Showing papers on "Ignition system published in 2020"
TL;DR: In this article, an experimental study of a spark ignition engine with premixed ammonia/hydrogen/air mixtures is presented, showing that up to 20% hydrogen in the fuel by volume improves the cyclic stability and avoids misfires.
170 citations
TL;DR: In this article, the application of bio-butanol fuel in SI and CI engines is summarized and some suggestions for the future research and development direction of biobutanol engines are put forward in study.
143 citations
TL;DR: In this article, an H2 port-injection and methanol directinjection dual-fuel SI engines were used to investigate the effect of the equivalence ratio on the combustion and emissions characteristics of the engine at low speed.
130 citations
TL;DR: In this article, a review report summarizes the investigations carried out by the researchers on addition of various alcohols with diesel and biodiesel in different diesel engines and their impact on compression ignition engine performance, combustion and emission characteristics have also been studied.
127 citations
TL;DR: In this paper, the authors used a medium compression ratio of port injection-type hydrogen/direct-injection methanol to investigate the combustion and lean-burn limit under different ratios of addition of hydrogen, excess air ratios, and ignition timings based on methanoline late injection.
114 citations
TL;DR: In this paper, the authors compared the performance of single-and dual-fueled ACTs, such as homogeneous charge compression ignition (HCCI), PCCI and DF-PCCI, under a specified load condition at which all ACTs can be operated stably.
93 citations
TL;DR: In this paper, five different spray-line distribution nozzles were designed to evaluate the effect of the nozzle spray line distribution on stratified charge combustion of methanol engine.
90 citations
TL;DR: In this article, the emissions and performance characteristics of four-stroke, single-cylinder, water-cooled, diesel engine fueled with different blends of Rice bran biodiesel and octanol ble...
Abstract: In this present study, the emissions and performance characteristics of four-stroke, single-cylinder, water-cooled, diesel engine fueled with different blends of Rice bran biodiesel and octanol ble...
83 citations
TL;DR: In this article, the authors investigated the effect of turbulence on the explosion process of a methane-air mixture under standard conditions, and the effect on explosion parameters, i.e., pmax, τe, and (dp/dt)max, was investigated by the turbulence produced by three different inert additives.
80 citations
TL;DR: In this article, a direct dual fuel stratification (DDFS) combustion mode is investigated by directly injecting methanol and diesel into cylinder, and a multi-objective optimization and detailed comparison are first conducted for the two engine strategies.
76 citations
TL;DR: In this paper, a comparative investigation of engine combustion, performance and emission characteristics of low temperature combustion modes namely premixed charge compression ignition (PCCI) and reactivity controlled compression ignition with conventional compression ignition combustion mode was performed.
TL;DR: Experimental results revealed that duel fuelling ethyne gas to base fuel (C100) at 6 lpm reduce 18.1% CO, 9.7% HC, 6.87% Smoke with 11.2% increase in NOx emissions.
Abstract: This study is intended to examine the ignition characteristics of a cashew nut shell biodiesel (C100) along with ethyne (acetylene) as a dual fuel in a diesel engine. Cashew nut shell oil is employ...
TL;DR: In this article, a review of the technologies for syngas production, a detailed analysis of different applications of this gaseous fuel is presented and discussed, and the performance and the emissions of such engines are carefully analysed and discussed.
TL;DR: In this article, the Taguchi L16 approach was designed according to the combinations of the array, including load, hydrogen, multiwall carbon nanotubes (MWCNTs), ignition pressure, and timing with four optimal conditions.
TL;DR: In this paper, the effect of adding functionalized fluorine-containing organic substances (FCOS) to aluminized solid propellants was investigated, focusing on the oxidation and ignition characteristics of Al-FCOS composite particles.
TL;DR: In this article, a numerical simulation method was used to study the feasibility of in-cylinder direct water injection technology to weaken the knock tendency of a turbocharged direct injection gasoline (GDI) engine and improve its combustion emission performance.
TL;DR: In this article, a multi-channel gliding arc (MCGA) plasma was used to enhance ignition and combustion of ethylene fuel in a cavity-based scramjet combustor with an inflow speed of Ma − 2.92.
TL;DR: In this article, the influence of pressure on the combustion characteristics (i.e., ignition, volatiles combustion, char combustion) of a single lignite particle was investigated in a pressurized visualized fluidized bed combustor under O 2 N 2 and O 2 CO 2 atmospheres.
TL;DR: In this article, a prospective experiment of methanol-biodiesel dual fuel in intelligent charge compression ignition (ICCI) mode was conducted to study the effects of fuel injection strategies on engine combustion and emissions.
TL;DR: In this paper, the authors examine the injection, spray, combustion, and exhaust emission characteristics of a GDI engine with a multi-hole injector and describe the characteristics that make alcohol fuels useable in GDI engines.
TL;DR: A double-cone ignition (DCI) scheme, in which two head-on gold cones are used to confine deuterium–tritium shells imploded by high-power laser pulses, which shows that the implosion inside the head- on cones can greatly mitigate the energy requirement for compression.
Abstract: While major progress has been made in the research of inertial confinement fusion, significant challenges remain in the pursuit of ignition. To tackle the challenges, we propose a double-cone ignit...
TL;DR: In this paper, the authors compared the combustion, performance, and emission characteristics of B30, E30, ABE30 (i.e., 30 vol.% n-butanol, ethanol, and ABE blended with 70 VOL.% gasoline), and G100 (pure gasoline) at stoichiometric conditions.
Abstract: Ethanol is the most extensively used oxygenate for spark ignition (SI) engines. In comparison with ethanol, n-butanol exhibits a number of desirable properties for use in SI engines, which has proved to be a very promising oxygenated alternative fuel in recent years. However, the dehydration and recovery of bio-n-butanol consume extra money and energy in the acetone-n-butanol-ethanol (ABE) fermentation process. Hence, we focus on the research of ABE as a potential oxygenated alternative fuel in SI engines. The combustion, performance, and emission characteristics of B30, E30, ABE30 (i.e., 30 vol.% n-butanol, ethanol, and ABE blended with 70 vol.% gasoline), and G100 (pure gasoline) were compared in this study. The comparison results between B30, E30, and ABE30 at stoichiometric conditions show that ABE30 presents retarded combustion phasing, higher brake thermal efficiency, lower CO emissions, higher UHC emissions, and similar NOx emissions. In comparison with G100 under various engine loads and equivalence ratios, for the most part, ABE30 exhibits 1.4% higher brake thermal efficiency, 14% lower carbon monoxide, 9.7% lower unburned hydrocarbons, and 23.4% lower nitrogen oxides. It is indicated that ABE could be served as the oxygenate in spark ignition engine due to its capability to improve energy efficiency and reduce pollutant emissions.
TL;DR: In this paper, the effect of excess air ratio (λ) and ignition advance angle (θig) on the combustion and emission characteristics of hydrogen enriched compressed natural gas (HCNG) engine has been experimental studied in an engine test bench, aiming at enriching the sophisticated calibration of HCNG fueled engine and increasing the prediction accuracy of the SVM method on automobile engines.
TL;DR: In this paper, the thermodynamic conditions and transfer processes of magnesium alloys ignition are analyzed from the point of mechanisms, and a more suitable method to assess the potential ignition and flammability risks of Mg alloys in extreme environments is recommended.
TL;DR: In this paper, the potential of ammonia as a fuel for spark-ignition engines is discussed, thanks to the studies carried out so far and to point out directions for future work.
Abstract: Faced with the problem of reducing greenhouse gas emissions and transitioning toward a greater use of renewable energies, ammonia, as an energy carrier, is increasingly seen as a potential ‘green’ fuel for transportation, in particular marine applications. However, its combustion characteristics (high minimum ignition energy and auto-ignition temperature, low combustion speed in comparison to usual hydrocarbon fuels) are drawbacks that have so far limited its use. Due to the evolution of different pollutant standards for road transportation, Spark-Ignition engines and thus the combustion process itself have been subjected to many changes over the last 20 years (e.g., gasoline direct injection, downsizing). The objective of this article is to discuss the potential of ammonia as a fuel for spark-ignition engines thanks to the studies carried out so far and to point out directions for future work.
TL;DR: In this article, a finite-rate chemistry large-eddy simulation (LES) solver is utilized to investigate dual-fuel (DF) ignition process of n-dodecane spray injection into a methane-air mixture at engine-relevant ambient temperatures.
TL;DR: In this article, the authors investigated the burnout characteristics of semi-coke and bituminous coal blends by thermogravimetric analyzer and drop tube furnace, and found that the ignitability index and the comprehensive combustion characteristic index of the blends decrease as the blending proportion of semi coke increases, but the average activation energy increases gradually.
Abstract: Ignition and burnout characteristics of semi-coke and bituminous coal blends were investigated by thermogravimetric analyzer and drop tube furnace. The results showed that the ignitability index and the comprehensive combustion characteristic index of the blends decrease as the blending proportion of semi-coke increases, but the average activation energy of the blends increases gradually. Ignition mode of bituminous coal is changed from homogeneous to hetero-homogeneous ignition with the increasing of semi-coke content in the blends. When the mixing proportion of semi-coke is lower than 45%, the burnout rate is lower than the weighted value in the early stage of combustion and gradually higher than the weighted value with the development of combustion process. However, the burnout is always lower than the weighted value to mix with 67% semi-coke. Increasing furnace temperature from 850 °C to 1050 °C can improve the mid-term reaction process, alleviate the negative effects of semi-coke on the co-combustion process and increase the burnout rate. So less than 45% semi-coke blending ratio and increasing furnace temperature are recommended for semi-coke and bituminous coal co-combustion.
TL;DR: In this article, the effects of injection pressure on the impinging spray and ignition characteristics of the heavy-duty diesel engine with a 0.32mm nozzle were measured visually in a constant volume combustion chamber using Mie-scattering, shadowgraph, and direct photography methods.
TL;DR: In this article, three-dimensional CFD simulations were implemented and the numerical results were compared with existing measured data, in which hydrogen enrichment was achieved by hydrogen enrichment within the intake manifold of a spark-ignition Wankel engine.
TL;DR: In this paper, a carbon-oxygen core with a helium shell was set up in one dimension and mapped to three dimensions to simulate the influence of core-shell mixing on the carbon ignition mechanism.
Abstract: Sub-Chandrasekhar mass white dwarfs accreting a helium shell on a carbon-oxygen core are potential progenitors of normal Type Ia supernovae. This work focuses on the details of the onset of the carbon detonation in the double detonation sub-Chandrasekhar model. In order to simulate the influence of core-shell mixing on the carbon ignition mechanism, the helium shell and its detonation are followed with an increased resolution compared to the rest of the star treating the propagation of the detonation wave more accurately. This significantly improves the predictions of the nucleosynthetic yields from the helium burning. The simulations were carried out with the AREPO code. A carbon-oxygen core with a helium shell was set up in one dimension and mapped to three dimensions. We ensured the stability of the white dwarf with a relaxation step before the hydrodynamic detonation simulation started. Synthetic observables were calculated with the radiative transfer code ARTIS. An ignition mechanism of the carbon detonation was observed, which received little attention before. In this “scissors mechanism”, the impact the helium detonation wave has on unburnt material when converging opposite to its ignition spot is strong enough to ignite a carbon detonation. This is possible in a carbon enriched transition region between the core and shell. The detonation mechanism is found to be sensitive to details of the core-shell transition and our models illustrate the need to consider core-shell mixing taking place during the accretion process. Even though the detonation ignition mechanism differs form the converging shock mechanism, the differences in the synthetic observables are not significant. Though they do not fit observations better than previous simulations, they illustrate the need for multi-dimensional simulations.