Exergy losses in auto-ignition processes of DME and alcohol blends

Zhang, Jiabo; Huang, Zhen; Han, Dong

doi:10.1016/j.fuel.2018.04.162

Cited by 23 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, inappropriate selection of the time step length might lead to calculation errors, as the changes in thermodynamic states within the time step might not be negligible. 7,9 Hence, the irreversibility calculated by these two methods were compared after each time step to make sure the relative error is below 0.1%. Otherwise, reduced time step was used until the convergence was achieved.…”

Section: Methodsmentioning

confidence: 99%

“…Zhang et al 8 classified the overall chemical reactions in the fuel kinetic mechanisms into four stages and evaluated the dilution, thermal and chemical effects of carbon dioxide addition on the exergy losses in each reaction stage. Moreover, Zhang et al 9 studied the exergy losses in the autoignition process of dimethyl ether (DME) and alcohols blends. By analyzing the interaction effects between the reaction kinetics of alcohols and DME, they found that methanol addition was more effective than ethanol in extending the area of the minimum exergy losses.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of mechanism reduction on the exergy losses analysis in n-heptane autoignition processes

Zhang

Huang

Han

2019

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

Exergy analysis in the n-heptane autoignition process was numerically conducted in an adiabatic constant-volume system with the detailed, skeletal and reduced n-heptane chemical mechanisms. The results revealed that the top five contributors to the system entropy change are N2, CO2, H2O, O2 and n-heptane at all cases. The relative errors of the exergy losses by chemical reactions calculated by the three mechanisms were less than 1% for all the initial conditions, indicating that mechanism reduction does not significantly influence the calculation results of the exergy losses by chemical reactions. However, the calculation results of the exergy losses by incomplete combustion products were less convinced by the skeletal and reduced mechanisms, with the relative error up to 3.45%. However, the overall satisfactory agreement of the total exergy losses calculated by different mechanisms suggested that the skeletal and reduced mechanisms might be suitable for the exergy efficiency calculation in engine combustion simulation. Furthermore, reactions in the mechanisms were classified to eight classes according to the carbon chain length. It was observed that the skeletal and reduced mechanisms overestimated the exergy losses by the C0–C1 reactions but underestimated the exergy losses by the C2 reactions. The calculated exergy losses of the C7 reactions were relatively consistent when the detailed, skeletal and reduced mechanisms were used.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of mechanism reduction on the exergy losses analysis in n-heptane autoignition processes

Zhang

Huang

Han

2019

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…Because it includes oxygen, lowers PM emissions, and is renewable, alcohol is regarded as a superior diesel addition. Biofuels such as alcohols can be derived from biomass resources, which are renewable and offer a potentially limitless supply of feedstock . Over the past 10 years, multiple investigations have focused on methanol and ethanol, with particular attention paid to their spraying.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effect of Graphene Oxide in Higher Alcohol Blends and Optimization of Injection Timing Using an ANN Method

Natarajan,

Kandasamy,

Perumal Venkatesan

et al. 2023

ACS Omega

View full text Add to dashboard Cite

The use of alternative fuels in diesel engines has become more widespread due to a number of factors, including dwindling petroleum supplies, increasing prices for conventional fossil fuels, and environmental worries about pollutants and greenhouse gas emissions from internal combustion engines. Efficiency and emissions need to be appropriately balanced. Alcohols act as oxygenated fuels similar to octanol, offering a number of benefits over traditional fuels and can boost efficiency, enhance combustion, and reduce air pollution. Therefore, the research aimed to enhance the performance and combustion characteristics of a diesel and octanol blend using graphene oxide (GO) nanoparticles as a fuel additive in a single-cylinder diesel engine while reducing emissions. Research findings will contribute significantly to improving the physical and chemical properties of diesel and octanol blends, thereby mitigating the challenges of limited petroleum reserves and environmental concerns. A range of different blends of diesel and octanol were prepared on a volume/volume basis in proportions of D70OCT30, D60OCT40, and D50OCT50, and then GO was added as a fuel additive to the abovementioned blends in varied proportions (40, 60, and 80 ppm) resulting in nine blends. These blends were analyzed in terms of various performance, combustion, and emission characteristics, and the obtained results helped to shed light on the impact of GO as a fuel additive. The results indicated that the fuel blend D70OCT30GO0.006 yielded the highest values. Furthermore, it is highly imperative that we develop a model that can be used to predict engine behavior and its stability without having to run an engine. For this, a data-driven artificial neural network (ANN) model was developed to predict the optimized injection timing for better combustion and reduced emission. The efficiency and prediction capabilities of the model were compared to the experimental data, which indicated that the ANN model had a better prediction score. The injection timing of the engine was optimized from 21 °CA to 21.5 °CA, which increased the efficiency by 1%. The research findings showed significantly improved physical and chemical properties of the blends, thereby mitigating the challenges of limited petroleum reserves and environmental concerns.

show abstract

“…2,3 As a result, biofuels are considered to be used as partial displacers or additives for the petroleum-based transportation fuels. 4,5 Among different biofuels, esters usually have higher heating values, higher lubricity, and higher oxygen content. 6,7 Such particular advantages make them suitable fuels for combustion engines, and attract many interests to understand their combustion characteristics and mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Influences of C5 esters addition on anti-knock and auto-ignition tendency of a gasoline surrogate fuel

Liang

Duan

Fan

et al. 2021

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

The research octane numbers and auto-ignition characteristics of a toluene primary reference fuel (TPRF), when blended with three C5 esters, γ-valerolactone (GVL), methyl butanoate (MB), and methyl crotonate (MC), were investigated on a cooperative fuel research (CFR) engine and a constant volume combustion chamber (CVCC). In fuel preparation, ethanol was used to improve the miscibility, and the total additive comprised 1/3 ethanol and 2/3 GVL/MB/MC on a molar basis. The experimental results first reveal that the addition of the three series of additives boost fuel octane rating, and their boosting effects rank as MB > GVL ∼ MC when fuels are blended on a molar basis. In contrast, the auto-ignition tendency of the three series of fuel blends, when blended on the molar basis, ranks as the MC blends > the GVL blends> the MB blends. Different from the similar reactivities observed for the MC blends and the GVL blends in the RON tests, the MC blends exhibit higher auto-ignition propensity than the GVL blends, probably because the higher enthalpy of vaporization of GVL causes a more significant cooling effect. Finally, different from the literature studies that reported similar reactivities for pure MB and MC, in this study MB shows lower reactivity than MC when blending with the TPRF gasoline surrogate.

show abstract

Exergy losses in auto-ignition processes of DME and alcohol blends

Cited by 23 publications

References 31 publications

Effects of mechanism reduction on the exergy losses analysis in n-heptane autoignition processes

Effects of mechanism reduction on the exergy losses analysis in n-heptane autoignition processes

Experimental Investigation on the Effect of Graphene Oxide in Higher Alcohol Blends and Optimization of Injection Timing Using an ANN Method

Influences of C5 esters addition on anti-knock and auto-ignition tendency of a gasoline surrogate fuel

Contact Info

Product

Resources

About