudi ArabiaWuhan Univ Technol, Hubei Key Lab Adv Technol Automot Components, Wuhan 430070, Peoples R China
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Zhengzhou Univ, Sch Mech & Power Engn, Zhengzhou 450001, Henan, Peoples R ChinaZhengzhou Univ, Sch Mech & Power Engn, Zhengzhou 450001, Henan, Peoples R China
Li, Zhicong
Liu, Shijia
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Zhengzhou Univ, Sch Mech & Power Engn, Zhengzhou 450001, Henan, Peoples R ChinaZhengzhou Univ, Sch Mech & Power Engn, Zhengzhou 450001, Henan, Peoples R China
Liu, Shijia
Lou, Chun
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Huazhong Univ Sci & Technol, Sch Energy & Power Engn, State Key Lab Coal Combust, Wuhan 430074, Hubei, Peoples R ChinaZhengzhou Univ, Sch Mech & Power Engn, Zhengzhou 450001, Henan, Peoples R China
Lou, Chun
Kalayci, Nimeti
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Gazi Univ, Engn Fac, Mech Engn Dept, TR-06570 Ankara, TurkiyeZhengzhou Univ, Sch Mech & Power Engn, Zhengzhou 450001, Henan, Peoples R China
Kalayci, Nimeti
Zhang, Zhongnong
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Northeast Elect Power Univ, Sch Energy & Power Engn, Lab Therm Fluid Sci & Nucl Engn, Jilin 132012, Peoples R ChinaZhengzhou Univ, Sch Mech & Power Engn, Zhengzhou 450001, Henan, Peoples R China
Zhang, Zhongnong
Zhao, Kai
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Zhengzhou Univ, Sch Mech & Power Engn, Zhengzhou 450001, Henan, Peoples R ChinaZhengzhou Univ, Sch Mech & Power Engn, Zhengzhou 450001, Henan, Peoples R China
Zhao, Kai
Tang, Songzhen
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Zhengzhou Univ, Sch Mech & Power Engn, Zhengzhou 450001, Henan, Peoples R ChinaZhengzhou Univ, Sch Mech & Power Engn, Zhengzhou 450001, Henan, Peoples R China
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Anhui Univ Technol, Sch Met Engn, Maanshan 243002, Anhui, Peoples R China
Anhui Univ Technol, Sch Energy & Environm, Maanshan 243002, Anhui, Peoples R ChinaAnhui Univ Technol, Sch Met Engn, Maanshan 243002, Anhui, Peoples R China
Wang, Yang
Gu, Mingyan
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Anhui Univ Technol, Sch Energy & Environm, Maanshan 243002, Anhui, Peoples R ChinaAnhui Univ Technol, Sch Met Engn, Maanshan 243002, Anhui, Peoples R China
Gu, Mingyan
Chao, Ling
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Anhui Univ Technol, Sch Energy & Environm, Maanshan 243002, Anhui, Peoples R ChinaAnhui Univ Technol, Sch Met Engn, Maanshan 243002, Anhui, Peoples R China
Chao, Ling
Wu, Jiajia
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Anhui Univ Technol, Sch Energy & Environm, Maanshan 243002, Anhui, Peoples R ChinaAnhui Univ Technol, Sch Met Engn, Maanshan 243002, Anhui, Peoples R China
Wu, Jiajia
Lin, Yuyu
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Anhui Univ Technol, Sch Energy & Environm, Maanshan 243002, Anhui, Peoples R ChinaAnhui Univ Technol, Sch Met Engn, Maanshan 243002, Anhui, Peoples R China
Lin, Yuyu
Huang, Xiangyong
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Anhui Univ Technol, Sch Energy & Environm, Maanshan 243002, Anhui, Peoples R ChinaAnhui Univ Technol, Sch Met Engn, Maanshan 243002, Anhui, Peoples R China
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King Abdullah Univ Sci & Technol KAUST, Clean Combust Res Ctr CCRC, Thuwal, Saudi ArabiaKing Abdullah Univ Sci & Technol KAUST, Clean Combust Res Ctr CCRC, Thuwal, Saudi Arabia
Park, Sungwoo
Wang, Yu
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King Abdullah Univ Sci & Technol KAUST, Clean Combust Res Ctr CCRC, Thuwal, Saudi Arabia
Wuhan Univ Technol, Hubei Key Lab Adv Technol Automot Components, Sch Automot Engn, Wuhan, Peoples R ChinaKing Abdullah Univ Sci & Technol KAUST, Clean Combust Res Ctr CCRC, Thuwal, Saudi Arabia
Wang, Yu
Chung, Suk Ho
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King Abdullah Univ Sci & Technol KAUST, Clean Combust Res Ctr CCRC, Thuwal, Saudi ArabiaKing Abdullah Univ Sci & Technol KAUST, Clean Combust Res Ctr CCRC, Thuwal, Saudi Arabia
Chung, Suk Ho
Sarathy, S. Mani
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King Abdullah Univ Sci & Technol KAUST, Clean Combust Res Ctr CCRC, Thuwal, Saudi ArabiaKing Abdullah Univ Sci & Technol KAUST, Clean Combust Res Ctr CCRC, Thuwal, Saudi Arabia
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Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R ChinaHuazhong Univ Sci & Technol, State Key Lab Coal Combust, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China
Liu, Yang
Cheng, Xiaobei
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Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R ChinaHuazhong Univ Sci & Technol, State Key Lab Coal Combust, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China
Cheng, Xiaobei
Li, Yu
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Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R ChinaHuazhong Univ Sci & Technol, State Key Lab Coal Combust, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China
Li, Yu
Qiu, Liang
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Hefei Univ Technol, Sch Automot & Transportat Engn, Hefei 230009, Anhui, Peoples R ChinaHuazhong Univ Sci & Technol, State Key Lab Coal Combust, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China
Qiu, Liang
Wang, Xin
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Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R ChinaHuazhong Univ Sci & Technol, State Key Lab Coal Combust, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China
Wang, Xin
Xu, Yishu
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Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R ChinaHuazhong Univ Sci & Technol, State Key Lab Coal Combust, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China