Combustion Characteristic and Mechanism of a Mixture Working Fluid C3H8/CO2

doi:10.1007/s11630-021-1505-5

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	Combustion Characteristic and Mechanism of a Mixture Working Fluid C3H8/CO2
	Shi Weixiu 3; Pan LS(潘利生)1,2; Jin Suyi 3; Dong YH(董跃华)1,2; Li T(李腾)2; Zhao J(赵京)2; Wei XL(魏小林)1,2
刊名	JOURNAL OF THERMAL SCIENCE
	2021-08-26
页码	12
关键词	CO2-based mixture flammability laminar flame speed flammable critical mixing ratio transcritical power cycle
ISSN号	1003-2169
DOI	10.1007/s11630-021-1505-5
通讯作者	Pan Lisheng(panlisheng@imech.ac.cn) ; Li Teng(liteng@imech.ac.cn)
英文摘要	In the CO2 transcritical power cycle, conventional cooling water can hardly condense subcritical CO2 because its critical temperature is as low as 30.98 degrees C. In order to avoid this condensing problem, CO2-based mixtures have been proposed as working fluids for transcritical power cycle. They can raise the critical temperature by mixing a little C3H8 as the secondary component to CO2. However, the flammability of the mixture may limit its application. This article investigated laminar flame speed of C3H8/CO2 which represents the mixture's combustion characteristic by a so-called heat flux method and studied the inhibition mechanism of CO2 on the combustion based on the Premixed Laminar Flame-Speed Calculation reactor of Chemkin-Pro. The experimental results showed that the laminar flame speed shows a peak value with changing the equivalence ratio and accelerates with raising the mole fraction of the organic gas. Additionally, a slight upwards trend was observed for the corresponding equivalence ratio of the peaks. The flammable range for the equivalence ratio extended with the mole fraction of C3H8 increasing. With the mole fraction of C3H8 of 0.15, the maximum laminar flame speed was 12.8 cm/s, 31.7% of that of the pure C3H8. The flammable range was from 0.41 to 1.33, decreasing by 23.3% compared with that of C3H8. A flammable critical mixing ratio was also found as 0.08/0.92 for C3H8/CO2 at the normal condition. By simulating, it was found that the most key free radical and elementary reaction which determine the inhibition of CO2 on the combustion are OH and H+O-2=O+OH, respectively.
分类号	二类
资助项目	National Natural Science Foundation of China[51776215] ; National Natural Science Foundation of China[51736010]
WOS关键词	ORGANIC RANKINE CYCLES ; LAMINAR BURNING CHARACTERISTICS ; TRANSCRITICAL POWER CYCLE ; AIR ; CO2 ; PERFORMANCE ; SELECTION ; FLAMMABILITY ; VELOCITY ; DILUTION
WOS研究方向	Thermodynamics ; Engineering
语种	英语
WOS记录号	WOS:000690507600001
资助机构	National Natural Science Foundation of China
其他责任者	Pan Lisheng ; Li Teng
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/87377]
专题	中国科学院力学研究所
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China; 3.Beijing Univ Civil Engn & Architecture, Beijing Engn Res Ctr Sustainable Energy & Bldg, Beijing 100044, Peoples R China;
推荐引用方式 GB/T 7714	Shi Weixiu,Pan LS,Jin Suyi,et al. Combustion Characteristic and Mechanism of a Mixture Working Fluid C3H8/CO2[J]. JOURNAL OF THERMAL SCIENCE,2021:12.
APA	Shi Weixiu.,潘利生.,Jin Suyi.,董跃华.,李腾.,...&魏小林.(2021).Combustion Characteristic and Mechanism of a Mixture Working Fluid C3H8/CO2.JOURNAL OF THERMAL SCIENCE,12.
MLA	Shi Weixiu,et al."Combustion Characteristic and Mechanism of a Mixture Working Fluid C3H8/CO2".JOURNAL OF THERMAL SCIENCE (2021):12.