Experimental Investigation of Combustion Characteristics in a Heavy-Duty Compression-Ignition Engine Retrofitted to Natural-Gas Spark-Ignition Operation

Liu, Jinlong; Dumitrescu, Cosmin E.

doi:10.4271/2019-24-0124

Cited by 15 publications

(12 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Afterward, with the retarded SIT, the flame spread was ensured to dominate during the combustion event, preventing knocking, and meeting the safety margin design requirements. 1,8 After these evaluations, it was seen that the most suitable SIT was 710 CAD. With the change of SIT from 719.5 to 710 CAD, the GIP, IMEP, and ITE values increased by 17.75%, 18.4%, and 16.28%, respectively, while the GISFC value decreased by 15.05%.…”

Section: Engine Performance and Combustion Analysismentioning

confidence: 99%

“…They concluded that this difference was due to the piston geometry of the diesel engine, which divides the combustion into two in the bowl and in the squish zone. 7,8 Liu and Dumitrescu investigated the effects of ''Methane Number'' and ''Wobbe Index'' of the natural gas used after conversion from the diesel engine to spark ignition natural gas engine in 3-D numerically. While the compression ratio of the modeled engine was 13.3:1, analyzes were performed at full load at 900, 1300, 1700, and 2100 rpm.…”

Section: Introductionmentioning

confidence: 99%

“…7,[9][10][11][12][13][14][15] When the literature studies are examined in general, it is seen that studies are carried out in engines using natural gas at low compression ratios such as 11:1-16:1. [7][8][9][10][11][12][13][14][15][16][17][18][19] In this study, unlike other studies in the literature, three-dimensional numerical studies were carried out at high speed (2300 rpm) and under full load in an engine with a high compression ratio of 17.5:1 and a special combustion chamber design (stepped lip bowl). In the study, besides the performance and emission values, incylinder cold flow and combustion phenomena were investigated and the effects of bowl-in piston geometry on in-cylinder combustion characteristics were examined in detail.…”

Section: Introductionmentioning

confidence: 99%

“…7,9–15 When the literature studies are examined in general, it is seen that studies are carried out in engines using natural gas at low compression ratios such as 11:1–16:1. 7–19…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Spark ignition timing effects on a converted diesel engine using natural gas: A numerical study

Aktas

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

Since it is not expected to switch to fully electric and/or fuel cell vehicles in the near future, the search for alternative fuels for systems using internal combustion engines has accelerated. At the forefront of these studies is the use of natural gas instead of diesel fuel in on-road, off-road vehicles, or stationary power generation plants. Diesel engines with their special combustion chamber (i.e. bowl in-piston) can be converted to run entirely on natural gas by installing a natural gas fuel injector on the intake manifold and a spark plug instead of a diesel fuel injector. In this study, in-cylinder combustion characteristics, performance, and emission values for different Spark Ignition Time (SIT) of natural gas usage at 2300 rpm and full load in a tractor engine with a compression ratio of 17.5:1 were investigated numerically using ANSYS Forte three-dimensional analysis program. G-equation combustion model, RANS k-ε turbulence model, and methane chemical kinetic mechanism representing natural gas consisting of 29 species and 171 equations (a reduced mechanism) were used. First SIT was accepted as a 719.5 Crank Angle Degree (CAD) which is diesel injection start time. As a result, due to the special shape of the combustion chamber of diesel engines (re-entrant bowl in-piston), it was seen that the flame was faster and thicker in the bowl, while it was slower and thinner in the squish zone. With the advanced of SIT, the in-cylinder pressure ratio increased. By taking SIT too advanced (i.e. 690, 695, and 700 CAD SIT), more than one peak formation was observed in the heat release graph depending on the combustion characteristic. With the effect of both natural gas use and SIT, it was observed that HC and CO formations were almost not seen, while NOX formation remains above a certain level.

show abstract

Section: Engine Performance and Combustion Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…7,9–15 When the literature studies are examined in general, it is seen that studies are carried out in engines using natural gas at low compression ratios such as 11:1–16:1. 7–19…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spark ignition timing effects on a converted diesel engine using natural gas: A numerical study

Aktas

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…In this paper, a single-cylinder gasoline engine model was utilized to systematically analyze the effects of equivalence ratio measurement accuracy on engine efficiency and emissions at varied compression ratios. It is generally recognized that a higher compression ratio (CR) value is a benefit for improving thermal efficiency, increasing engine power output and reducing residual exhaust gas [36,37]. However, subject to the limits of detonation phenomenon and the increment of mechanical friction loss, the value of the compression ratio cannot be too high for spark ignition engines [38].…”

Section: Future Workmentioning

confidence: 99%

A Numerical Analysis of the Effects of Equivalence Ratio Measurement Accuracy on the Engine Efficiency and Emissions at Varied Compression Ratios

et al. 2021

View full text Add to dashboard Cite

Increasingly stringent regulations to reduce vehicle emissions have made it important to study emission mitigation strategies. Highly accurate control of the air-fuel ratio is an effective way to reduce emissions. However, a less accurate sensor can lead to reduced engine stability and greater variability in engine efficiency and emissions. Additionally, internal combustion engines (ICE) are moving toward higher compression ratios to achieve higher thermal efficiency and alleviate the energy crisis. The objective of this investigation was to analyze the significance of the accuracy of air-fuel ratio measurements at different compression ratios. In this study, a calibrated 1D CFD model was used to analyze the performance and emissions at different compression ratios. The results showed that carbon monoxide (CO) and nitrogen oxides (NOx) were sensitive to the equivalence ratio regardless of the compression ratio. With a slight change in the equivalence ratio, a high compression ratio had little effect on the change in engine performance and emissions. Moreover, with the same air-fuel ratio, an excessively high compression ratio (CR = 12) might result in knocking phenomenon, which increases the fluctuation of the engine output parameters and reduces engine stability. Overall, for precise control of combustion and thermal efficiency improvement, it is recommended that the measurement accuracy of the equivalence ratio is higher than 1% and the recommended value of the compression ratio are roughly 11.

show abstract

Study of hydrogen impact on lean flammability limit and burning characteristics of a kerosene surrogate

Akram

2021

Energy

View full text Add to dashboard Cite

Experimental Investigation of Combustion Characteristics in a Heavy-Duty Compression-Ignition Engine Retrofitted to Natural-Gas Spark-Ignition Operation

Cited by 15 publications

References 30 publications

Spark ignition timing effects on a converted diesel engine using natural gas: A numerical study

Spark ignition timing effects on a converted diesel engine using natural gas: A numerical study

A Numerical Analysis of the Effects of Equivalence Ratio Measurement Accuracy on the Engine Efficiency and Emissions at Varied Compression Ratios

Study of hydrogen impact on lean flammability limit and burning characteristics of a kerosene surrogate

Contact Info

Product

Resources

About