Abstract
The laminar burning velocities of various HyCONG blends, consisting of hydrogen, carbon monoxide, and natural gas, were measured experimentally and numerically using the outwardly spherical expanding flame technique. Fifteen different combinations of H2, CH4, and CO were analyzed, with five CO blends (0%, 20%, 40%, 60%, and 80%) and three HCNG blends (0%, 20%, and 40%) by volume selected. To evaluate the uncertainty associated with extrapolation models, three models LS (linear model based on stretch rate), NQ (quasi-study nonlinear model), and N3P (nonlinear model with 3 fitting parameters) were used. Four chemical kinetic mechanisms (Aramco 2.0, San-Diego, GRI-Mech 3.0, and USC-Mech 2.0) were used for numerical analysis. The laminar burning velocity increased with increasing CO fraction for a constant H2, CNG (CH4) ratio, and equivalence ratio. The GRI-Mech 3.0 mechanism closely matched the LS-measured values, but the NQ and N3P models also predicted LBV well for some specific blends and equivalence ratios. CO enrichment in the fuel had a significant effect on the laminar burning velocity of the blend and adiabatic temperature, while the H2 fraction also played a noticeable role in the chemical kinetic study. The laminar burning velocity of the HyCONG blends increased with increasing equivalence ratio, which could be explained by the decreasing unburned blend density and increasing H and O radical concentration. The chemical reaction of CO and OH radical had the highest flowrate sensitivity at a high CO fraction HyCONG blend. Individual heat release rate analysis was performed for each type of chemical kinetic mechanism. The highest HRR is found as 14.7*108, 13.7*108, and 18.57*108 J/m3-s, respectively, for 0–80, 20–80, and 40–60 HyCONG at ϕ = 1.0. It is observed that the highest HRR is given by reaction s-R49 and a-R92 which is a similar kind of reaction and not participating in GRI-Mech 3.0 and USC-Mech 2.0. It was found that the best extrapolation model and kinetic mechanism are LS and GRI-Mech 3.0, but there is a possibility to reduce the mechanism for more accurate predictions.
Highlights
-
1.
LBV calculation using three different extrapolation models.
-
2.
Comparison of LBV using four different chemical kinetic mechanisms.
-
3.
The highest heat release rate was given by s-R49 and a-R92 which is a similar reaction.
-
4.
Flowrate sensitivity coefficient calculation for 45 different kinds of HyCONG blends.
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Acknowledgements
The author wants to acknowledge and express his gratitude toward Weichai Power Company Limited for allowing him to involve in HyCONG’s laminar burning velocity measurement research with Dr. Fanhua Ma from Tsinghua University. Authors also want to express gratitude toward Dr. Hao Duan for his valuable advice during the experimental data analysis. Furthermore, special thanks to Mr. Qiu Zhengtao for his ultimate support in experiments.
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Appendix
Appendix
-
(1)
Reactions of GRI-Mech 3.0 with symbols participated in the combustion of HyCONG blends.
S. No
Symbol
Reactions
1
g-R3
O + H2 < = > H + OH
2
g-R11
O + CH4 < = > OH + CH3
3
g-R33
H + O2 + M < = > HO2 + M
4
g-R35
H + O2 + H2O < = > HO2 + H2O
5
g-R36
H + O2 + N2 < = > HO2 + N2
6
g-R38
H + O2 < = > O + OH
7
g-R43
H + OH + M < = > H2O + M
8
g-R45
H + HO2 < = > O2 + H2
9
g-R46
H + HO2 < = > 2OH
10
g-R52
H + CH3(+ M) < = > CH4(+ M)
11
g-R55
H + HCO < = > H2 + CO
12
g-R97
OH + CH3 < = > CH2(S) + H2O
13
g-R99
OH + CO < = > H + CO2
14
g-R119
HO2 + CH3 < = > OH + CH3O
15
g-R166
HCO + H2O < = > H + CO + H2O
16
g-R167
HCO + M < = > H + CO + M
17
g-R284
O + CH3 = > H + H2 + CO
-
(2)
Reactions of Aramco 2.0 with symbols participated in the combustion of HyCONG blends.
S. No
Symbol
Reactions
1
a-R2
H2 + O < = > H + OH
2
a-R3
H2 + OH < = > H + H2O
3
a-R5
O2 + H < = > O + OH
4
a-R6
H + OH + M < = > H2O + M
5
a-R27
HO2 + H < = > OH + OH
6
a-R28
HO2 + H < = > H2 + O2
7
a-R34
H + O2(+ M) < = > HO2(+ M)
8
a-R36
CO + OH < = > CO2 + H
9
a-R37
CO + OH < = > CO2 + H (duplicate)
10
a-R43
CH3 + H(+ M) < = > CH4(+ M)
11
a-R44
CH4 + H < = > CH3 + H2
12
a-R46
CH4 + OH < = > CH3 + H2O
13
a-R92
CH3 + O < = > CH2O + H
14
a-R95
CH3 + OH < = > CH2OH + H
15
a-R163
HCO + M < = > H + CO + M
16
a-R164
HCO + O2 < = > CO + HO2
17
a-R166
HCO + H < = > CO + H2
-
(2)
-
(3)
Reactions of Aramco 2.0 with symbols participated in the combustion of HyCONG blends.
S. No
Symbol
Reactions
1
s-R1
H + O2 < = > OH + O
2
s-R2
H2 + O < = > OH + H
3
s-R3
H2 + OH < = > H2O + H
4
s-R6
H + OH + M < = > H2O + M
5
s-R9
H + O2(+ M) < = > HO2(+ M)
6
s-R10
HO2 + H < = > 2OH
7
s-R25
CO + OH < = > CO2 + H
8
s-R28
HCO + M < = > CO + H + M
9
s-R41
CH4 + H < = > H2 + CH3
10
s-R42
CH4 + OH < = > H2O + CH3
11
s-R48
CH3 + OH < = > S-CH2 + H2O
12
s-R49
CH3 + O < = > CH2O + H
13
s-R56
H + CH3(+ M) < = > CH4(+ M)
14
s-R68
T-CH2 + O2 < = > CO + OH + H
-
(4)
Reactions of USC-Mech 2.0 with symbols participated in the combustion of HyCONG blends.
S. No
Symbol
Reactions
1
u-R1
H + O2 < = > O + OH
2
u-R2
O + H2 < = > H + OH
3
u-R9
H + OH + M < = > H2O + M
4
u-R10
O + H + M < = > OH + M
5
u-R12
H + O2(+ M) < = > HO2(+ M)
6
u-R16
HO2 + H < = > OH + OH
7
u-R31
CO + OH < = > CO2 + H
8
u-R32
CO + OH < = > CO2 + H (duplicate)
9
u-R35
HCO + H < = > CO + H2
10
u-R39
HCO + M < = > CO + H + M
11
u-R40
HCO + H2O < = > CO + H + H2O
12
u-R88
CH3 + H(+ M) < = > CH4(+ M)
13
u-R92
CH3 + OH < = > CH2* + H2O
14
u-R123
CH4 + H < = > CH3 + H2
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Mehra, R.K., Jia, D., Sun, N. et al. Numerical analysis of laminar burning velocity of hydrogen and carbon monoxide-enriched natural gas (HyCONG) blends. J Braz. Soc. Mech. Sci. Eng. 45, 342 (2023). https://doi.org/10.1007/s40430-023-04257-z
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DOI: https://doi.org/10.1007/s40430-023-04257-z