Detailed influences of chemical effects of hydrogen as fuel additive on methane flame

Ying, Yaoyao; Liu, Dong

doi:10.1016/j.ijhydene.2015.01.076

Cited by 48 publications

(12 citation statements)

References 26 publications

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“…The higher temperature and significant composition of H 2 make the burned hot gas generated in pre-combustion chamber to have a close combustion characteristic with hydrogen fuel [27][28][29][30] (such as ignition delay time). So the burned hot gas generated in precombustion chamber can also be applied as fuel to achieve supersonic combustion beyond Mach 8 in scramjet due to its close combustion characteristic with hydrogen, making LOX/methane staged cycle LRE having a potentially important advantage to achieve a RBCC with unified single fuel of liquid methane.…”

Section: Analysis Of Lox/methane Liquid-rocket Engine (Lre)mentioning

confidence: 99%

Conceptual study of a dual-rocket-based-combined-cycle powered two-stage-to-orbit launch vehicle

Zhang

Wang

2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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The liquid oxygen/methane staged cycle liquid-rocket engine is one of the most potential rocket engines in the future for its higher performance, higher fuel density and reusable capacity. Two working states of this liquid-rocket engine named as full-load state and half-load state are defined in this paper. Based on this liquid-rocket engine, a dual-rocket-basedcombined-cycle propulsion system with liquid oxygen /air/methane as propellants is therefore proposed. The dualrocket-based-combined-cycle system has then five working modes: the hybrid mode, pure ejector mode, ramjet mode, scramjet mode and pure rocket mode. In hybrid mode, the booster and ejector rockets driven by the full-load liquidrocket engine work together with the purpose of reducing thrust demand on ejector rocket. In scramjet mode, the fuelrich burned hot gas generated by the half-load liquid-rocket engine is used as fuel, which is helpful to reduce the technical difficulty of scramjet in hypersonic speed. The five working modes of dual-rocket-based-combined-cycle are highly integrated based on the full-or half-load state of the liquid oxygen/methane staged cycle liquid-rocket engine, and the unified single type fuel of liquid methane is adopted for the whole modes. Then a preliminary design of a horizontal takeoff two-stage-to-orbit launch vehicle is conducted based on the dual-rocket-based-combined-cycle propulsion system. Under an averaged baseline thrust and specific impulse, the launch trajectory to reach a low Earth orbit at 100 km is optimized via the pseudo-spectral method subject to maximizing the payload mass. It is shown that the two-stage-to-orbit vehicle based on the dual-rocket-based-combined-cycle can achieve the payload mass fraction of 0.0469 and 0.0576 for polar mission and equatorial mission, respectively. Conclusively, insights gained in this paper can be usefully applied to a more detailed design of the dual-rocket-based-combined-cycle powered two-stage-to-orbit launch vehicle.

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Section: Analysis Of Lox/methane Liquid-rocket Engine (Lre)mentioning

confidence: 99%

Conceptual study of a dual-rocket-based-combined-cycle powered two-stage-to-orbit launch vehicle

Zhang

Wang

2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Natural gas (NG) is one of the suitable fuels for IC engines operation due to its affordable prices and reasonable heating values, but it has many limitations when compared to other fossil fuels. For instance, low combustion efficiency and narrow flame propagation are examples of NG combustion limitations [6].…”

Section: Introductionmentioning

confidence: 99%

Influence of hydrogen as a fuel additive on combustion and emissions characteristics of a free piston engine

et al. 2020

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It has been shown that using fuel additives play an important role in enhancing the combustion characteristics in terms of efficiency and emissions. In addition, free piston engines have shown capable in reducing energy losses and presenting more efficient and reliable engines. In this context, the objective of the present work is to investigate the effect of using hydrogen as a fuel additive in natural gas homogeneous charge compression ignition free piston engine. To this aim, two models have been iteratively coupled: the combustion model that is used to calculate the heat release of the combustion and the scavenging model that is employed to determine the in-cylinder mixture state after scavenging in terms of its homogeneity and species mass fractions and to obtain the finial pressure and temperature of the in-cylinder mixture. In the former model, the 0-D approach through Cantera toolkit has been considered due to the fact that homogeneous charge compression ignition combustion is very rapid and the fuel-air mixture is well-homogenous, whereas in the latter model, 3-D-CFD approach through AN-SYS FLUENT software is considered to ensure precise calculations of the species exchange at the end of each engine cycle. The effect of hydrogen as a fuel additive has been quantified in terms of the combustion characteristics (e. g., ignition delay, heat release rate, engine overall efficiency and emissions, etc.). It has been shown that hydrogen addition reduces ignition delay time, decreases the incylinder peak pressure, while allowing the engine to operate with higher mechanical efficiency as it has high heat release rate, increases the NOx emission levels of the engine, but decreases the CO levels

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“…In particular, spark-ignition hydrogen-enriched natural gas engines have been widely studied. The effects of hydrogen addition on both the fundamental combustion properties of premixed methane/air mixtures − and natural gas engine performances and emissions have been extensively studied. − The kinetic influences of hydrogen addition on methane/air premixed flames have also been discussed. , However, fundamental studies focusing on the influence of hydrogen addition on the quenching distance of premixed flames are rather scarce. As far as the authors are aware, the only work was conducted by Fukuda and co-workers who experimentally measured the quenching distances of CH 4 /H 2 /air premixed flames.…”

Section: Introductionmentioning

confidence: 99%

“…31−33 The kinetic influences of hydrogen addition on methane/air premixed flames have also been discussed. 34,35 However, fundamental studies focusing on the influence of hydrogen addition on the quenching distance of premixed flames are rather scarce. As far as the authors are aware, the only work was conducted by Fukuda and coworkers 36 who experimentally measured the quenching distances of CH 4 /H 2 /air premixed flames.…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydrogen Addition on the Standoff Distance of Premixed Burner-Stabilized Flames of Various Hydrocarbon Fuels

Yan

Wang

2018

Energy Fuels

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The quenching distance of premixed hydrocarbon flames is of significant importance for studying flame/wall interactions and for understanding the unburned hydrocarbon emissions of internal combustion engines. Motivated by the fact that the standoff distance of premixed burner-stabilized flames could be used to investigate the behavior of head-on quenching distance of freely propagating flames despite the different physics involved, a parametric investigation on the standoff distances of methane, ethane, and propane burner-stabilized flames was conducted numerically using a detailed chemical kinetic mechanism, with a focus on the effects of hydrogen addition. Specifically, the minimum standoff distance was found to quantitatively correlate with the head-on quenching distance of premixed flames. The variations of the minimum standoff distance as a function of hydrogen fractions were then investigated in detail. The results showed that as hydrogen fraction increased, the minimum standoff distances decreased monotonously for all the hydrocarbon/air flames, with the reduction being most significant for methane fuel. Accompanying kinetic analysis showed that hydrogen addition enhances the heat release process, which promotes the reduction of minimum standoff distance. Subsequently, the dependences of the minimum standoff distance on fuel dilution, equivalence ratios, unburned gas temperatures, and pressures were explored. In addition, the potential to study the parametric dependence on unburned hydrocarbons emissions induced by near-wall flame quenching using the burner-stabilized flame model was discussed. The current study provides a useful approach to quantify the quenching distance of premixed flames, which has practical applications in internal combustion engines. Moreover, the dependence of standoff distance on hydrogen addition and other varying flame parameters can now be more fundamentally understood with the help of detailed chemical kinetics.

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Detailed influences of chemical effects of hydrogen as fuel additive on methane flame

Cited by 48 publications

References 26 publications

Conceptual study of a dual-rocket-based-combined-cycle powered two-stage-to-orbit launch vehicle

Conceptual study of a dual-rocket-based-combined-cycle powered two-stage-to-orbit launch vehicle

Influence of hydrogen as a fuel additive on combustion and emissions characteristics of a free piston engine

Effects of Hydrogen Addition on the Standoff Distance of Premixed Burner-Stabilized Flames of Various Hydrocarbon Fuels

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