Computational combustion and emission analysis of hydrogen–diesel blends with experimental verification

Masood, M.; Ishrat, M.M.; Reddy, A.S.

doi:10.1016/j.ijhydene.2006.11.008

Cited by 111 publications

(36 citation statements)

References 12 publications

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“…The methodology followed originates from the work of Abraham et al [30], which has gone through some major improvements ever since [31] and has been also extended to other types of engines [32,33]. Recently, it has been formulated for the simulation of hydrogen-fueled spark-ignition engines and validated against experimental data, while further details concerning the calculation of the reaction rates with the use of the characteristic conversion time-scale method can be found in Ref.…”

Section: Reaction Rate Calculationmentioning

confidence: 99%

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

Rakopoulos

Kosmadakis

Demuynck

et al. 2011

International Journal of Hydrogen Energy

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A COMBINED EXPERIMENTAL AND NUMERICAL STUDY OF THERMAL PROCESSES, PERFORMANCE AND NITRIC OXIDE EMISSIONS IN A HYDROGEN-FUELED SPARK-IGNITION ENGINE ABSTRACTThis work concerns the study of a spark-ignition engine fueled with hydrogen, using both measured and numerical data at various conditions, focusing on the combustion efficiency, the heat transfer phenomena and heat loss to the cylinder walls, the performance, as well as the nitric oxide (NO) emissions formed, when the fuel/air and compression ratio are varied. For the investigation of the heat transfer mechanism, the local wall temperatures and heat flux rates were measured at three locations of the cylinder liner in a CFR engine. These fluxes can provide a reliable estimation of the total heat loss through the cylinder walls and of the hydrogen flame arrival at specific locations. Together with the experimental analysis, the numerical results obtained from a validated in-house CFD code were utilized for gaining a more complete view of the heat transfer mechanism and the hydrogen combustion efficiency for the various cases examined. The performance of the CFR engine is then identified, since the calculated cylinder pressures are compared with the measured ones, from which performance and heat release rates are calculated and discussed. Further, NO emission studies have been accomplished, with the calculated results not only being compared with the measured exhaust NO ones, but also further processed for conducting an in-depth investigation of the dependence of NO production on the spatial distribution of in-cylinder gas temperature. It is revealed that for lower fuel/air ratio the burned gas temperature is held at low level and the heat loss ratio is quite low. As the load increases and stoichiometric mixtures are used, the wall and in-cylinder gas temperatures increase substantially, together with the heat loss and the NO emissions, owing to the high hydrogen combustion velocity and the consequent high rate of temperature rise. The combustion efficiency is slightly increased, but the indicated efficiency is decreased due to higher heat loss.Keywords: hydrogen; spark-ignition engine; combustion efficiency; heat transfer; NO emissions.

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Section: Reaction Rate Calculationmentioning

confidence: 99%

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

Rakopoulos

Kosmadakis

Demuynck

et al. 2011

International Journal of Hydrogen Energy

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“…The high flame speeds are a result of the fast and thermally neutral branching chain reactions of H2 as compared to the relatively slower endothermic and thermally significant chain reactions associated with hydrocarbon fuel combustion [15]. Also Heat release rates from H2-diesel fuel combustion tend to be higher than those for diesel fuel combustion, resulting in a shorter duration of combustion with less heat transfer to the surroundings, and can improve thermal efficiencies [16][17][18].…”

Section: Engine Performance With Variable Field Voltage and Constant mentioning

confidence: 99%

Optimization of oxyhydrogen gas flow rate as a supplementary fuel in compression ignition combustion enginess

Sakhrieh¹,

Al-Hares²,

Faqes³

et al. 2017

IJHT

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In this study, Oxyhydrogen (HHO) gas produced by electrolysis process using Potassium hydroxide (KOH) was introduced as a supplementary fuel into a four-cylinder, four -stroke Compression Ignition (CI) engine. In the first part, the throttle of the engine is held to its full, half and quarter position. The field voltage (brake load) is varied to obtain different engine speeds. In the second part, the field voltage of the electric dynamometer is held constant while the throttle of the engine is varied. Power, torque, Brake Specific Fuel Combustion (BSFC) and efficiency improvements depend on the HHO gas flow rate supplied to the engine and can be enhanced by 14.2, 4.8, 10.6 and 8.8 percent, respectively. A curve that relates engine speed with the optimum HHO gas flow rate was plotted to maximize the enhancement of the engine performance. Optimum HHO gas flow rate depends on the engine speed; being 1.4 L/min at low speeds, and increases with speed increase to reach 2.1 L/min at intermediate speeds, while at high speeds, to maximize the enhancement of power and torque, it is recommended to mix diesel with HHO flow rate of 3.0 L/min.

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“…The pure diesel case is operated under air-fuel ratio of 17. It is necessary to mention that oxygen added with gaseous fuel mixture is considered as part of the fuel mass as shown in equation (3). The air-fuel ratio has non-monotonic relation with flow rates of gaseous fuel.…”

Section: Engine Performance Under Different Hydrogen To Diesel Mass Rmentioning

confidence: 99%

“…Adding hydrogen to diesel engine that operate primary by combusting diesel fuel has showed a significant improvement in engine efficiency (around 20%) [2] when compared to pure diesel combustion and an increase of 13% in NOx emission. Masood et al [3] reported a brake thermal efficiency of 30% when hydrogen is used in the dual fuel mode with diesel at a compression ratio of 24.5. Lee et al [4] studied the performance of dual hydrogen-diesel fuel engine by using solenoid in-cylinder injection and external fuel injection technique.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Supporting Diesel Engine Using Solar–Hydrogen Energy Cycle

Hamdan

2015

MATEC Web of Conferences

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Abstract.This experimental study evaluates the feasibility of supporting compression ignition engine that primary run on diesel fuel with hydrogen gas that is produced by solar-hydrogen cycle. A photovoltaic panel is used to produce hydrogen through electrolysis from solar energy. Different mass ratio of hydrogen enrichment to liquid diesel fuel are tested on an engine operating under fixed torque of 14.7 N-m and engine rotational speed of 1100 rpm. Under same loading condition, the study shows that hydrogen can be used to reduce diesel fuel consumption and CO2 emission however this comes on the cost of increasing of NOx emission. The results show that beyond a maximum mass ratio of hydrogen-to-diesel of 9.7%, the engine starts knocking. The experiment shows that adding hydrogen to the air intake of a diesel requires a simple pluming operation in which hydrogen is allowed to enter the engine from the air intake manifold and hence the cost of retrofitting of current diesel engine is considered marginal.

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Computational combustion and emission analysis of hydrogen–diesel blends with experimental verification

Cited by 111 publications

References 12 publications

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

Optimization of oxyhydrogen gas flow rate as a supplementary fuel in compression ignition combustion enginess

Feasibility of Supporting Diesel Engine Using Solar–Hydrogen Energy Cycle

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