A skeletal mechanism for biodiesel-dimethyl ether combustion in engines

Wu, Gang; Wang, Xin; Abubakar, Shitu; Li, Yuqiang

doi:10.1016/j.fuel.2022.124834

Cited by 15 publications

(5 citation statements)

References 42 publications

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“…With the consumption of petroleum resources and the enhancement of environmental awareness, clean utilization of energy in internal combustion engines is becoming a significant issue [1,2]. Therefore, it is urgent to explore renewable alternative fuels such as nature gas [3], ammonia [4], hydrogen [5], methanol [6], and biodiesel [7]. The renewable oxygenated fuel polymethoxydimethyl ethers (PODE n ) are also considered as promising alternative fuels owing to their excellent combustion performance and low soot emissions [8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Premixed PODE3-4/CH4 Flames at Engine-Relevant Conditions

Leng,

Ji,

Zhang

et al. 2024

Fuels

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Polyoxymethylene dimethyl ether (PODEn, n ≥ 1) is a promising alternative fuel to diesel with higher reactivity and low soot formation tendency. In this study, PODE3-4 is used as a pilot ignition fuel for methane (CH4) and the combustion characteristics of PODE3-4/CH4 mixtures are investigated numerically using an updated PODE3-4 mechanism. The ignition delay time (IDT) and laminar burning velocity (LBV) of PODE3-4/CH4 blends were calculated at high temperature and high pressure relevant to engine conditions. It is discovered that addition of a small amount of PODE3-4 has a dramatic promotive effect on IDT and LBV of CH4, whereas such a promoting effect decays at higher PODE3-4 addition. Kinetic analysis was performed to gain more insight into the reaction process of PODE3-4/CH4 mixtures at different conditions. In general, the promoting effect originates from the high reactivity of PODE3-4 at low temperatures and it is further confirmed in simulations using a perfectly stirred reactor (PSR) model. The addition of PODE3-4 significantly extends the extinction limit of CH4 from a residence time of ~0.5 ms to that of ~0.08 ms, indicating that the flame stability is enhanced as well by PODE3-4 addition. It is also found that NO formation is reduced in lean or rich flames; moreover, NO formation is inhibited by too short a residence time.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Premixed PODE3-4/CH4 Flames at Engine-Relevant Conditions

Leng,

Ji,

Zhang

et al. 2024

Fuels

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“…The TBC engine has a lower BSFC and higher BTE due to the increase in the combustion chamber temperature. They found a 3–27% increase in the energy available in the exhaust gas in TBC engines, which can be utilized by turbochargers . The effect of TBC coating on the performance and emission characteristics of a diesel engine.…”

Section: Introductionmentioning

confidence: 99%

“…They found a 3–27% increase in the energy available in the exhaust gas in TBC engines, which can be utilized by turbochargers. 8 The effect of TBC coating on the performance and emission characteristics of a diesel engine. The engine cylinder heads, valves, and pistons are coated with 0.15 mm of a nickel–chrome–aluminum bond coat and 0.35 mm of YSZ.…”

Section: Introductionmentioning

confidence: 99%

Performance and Emission Analysis of Biodiesel Blends in a Low Heat Rejection Engine with an Antioxidant Additive: An Experimental Study

Venkatesan,

Rajendran,

Murugan

et al. 2023

ACS Omega

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The rapid depletion of crude oil and environmental degradation necessitate the search for alternative fuel sources for internal combustion engines. Biodiesel is a promising alternative fuel for compression ignition (CI) engines due to its heat content and combustion properties. Biodiesel blends are used in various vehicles and equipment, such as cars, trucks, buses, off-road vehicles, and oil furnaces. Biodiesel can reduce emissions from CI engines by up to 75% and improve engine durability due to its high lubricity. However, biodiesel has some drawbacks, including a performance reduction and increased nitrogen oxide emissions. Therefore, this study aims to investigate using environmentally available biodiesel in a low-heat rejection engine and an antioxidant additive to enhance the performance and reduce nitrogen oxide emissions. India currently has several biodiesel sources, including mango seed oil, mahua oil, and pongamia oil, which can be effectively utilized in CI engines by adding l-ascorbic acid. The experimental work involves a single-cylinder 4-stroke water-cooled direct injection CI engine with a power output of 5.2 kW. The engine’s cylinder head, piston head, and valves are coated with lanthanum oxide using the plasma spray coating technique, with a thickness of 0.5 mm. The coated and uncoated engines are tested with different proportions of mahua oil, mango seed oil, and pongamia oil. The results show that the engine’s performance is significantly improved compared to the baseline engine at all loads. Additionally, these biodiesels exhibit a notable reduction in nitrogen oxide emissions when combined with l-ascorbic acid.

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“…Numerous mechanisms of multicomponent diesel surrogate fuels have been developed. – CRECK Modeling has developed a series of reduced kinetic schemes of fossil and biomass fuels . The recent mechanism of diesel surrogates includes 201 species and 4240 reactions.…”

Section: Introductionmentioning

confidence: 99%

Development of a Skeletal Mechanism of a Four-Component Diesel Surrogate Fuel Using the Decoupling Method

Sun,

Shi,

et al. 2023

ACS Omega

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Alkylcyclohexanes with a long alkyl chain account for more than 30% of diesel fuel but seldom used in the oxidation mechanism of diesel surrogate fuel due to the lack of a reduced skeletal mechanism. Hence, a fourcomponent diesel surrogate fuel was developed with n-butylcyclohexane (NBCH) as the representative of alkylcyclohexanes with a long alkyl chain in real diesel. The surrogate fuel can reproduce the physicochemical characteristics of real diesel, especially the distillation range. The reduced mechanism of NBCH was developed, and the skeletal mechanism of the surrogate fuel was formulated including 80 species and 251 reactions based on the decoupling method. The mechanism was validated under a wide range of conditions with the experimental results of ignition delay time (IDT), laminar flame speed, and species concentrations of both pure components and diesel. The accuracy of the mechanism on the spray and ignition performance was further validated against the experimental data obtained in a constant volume combustion chamber system. The calculated results showed a satisfactory agreement, in which the maximum error of flame lift-off length is 7.82 mm and that of IDTs is 0.16 ms. It was proven that the mechanism is suitable to reproduce the physicochemical properties of diesel and further predict the diesel spray and ignition performance.

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A skeletal mechanism for biodiesel-dimethyl ether combustion in engines

Cited by 15 publications

References 42 publications

Numerical Study of Premixed PODE3-4/CH4 Flames at Engine-Relevant Conditions

Numerical Study of Premixed PODE3-4/CH4 Flames at Engine-Relevant Conditions

Performance and Emission Analysis of Biodiesel Blends in a Low Heat Rejection Engine with an Antioxidant Additive: An Experimental Study

Development of a Skeletal Mechanism of a Four-Component Diesel Surrogate Fuel Using the Decoupling Method

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