Effects of second injection timing on combustion characteristics of the spark ignition direct injection gasoline engines with dimethyl ether enrichment in the intake port

Shi, Longxing; Ji, Changwei; Wang, Shuofeng; Su, Teng; Cong, Xiaoyu; Wei, Du; Tang, Chuanqi

doi:10.1016/j.energy.2019.05.056

Cited by 28 publications

(5 citation statements)

References 30 publications

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“…Combustion duration of this engine was short for medium engine speed conditions, which was consistent with Luo's research [38] where the combustion duration of a hydrogen fuelled turbocharged engine over 2000 RPM was slightly shorter than that of 1500 RPM. The combustion duration in the authors' work was shorter than reciprocating engines and Wankel engines fuelled with gasoline [58,59], which was mainly caused by hydrogen flame propagation speed. It was supported by the research based on a Wanke engine [59] that gasoline/hydrogen blends were burned out in 50º CA; however, it was more than 150º CA for gasoline fuel.…”

Section: Combustion Characteristicsmentioning

confidence: 68%

Numerical simulation on the combustion and NOx emission characteristics of a turbocharged opposed rotary piston engine fuelled with hydrogen under wide open throttle conditions

Gao

Xing

Tian

et al. 2021

Fuel

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Section: Combustion Characteristicsmentioning

confidence: 68%

Numerical simulation on the combustion and NOx emission characteristics of a turbocharged opposed rotary piston engine fuelled with hydrogen under wide open throttle conditions

Gao

Xing

Tian

et al. 2021

Fuel

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“…A decline in NO x and CO emissions and an improvement in combustion stability were noticed. Shi et al 34 . showed that a small quantity of 20% of dimethyl ether added to gasoline could enhance the inflammation strength of spark ignition engines.…”

Section: Introductionmentioning

confidence: 99%

“…A decline in NO x and CO emissions and an improvement in combustion stability were noticed. Shi et al 34 showed that a small quantity of 20% of dimethyl ether added to gasoline could enhance the inflammation strength of spark ignition engines. An examination by Lee et al 35 established that mixing liquefied petroleum gas (LPG) and DME increased engine load ranges.…”

mentioning

confidence: 99%

The effect of biogas and dimethyl ether on the thermal characteristics of a dual‐fuel diesel engine: A numerical study

Al‐Dawody,

Imtiaz,

Katbar

et al. 2023

Biofuels Bioprod Bioref

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This investigation used the Diesel‐RK simulation program to carry out a numerical analysis of the effects that dual‐fuel mixes have on the combustion, performance, and emissions of a dual‐fuel diesel engine. It applied the multizone combustion model, and the controlling equations were solved for each individual combustion region. The engine characteristics were examined under the following scenario: it was initially powered by single‐fuel regular diesel (DF), then it switched to dual‐fuel use with 20% biogas, and then it was changed again with the use of 30% dimethyl ether (DME). On this basis, the mentioned biogas and DME ratios were used. The results showed that combustion pressure for the operation of 30% DME and 20% biogas was reduced by 2.45% and 9.57%, respectively, with respect to diesel fuel alone. The Sauter mean diameter (SMD) of the droplets was reduced by 12.6% for 30% DME and 16.2% for 20% biogas. Heat release and brake thermal efficacy (BTE) were reduced slightly with the use of biogas or DME in comparison with DF. The brake‐specific fuel consumption (BSFC) increased by 15.27% and 8.34%, with 30% DME and 20% biogas respectively due to the difference in the energy content of the tested fuels. Nitrogen oxide emissions decreased by 2% and 28% for the operation of 30% DME and 20% biogas, respectively. The summary emission equation (SE), which describes the combination of NOx and PM emissions, decreased by 4.23% and 5.40% with 30% DME and 20% biogas respectively. Based on the results, this paper recommends the use of 20% biogas with diesel rather than 30% DME. The current findings matched well with other scientists' results.

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“…Variable fuel injection timing leads to a significant impact on the fuel spray, mixture formation, combustion, and emission characteristics of diesel engines, thus affecting the power output, economy, and emission performance. 15–17 Sayin and Canakci experimentally studied the effect of injection timing on the performance and emission characteristics of a naturally aspirated, single-cylinder diesel engine. 18 Their results showed that compared with the initial injection timing, advancing or delaying injection timing are not conducive to the brake thermal efficiency and brake specific fuel consumption of the engine.…”

Section: Introductionmentioning

confidence: 99%

Effect of injection position on fuel spray and mixture preparation of a free-piston linear engine generator

Yuan

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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Fuel spray and mixing in linear engines is coupled by dynamics, combustion, and gas exchange, which differs from that in conventional engines. This work presents a system simulation to reveal the multi-process coupling effect of injection position on the fuel spray and mixing of a free piston linear diesel engine (FPLE). A full-cycle fuel spray model which couples with dynamic, combustion, and gas exchange is established to predict the coupled effect on mixture formation. The results indicate that the variable injection position changes the FPLE motion through multi-process coupling effect, resulting in different boundary conditions for fuel spray and mixing. Relatively large injection advance position leads to more residual gas, fast speed, intense turbulence, low gas pressure, and temperature at the moment of injection for mixture formation. The earlier fuel injection generally makes the longer spray penetration, smaller Sauter mean diameter of droplets, less fuel impingement, faster fuel evaporation rate, and more evaporated fuel mass. However, too early injection does not support the above results. Suggesting that in order to achieve homogeneous combustion mode, the large injection advance position injection schedule operation is a good choice for the FPLE due to its long ignition delay duration for fuel atomization, evaporation, and mixing.

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Effects of second injection timing on combustion characteristics of the spark ignition direct injection gasoline engines with dimethyl ether enrichment in the intake port

Cited by 28 publications

References 30 publications

Numerical simulation on the combustion and NOx emission characteristics of a turbocharged opposed rotary piston engine fuelled with hydrogen under wide open throttle conditions

Numerical simulation on the combustion and NOx emission characteristics of a turbocharged opposed rotary piston engine fuelled with hydrogen under wide open throttle conditions

The effect of biogas and dimethyl ether on the thermal characteristics of a dual‐fuel diesel engine: A numerical study

Effect of injection position on fuel spray and mixture preparation of a free-piston linear engine generator

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