Study on the Performance and Emissions of a Compression Ignition Engine Fuelled with Fischer-Tropsch Diesel Fuel

A mixture of n-dodecane and m-xylene is investigated as a diesel fuel surrogate for compression ignition (CI) engine applications. Compared to neat n-dodecane, this binary mixture is more representative of diesel fuel because it contains an alkyl-benzene which represents an important chemical class present in diesel fuels. A detailed multicomponent mechanism for n-dodecane and m-xylene was developed by combining a previously developed n-dodecane mechanism with a recently developed mechanism for xylenes. The xylene mechanism is shown to reproduce experimental ignition data from a rapid compression machine (RCM) and shock tube (ST), speciation data from the jet stirred reactor and flame speed data. This combined mechanism was validated by comparing predictions from the model with experimental data for ignition in STs and for reactivity in a flow reactor. The combined mechanism, consisting of 2885 species and 11,754 reactions, was reduced to a skeletal mechanism consisting 163 species and 887 reactions for 3D diesel engine simulations. The mechanism reduction was performed using directed relation graph (DRG) with expert knowledge (DRG-X) and DRG-aided sensitivity analysis (DRGASA) at a fixed fuel composition of 77% of n-dodecane and 23% m-xylene by volume. The sample space for the reduction covered pressure of 1–80 bar, equivalence ratio of 0.5–2.0, and initial temperature of 700–1600 K for ignition. The skeletal mechanism was compared with the detailed mechanism for ignition and flow reactor predictions. Finally, the skeletal mechanism was validated against a spray flame dataset under diesel engine conditions documented on the engine combustion network (ECN) website. These multidimensional simulations were performed using a representative interactive flame (RIF) turbulent combustion model. Encouraging results were obtained compared to the experiments with regard to the predictions of ignition delay and lift-off length at different ambient temperatures.

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Engine performance and emission characteristics of a compression ignition engine fuelled with diesel/dimethoxymethane blends

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1243/095440705x28367 ◽

2005 ◽

Vol 219 (7) ◽

pp. 905-914 ◽

Cited By ~ 18

Author(s):

Y Ren ◽

Z H Huang ◽

D M Jiang ◽

L X Liu ◽

K Zeng ◽

...

Keyword(s):

Thermal Efficiency ◽

Mass Fraction ◽

Volume Fraction ◽

Engine Performance ◽

Compression Ignition ◽

Compression Ignition Engine ◽

Performance And Emission ◽

Fuel Blends ◽

Performance And Emissions ◽

Combustion Phase

The performance and emissions of a compression ignition engine fuelled with diesel/dimethoxymethane (DMM) blends were studied. The results showed that the engine's thermal efficiency increased and the diesel equivalent brake specific fuel consumption (b.s.f.c.) decreased as the oxygen mass fraction (or DMM mass fraction) of the diesel/DMM blends increased. This change in the diesel/DMM blends was caused by an increased fraction of the premixed combustion phase, an oxygen enrichment, and an improvement in the diffusive combustion phase. A remarkable reduction in the exhaust CO and smoke can be achieved when operating on the diesel/DMM blend. Flat NO x/smoke and thermal efficiency/smoke curves are presented when operating on the diesel/DMM fuel blends, and a simultaneous reduction in both NO x and smoke can be realized at large DMM addition. Thermal efficiency and NO x give the highest value at 2 per cent oxygen mass fraction (or 5 per cent DMM volume fraction) for the combustion of diesel/DMM blends.

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Fuel Property Effects of a Broad Range of Potential Biofuels on Mixing Control Compression Ignition Engine Performance and Emissions

10.4271/2021-01-0505 ◽

2021 ◽

Author(s):

Jonathan L. Burton ◽

Jonathan A. Martin ◽

Gina M. Fioroni ◽

Teresa L. Alleman ◽

Cameron K. Hays ◽

...

Keyword(s):

Engine Performance ◽

Compression Ignition ◽

Compression Ignition Engine ◽

Fuel Property ◽

Performance And Emissions ◽

Mixing Control ◽

Engine Performance And Emissions

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Vibration Characteristics of Compression Ignition Engines Fueled with Blended Petro-Diesel and Fischer-Tropsch Diesel Fuel from Coal Fuels

Energies ◽

10.3390/en11082043 ◽

2018 ◽

Vol 11 (8) ◽

pp. 2043 ◽

Cited By ~ 3

Author(s):

Tiantian Yang ◽

Tie Wang ◽

Guoxing Li ◽

Jinhong Shi ◽

Xiuquan Sun

Keyword(s):

Diesel Fuel ◽

Pressure Oscillation ◽

Vibration Signal ◽

Vibration Characteristics ◽

Compression Ignition ◽

Fischer Tropsch ◽

Frequency Bands ◽

Transient Combustion ◽

Block Based ◽

Ci Engines

Fischer-Tropsch diesel fuel synthesized from coal (CFT) is an alternative fuel that gives excellent emission performance in compression ignition (CI) engines. In order to study the vibration characteristics, which are important for determining the applicability of the fuel, CFT-diesel blends were tested on a CI engine to acquire vibration signals from the engine head and block. Based on the FFT and continuous wavelet transformation (CWT) analysis, the influence of CFT on the vibration was studied. The results showed that the root mean square (RMS) values of the vibration signal decrease as the proportion of CFT in the blends increases. The CWT results indicated that the vibration energy areas motivated by the pressure shock of transient combustion were weak with increasing CFT proportion for the different frequency bands. The blend of 90% pure petro-diesel and 10% CFT registered the largest RMS value for piston side thrust response, and the RMS of high-frequency pressure oscillation response is greater than that of the main response of combustion, for FT30. Therefore, CFT has the potential to reduce the combustion vibration of the engine at all frequency bands, and there is a possibility that the proportion of blended fuel can be modified to satisfy the vibration characteristics requirements in different frequency bands.

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