Development and verification of a reduced dimethoxymethane/n-heptane/toluene kinetic mechanism and modelling for CI engines

Shi, Xiuyong; Qian, Weiwei; Wang, Haoyu; Pan, Mingzhang; Wang, Qiwei; Ni, Jimin

doi:10.1016/j.applthermaleng.2022.118855

Cited by 6 publications

(4 citation statements)

References 95 publications

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“…However, integrating a detailed kinetic mechanism with a comprehensive physical model of soot nucleation, oxidation, aggregation, fragmentation, and other processes demands substantial computational resources. Moreover, errors may arise in intermediate processes due to an excess or insufficient amount of a specific chemical component. Simplifying the detailed model could lead to excessive errors in predicting the laminar flame speed, species concentration, and ignition delay time, compromising the accuracy of chemical reaction kinetics. , Hence, there is a need for a chemical kinetics model that can be coupled with the physical process of soot generation, suitable for multidimensional simulation, and capable of accurately reappearing laminar flame speed, ignition delay time, and species concentration. Furthermore, studying the impact of ammonia on soot formation in coflow laminar flames typically involves three approaches.…”

Section: Introductionmentioning

confidence: 99%

“…Simplifying the detailed model could lead to excessive errors in predicting the laminar flame speed, species concentration, and ignition delay time, compromising the accuracy of chemical reaction kinetics. 31,32 Hence, there is a need for a chemical kinetics model that can be coupled with the physical process of soot generation, suitable for multidimensional simulation, and capable of accurately reappearing laminar flame speed, ignition delay time, and species concentration. Furthermore, studying the impact of ammonia on soot formation in coflow laminar flames typically involves three approaches.…”

Section: Introductionmentioning

confidence: 99%

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Physical and Chemical Effects of Ammonia on Gas Emissions and Soot Formation in Laminar Coflow Ethylene Diffusion Flames

Qian,

Shi,

2024

Energy Fuels

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As a noncarbon fuel, ammonia is being explored as a potential alternative. This study delves into the physical and chemical impacts of ammonia in laminar coflow ethylene diffusion flames. Initially, an experiment is conducted to scrutinize the flame characteristics, including temperature, in these flames. Subsequently, a new C 2 H 4 −NH 3 −PAH model is developed and verified through ignition delay times, laminar flame speeds, and species profiles. Building on this model, the study analyzes the physical and chemical effects of ammonia on temperature, gas emissions (CO, CO 2 , NO, NO 2 , HCN, and N 2 O), formation of polycyclic aromatic hydrocarbons (PAHs), and the nucleation, condensation, growth, and oxidation of soot in laminar coflow ethylene diffusion flames. The findings reveal that under constant ethylene flow rates the use of ammonia has minimal impact on flame temperature. Moreover, ammonia decreases CO and CO 2 emissions primarily due to its dilution effect. However, gas emissions such as NO, NO 2 , HCN, and N 2 O significantly increase due to the chemical effect of ammonia. Furthermore, soot precursors noticeably decrease with the addition of NH 3 because of the inhibition of PAH formation through ammonia's dilution effect. Nevertheless, the chemical effect of ammonia plays a counterproductive role in reducing precursor formation, resulting in increased emissions of precursors A1−A4 due to the decreased free radicals. In the assessment of the nucleation, condensation, growth, and oxidation of soot in laminar coflow ethylene diffusion flames, the study indicates a substantial drop (25.7%) in the inception rate of A60 compared to A0 when using ammonia. It is noteworthy that the primary reason for the reduced soot formation with ammonia lies in the decrease of the inception rate through the dilution effect of ammonia and the inhibition of the hydrogen abstraction carbon addition (HACA) surface growth rate because the chemical effect of ammonia reduces free radical H and CH 3 concentrations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physical and Chemical Effects of Ammonia on Gas Emissions and Soot Formation in Laminar Coflow Ethylene Diffusion Flames

Qian,

Shi,

2024

Energy Fuels

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“…For example, the European Union has set a 37.5% reduction in fuel consumption for passenger cars by 2030 compared to 2021. For the internal combustion engine itself, stringent emission regulations and rising fuel control requirements have prompted the internal combustion engine industry to develop more advanced technologies [5][6][7][8]. To achieve this goal, exhaust gas turbochargers, a key component of the internal combustion engine's air exchange system, could play a particularly important role.…”

Section: Introductionmentioning

confidence: 99%

A Study of Evaluation Method for Turbocharger Turbine Based on Joint Operation Curve

Yin

Fan

et al. 2022

Sustainability

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Turbochargers have evolved with the advancement of engine technology. In this study, we pro-posed a concept of joint operation, based on the operating characteristics of the compressor and turbine. Furthermore, a turbine evaluation method was proposed based on this concept, and an optimization application study of the turbine impeller blade number and turbine casing was con-ducted and verified. The results showed that the performance evaluation method based on the joint point could predict the optimization trend of turbine performance more accurately, the turbine output power optimized based on our new method evidently had advantages over the original turbine, and the joint point showed better overall performance. The original single-entry turbine could be optimized into a 9-blade twin-entry turbine having better response characteristics. The maximum torque of the optimized engine was 5.4% higher than that of the original engine, and the minimum brake specific fuel consumption (BSFC) was reduced by 2.1%. In the low and medium speed operating region, engine torque was increased by up to 3.2% and BSFC was reduced by up to 1.1% compared to the turbine optimized by conventional methods. Hence, the optimization effect of our new method was proven.

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“…The combustion mode of diesel engines can be classified into two categories: space diffusion combustion of the in-cylinder mixture and wall-film combustion of the liquid fuel, of which the former is the primary mode. 17 Therefore, the injection and atomization of the fuel within the cylinder play an important role in the quality of the combustion process of diesel engines. 18 However, there are few efforts and coherent information to date concerning the spray characteristics of the aforementioned oxygenated diesel fuels.…”

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confidence: 99%

Comparative experimental study on macroscopic spray characteristics of various oxygenated diesel fuels

Bao

Wang

et al. 2023

Energy Science & Engineering

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Under high ambient pressure (5 MPa) and different injection pressures (90, 120, and 150 MPa), a high‐speed imaging technique was carried out to comparatively investigate the macroscopic spray characteristics of diesel with three different types of blended fuel in a constant volume chamber. The oxygenated fuels were n‐butanol (B), pine oil (P), and 2,5‐dimethylfuran (DMF). All their blending ratio with diesel were 20%. Results showed that less viscosity could be improved the spray characteristics of the fuel in the range of experimental conditions. Then, the tested fuels had a longer penetration and a greater spray area with increasing the injection pressure from 90 to 150 MPa. On the other hand, the percentage increases in the mean spray cone angle of D100, B20, P20, and DMF20 were 3%, 4.4%, 2.4%, and 2.9%, respectively. At the same experimental condition, the spray penetrations of DMF20 and P20 were larger than that of D100, but the spray penetration of B20 was basically similar to D100. Besides, the performance of the spray cone angle and spray area were D100 < B20 < P20 < DMF20. In addition, the comprehensive influence was that blending oxygenated fuels would be a benefit for developing fuel atomization and the air–fuel mixture of conventional diesel fuel.

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Development and verification of a reduced dimethoxymethane/n-heptane/toluene kinetic mechanism and modelling for CI engines

Cited by 6 publications

References 95 publications

Physical and Chemical Effects of Ammonia on Gas Emissions and Soot Formation in Laminar Coflow Ethylene Diffusion Flames

Physical and Chemical Effects of Ammonia on Gas Emissions and Soot Formation in Laminar Coflow Ethylene Diffusion Flames

A Study of Evaluation Method for Turbocharger Turbine Based on Joint Operation Curve

Comparative experimental study on macroscopic spray characteristics of various oxygenated diesel fuels

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