Laminar burning velocity and Markstein length of nitrogen diluted natural gas/hydrogen/air mixtures at normal, reduced and elevated pressures

Miao, Haiyan; Ji, Min; Jiao, Qi; Huang, Qian; Huang, Zuohua

doi:10.1016/j.ijhydene.2009.01.059

Cited by 38 publications

(13 citation statements)

References 29 publications

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“…While experimentally determined laminar burning velocities and ignition delay times are commonly used for developing and validating chemical-kinetic models of fuel oxidation, such data are scarce for mixtures with significant amounts of CO 2 . Experimental data on laminar burning velocities of CO 2 -diluted mixtures are available for several fuels, such as methane, − methane/hydrogen (or natural gas/hydrogen) blends, − hydrogen, syngas, − iso-octane, , and DME. , The studies suggest that CO 2 has both physical and chemical influences on laminar burning velocity. The chemical effects identified for CO 2 are due to its direct participation in some important elementary reactions and as a third-body collider thanks to its high collision efficiency .…”

Section: Introductionmentioning

confidence: 99%

Shock Tube and Kinetic Study on the Effects of CO₂ on Dimethyl Ether Autoignition at High Pressures

et al. 2019

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First-stage and overall ignition delay times of dimethyl ether (DME) were measured in a high-pressure shock tube for various mixtures containing high amounts of CO2. The data are available for DME/air mixtures diluted with 40% CO2 as well as for the mixture of DME and oxidizer containing 20.5% O2 and 79.5% CO2. As a reference, data were also collected for mixtures containing the corresponding amounts of N2. Measurements were conducted for pressures of 15, 35, and 50 bar and a range of temperatures (744–1316 K). For the DME/air mixture diluted with CO2, the equivalence ratio was varied in the range of 0.5–2.0. The results demonstrate that CO2 dilution has a strong effect on ignition delay times in the NTC (negative temperature coefficient) region. The kinetic study that was conducted showed that this phenomenon can be attributed to a thermal effect resulting from the high heat capacity of CO2. In low and high temperature ranges, the effect of CO2 is less pronounced. Additionally, a chemical effect was identified. At high temperatures this effect can be attributed mostly to the influence of CO2 on third-body reactions and leads to slight acceleration of ignition. Various chemical-kinetic models available were evaluated with respect to their accuracy in prediction of ignition delay times for mixtures containing DME and large amounts of CO2.

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Section: Introductionmentioning

confidence: 99%

Shock Tube and Kinetic Study on the Effects of CO₂ on Dimethyl Ether Autoignition at High Pressures

et al. 2019

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“…Thus, this rough circle in the images has an equivalent radius ru, which is derived based on the circumference and the area. Therefore, the jet premixed flame velocity u premix is defined as follows (Miao et al, 2009) [24].…”

Section: Images Post Process and Parameter Definitionmentioning

confidence: 99%

“…Here, r u is the radius of the methane jet premixed flame. Flame stretch rate α is given by Equation ( 2) (Miao et al, 2009) [24].…”

Section: Images Post Process and Parameter Definitionmentioning

confidence: 99%

Experimental Research of High-Pressure Methane Pulse Jet and Premixed Ignition Combustion Performance of a Direct Injection Injector

et al. 2021

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Natural gas (NG) direct injection (DI) technology benefits the engine with high efficiency and clean emissions, and the high-pressure gas fuel injection process causes crucial effects on the combustion. This study presents an optical experimental investigation on the high-pressure methane single-hole direct injection and premixed ignition combustion based on a visualization cuboid constant volume bomb (CVB) test rig. The experimental results show that the methane jet process is divided into two stages. The methane gas jet travels at a faster speed during the unstable stage I than that during the stable stage II. The injection pressure causes more influence on both the jet penetration distance and the jet cone area during stage II. The methane jet premixed flame is a stable flame with a nearly spherical shape, and its equivalent radius linearly increases. The methane jet premixed flame area also increases while the flame stretch rate declines. The methane jet premixed flame velocity rises as both the standing time and equivalent ratio increase. The methane jet premixed flame is a partial premixed flame, and the peak of the methane jet premixed flame occurs at greater equivalence ratio ϕ, i.e., ϕ > 2. As the injection pressure rises, the jet premixed flame equivalent radius increases, and the flame velocity linearly increases. The higher the methane injection pressure, the faster the jet premixed flame velocity.

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“…It can be used to reflect the combustion characteristics of fuel, such as laminar combustion velocity (LBV), ignition energy, maximum flame temperature, ignition temperature and concentration, ignition delay period, etc. To identify the impurity gas (N 2 , CO 2 , and H 2 O) in methane that plays a role in its laminar premixed combustion process, Miao et al , experimentally studied the effects of dilution of CO 2 and N 2 on laminar combustion characteristics of natural gas–hydrogen blended fuel in a constant volume combustion bomb and found that dilution of CO 2 and N 2 reduced the LBVs. Besides, the methane laminar premixed flame with CO 2 and N 2 has been studied experimentally and numerically by Zhang et al The results show that the existence of CO 2 and N 2 inhibits the formation of NO and the specific dilution effect of reducing NO emission is related to the equivalence ratio.…”

Section: Introductionmentioning

confidence: 99%

Modeling Study of the Impact of Blending N₂, CO₂, and H₂O on Characteristics of CH₄ Laminar Premixed Combustion

et al. 2019

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N2, CO2, and H2O are impurity components in the biogas fuel production process, which are added at an appropriate amount to the combustion of hydrocarbon fuel that can effectively reduce the emissions of NO x and soot precursors [polycyclic aromatic hydrocarbons (PAHs)]. In this paper, using N2, CO2, and H2O as dilution gas, the CHEMKIN-II/PREMIX code with detailed chemical reaction mechanism GRI-Mech 3.0 was chosen to calculate the premixed combustion characteristics and NO x emissions of CH4. At different equivalence ratios (Φ = 0.8, 1.0, and 1.2) and blending ratios (0–40%), the physical and chemical effects of different dilution gases were systematically studied through the introduction of hypothetical substances FN2, FCO2, and FH2O. The results show that the laminar burning velocity and adiabatic flame temperature of CH4 were decreased by adding N2, CO2, and H2O, and the influence of the three diluents increases with the increase of the blending ratios, following the order of CO2 > H2O > N2. Moreover, the physical and chemical effects are greatest at stoichiometric conditions, and physical effects are much greater than chemical effects. In particular, at Φ = 1.2, the chemical effect of H2O leads to the adiabatic flame temperatures of CH4 gradually increasing as the dilution ratio (D r) increases. The sensitivity analysis of the main elementary reactions, which play a leading role in the influence of NO generation, shows that the adiabatic flame temperature of CH4 is reduced after adding N2, CO2, and H2O, depressing the generation of NO. The generation path of NO is mainly prompt NO x , and the responsible reactions are reactions R38, H + O2 ⇄ O + OH; R240, CH + N2 = HCN + N; and R52, H + CH3 (+M) ⇄ CH4 (+M).

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Laminar burning velocity and Markstein length of nitrogen diluted natural gas/hydrogen/air mixtures at normal, reduced and elevated pressures

Cited by 38 publications

References 29 publications

Shock Tube and Kinetic Study on the Effects of CO₂ on Dimethyl Ether Autoignition at High Pressures

Shock Tube and Kinetic Study on the Effects of CO₂ on Dimethyl Ether Autoignition at High Pressures

Experimental Research of High-Pressure Methane Pulse Jet and Premixed Ignition Combustion Performance of a Direct Injection Injector

Modeling Study of the Impact of Blending N₂, CO₂, and H₂O on Characteristics of CH₄ Laminar Premixed Combustion

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Laminar burning velocity and Markstein length of nitrogen diluted natural gas/hydrogen/air mixtures at normal, reduced and elevated pressures

Cited by 38 publications

References 29 publications

Shock Tube and Kinetic Study on the Effects of CO2 on Dimethyl Ether Autoignition at High Pressures

Shock Tube and Kinetic Study on the Effects of CO2 on Dimethyl Ether Autoignition at High Pressures

Experimental Research of High-Pressure Methane Pulse Jet and Premixed Ignition Combustion Performance of a Direct Injection Injector

Modeling Study of the Impact of Blending N2, CO2, and H2O on Characteristics of CH4 Laminar Premixed Combustion

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Product

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Shock Tube and Kinetic Study on the Effects of CO₂ on Dimethyl Ether Autoignition at High Pressures

Shock Tube and Kinetic Study on the Effects of CO₂ on Dimethyl Ether Autoignition at High Pressures

Modeling Study of the Impact of Blending N₂, CO₂, and H₂O on Characteristics of CH₄ Laminar Premixed Combustion