Mixture Formation Analysis of Polyoxymethylenether Injection

Peter, Andreas; Siewert, Brittany; Riess, Sebastian; Strauß, Lukas; Pastoetter, Christian; Wensing, Michael

doi:10.1615/atomizspr.2020035250

Cited by 10 publications

(6 citation statements)

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“…A detailed evaluation of the mass rates and the injected masses as shown in Figure 6 is not presented in order to not exceed the scope of this paper. However, significant findings can be found at (Peter et al, 2020).…”

Section: Frontiers In Mechanical Engineeringmentioning

confidence: 89%

Mixture formation of OME3−5 and 1-Octanol in comparison with diesel-like Dodecane under ECN Spray A conditions

2023

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In order to be able to use the full potential of regenerative fuels, a comprehensive characterization is necessary to identify the differences between conventional fuels and regenerative fuels. In the current work, we compare OME3−5 and 1-Octanol with diesel-like Dodecane in terms of mixture formation under ECN Spray A conditions for single and multi-injection. To determine the mixtures, i.e., the mass distribution and the resulting air-fuel equivalence ratio, Naber and Siebers’ model as well as Musculus and Kattke’s model are used, which are based on experimental data. For this work, the mass flow rates and also the liquid and gaseous penetration depths of the fuel spray are measured. Results show that the mass ratios for the quasi-steady state of a single main injection for all three fuels are nearly the same, whereas the air-fuel equivalence ratios are very different. In addition, multiple injections are used to show that the fuel influences the opening and closing behavior of the injector. In the transient case of multiple injections, completely different mixtures result. In summary, it can be stated that OME3−5 and also 1-Octanol show a clearly different physio-chemical behavior from Dodecane and cannot simply be used as a drop-in fuel. Therefore, a simple exchange is not possible without major adaptations.

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Section: Frontiers In Mechanical Engineeringmentioning

confidence: 89%

Mixture formation of OME3−5 and 1-Octanol in comparison with diesel-like Dodecane under ECN Spray A conditions

2023

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“…The SprayA3 injector is characterized by unsteady behavior even between the ramp-up and ramp-down transients. Therefore, the standardized method published by the Polytechnical University of Valencia [28] was used to generate the injection rates for SprayA3 injector. The generated rates for the CFD calculations clearly show a faster ramp-up and ramp-down than the profiles The most challenging aspect is the adequate modeling of the highly transient pilot injection for the multiinjection operating point (OP4, Table 4).…”

Section: Submodelsmentioning

confidence: 99%

Numerical study of novel OME1−6 combustion mechanism and spray combustion at changed ambient environments

Wiesmann,

Qiu,

Han

et al. 2024

Front. Energy

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For a climate-neutral future mobility, the so-called e-fuels can play an essential part. Especially, oxygenated e-fuels containing oxygen in their chemical formula have the additional potential to burn with significantly lower soot levels. In particular, polyoxymethylene dimethyl ethers or oxymethylene ethers (PODEs or OMEs) do not contain carbon-carbon bonds, prohibiting the production of soot precursors like acetylene (C2H2). These properties make OMEs a highly interesting candidate for future climate-neutral compression-ignition engines. However, to fully leverage their potential, the auto-ignition process, flame propagation, and mixing regimes of the combustion need to be understood. To achieve this, efficient oxidation mechanisms suitable for computational fluid dynamics (CFD) calculations must be developed and validated. The present work aims to highlight the improvements made by developing an adapted oxidation mechanism for OME1−6 and introducing it into a validated spray combustion CFD model for OMEs. The simulations were conducted for single- and multi-injection patterns, changing ambient temperatures, and oxygen contents. The results were validated against high-pressure and high-temperature constant-pressure chamber experiments. OH*-chemiluminescence measurements accomplished the characterization of the auto-ignition process. Both experiments and simulations were conducted for two different injectors. Significant improvements concerning the prediction of the ignition delay time were accomplished while also retaining an excellent agreement for the flame lift-off length. The spatial zones of high-temperature reaction activity were also affected by the adaption of the reaction kinetics. They showed a greater tendency to form OH* radicals within the center of the spray in accordance with the experiments.

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“…POMDME optical investigations. POMDME as a sole replacement for compression ignition is optically investigated in constant volume chambers, 46,50,54,[59][60][61][62][63][64] rapid compression expansion machines, optically accessible engines 42,51,65,66 and as blends. 45,51,67 Macroscopically, the spray of OME 3-5 offered a high lift-off length despite a short ignition delay in a constant volume high-pressure chamber, indicative of a favorable mixing behavior with relatively high air-fuelratio -positively affected by the inherent oxygen content -in the fuel-rich zone near the injector.…”

Section: Pilot-ignited Lean-premixed Natural Gas Enginesmentioning

confidence: 99%

“…POMDME as a sole replacement for compression ignition is optically investigated in constant volume chambers, 46,50,54,59–64 rapid compression expansion machines, optically accessible engines 42,51,65,66 and as blends. 45,51,67…”

Section: Introductionmentioning

confidence: 99%

Optical study on a heavy-duty natural gas dual-fuel engine applying POMDME as pilot fuel

Mühlthaler,

Prager,

Jaensch

2024

International Journal of Engine Research

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In this study, a fully optically accessible single-cylinder research engine is the basis for the visualization and generation of extensive knowledge about the in-cylinder processes of mixture formation, ignition, and combustion of alternative fuels for the dual-fuel combustion process. POMDME substitutes the fossil pilot fuel as a drop-in, non-sooting alternative to widely eliminate the NOx-PM tradeoff. Furthermore, an optimized ignition behavior, increased degrees of freedom in combustion phasing, and the pilot’s energy content are expected. The flame luminosity transmitted via an optical piston was split in the optical path to record the natural flame luminosity simultaneously with an RGB high-speed camera. The second channel consisted of OH chemiluminescence recording, isolated by a bandpass filter via an intensified monochrome high-speed camera. To investigate the combustion process spectrally, spatially, and temporally resolved in more detail, selected operating points were re-recorded via a high-speed imaging spectrograph. POMDME is benchmarked against regular diesel oil, according to EN590. Synthetic natural gas is applied as the primary gaseous fuel. Experimental sweeps along the overall pilot’s energy content (2%, 5%, 10%), injection pressure (500–1600 bar), and start of energizing (5–55 CAD bFTDC) are carried out. The given conditions result in decreased liquid-penetration length between 25% and 30% for the oxygenate, larger for earlier SOE and higher dilution. The lift-off length is nearer the liquid penetration length, increasing for higher rail pressures. The light-based ignition delay for EN590 is enlarged by 0.8 CAD after adding methane, while the oxygenate is not visibly retarded. Without methane, the oxygenate preceded EN590 by 0.6 CAD. The temporal and spatial position and extent of premixed, diffusive, and OH*, change significantly. RCCI operation at practically relevant 18.4 bar IMEP is demonstrated, highlighting the influence of the start of energizing variation with 51% decreased burn duration in the first half of combustion.

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Mixture Formation Analysis of Polyoxymethylenether Injection

Cited by 10 publications

References 0 publications

Mixture formation of OME3−5 and 1-Octanol in comparison with diesel-like Dodecane under ECN Spray A conditions

Mixture formation of OME3−5 and 1-Octanol in comparison with diesel-like Dodecane under ECN Spray A conditions

Numerical study of novel OME1−6 combustion mechanism and spray combustion at changed ambient environments

Optical study on a heavy-duty natural gas dual-fuel engine applying POMDME as pilot fuel

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