A study of the combustion and emission characteristics of compressed-natural-gas direct-injection stratified combustion using a rapid-compression-machine

Shiga, Seiichi; Ozone, S.; Machacon, Herchel Thaddeus; Karasawa, Takao; Nakamura, Hisao; Ueda, Takamasa; Jingu, Nobuhisa; Huang, Zuohua; Tsue, Mitsuhiro; Kono, Michikata

doi:10.1016/s0010-2180(01)00367-4

Cited by 98 publications

(42 citation statements)

References 7 publications

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“…This is also observed by many others [3,28,29]. The completeness of the combustion is also influenced by the equivalence ratio as is found by Shiga et al [30], investigating compressed-natural-gas direct-injection stratified combustion in a rapid compression machine. Shiga et al found that a higher equivalence ratio for a homogeneous mixture results into a higher combustion efficiency.…”

Section: The Effect Of the Equivalence Ratio On The Auto-ignition Prosupporting

confidence: 69%

An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine

Machrafi

Cavadiasa

2008

Fuel Processing Technology

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In order to understand better the auto-ignition process in an HCCI engine, the influence of some important parameters on the auto-ignition is investigated. The inlet temperature, the equivalence ratio and the compression ratio were varied and their influence on the pressure, the heat release and the ignition delays were measured. The inlet temperature was changed from 25 to 70 °C and the equivalence ratio from 0.18 to 0.41, while the compression ratio varied from 6 to 13.5. The fuels that were investigated were PRF40 and n-heptane. These three parameters appeared to decrease the ignition delays, with the inlet temperature having the least influence and the compression ratio the most. A previously experimentally validated reduced surrogate mechanism, for mixtures of n-heptane, iso-octane and toluene, has been used to explain observations of the auto-ignition process. The same kinetic mechanism is used to better understand the underlying chemical and physical phenomena that make the influence of a certain parameter change according to the operating conditions. This can be useful for the control of the auto-ignition process in an HCCI engine.

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Section: The Effect Of the Equivalence Ratio On The Auto-ignition Prosupporting

confidence: 69%

An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine

Machrafi

Cavadiasa

2008

Fuel Processing Technology

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“…The initial burned gas temperature uses the adiabatic flame temperature, and using a fourth-order Runge-Kutta scheme, the unknown variables in these thermodynamic equations mb, Tb, Tu, and dmb/dt can be obtained. During the combustion process, gas compositions and properties are calculated through chemical equilibrium with 11 species and seven equations [29].…”

Section: Calculation Of Heat Release Ratementioning

confidence: 99%

Effects of Electric Fields on the Combustion Characteristics of Lean Burn Methane-Air Mixtures

Fang

Duan

et al. 2015

Energies

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Abstract:In this work, the effects of the electric fields on the flame propagation and combustion characteristics of lean premixed methane-air mixtures were experimentally investigated in a constant volume chamber. Results show that the flame front is remarkably stretched by the applied electric field, the stretched flame propagation velocity and the average flame propagation velocity are all accelerated significantly as the input voltage increases. This indicates that the applied electric field can augment the stretch in flame, and the result is more obvious for leaner mixture. According to the analyses of the combustion pressure variation and the heat release rate, the peak combustion pressure Pmax increases and its appearance time tp is advanced with the increase of the input voltage. For the mixture of λ = 1.6 at the input voltage of −12 kV, Pmax increases by almost 12.3%, and tp is advanced by almost 31.4%, compared to the case of without electric fields. In addition, the normalized mass burning rate and the accumulated mass fraction burned are all enhanced substantially, and the flame development duration and the rapid burning duration are remarkably reduced with the increase of the input voltage, and again, the influence of electric field is more profound for leaner mixtures. The results can be explained by the electric field-induced stretch effects on lean burn methane-air mixture. OPEN ACCESSEnergies 2015, 8 2588

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“…According to Shiga et al (2002), improvement of NG injector nozzle holes geometries and understand of the processes in the engine combustion is a challenge because the compression-ignition combustion process is unsteady, heterogeneous, turbulent and three dimensional and exceedingly complex. In MPI NG engines, NG is injected by fuel nozzle injector via intake port into the combustion chamber and mixing with air must occur before ignition of the gas fuel.…”

Section: Multi Point Injection Gas Injectormentioning

confidence: 99%

Application of Natural Gas for Internal Combustion Engines

Bakar¹,

Kadirgama²,

Rahman³

et al. 2012

Advances in Natural Gas Technology

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A study of the combustion and emission characteristics of compressed-natural-gas direct-injection stratified combustion using a rapid-compression-machine

Cited by 98 publications

References 7 publications

An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine

An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine

Effects of Electric Fields on the Combustion Characteristics of Lean Burn Methane-Air Mixtures

Application of Natural Gas for Internal Combustion Engines

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