Konzepte für die Dieselähnliche Wasserstoffverbrennung

Eichlseder, Helmut; Spuller, Christian; Heindl, Rene; Gerbig, Falk; Heller, Klaus

doi:10.1007/bf03225543

Cited by 18 publications

(3 citation statements)

References 3 publications

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“…This model has been developed recently as a reference model for the novel correction function approach to overcome the various simplifications of the standard evaporation models by various correction functions. K-zeta-f was used as a model of turbulence [20][21][22]. To describe a break-up process, the WAVE model with child breakup was chosen [23].…”

Section: Methodsmentioning

confidence: 99%

Detailed Injection Strategy Analysis of a Heavy-Duty Diesel Engine Running on Rape Methyl Ester

et al. 2021

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Using biodiesel fuel in diesel engines for heavy-duty transport is important to meet the stringent emission regulations. Biodiesel is an oxygenated fuel and its physical and chemical properties are close to diesel fuel, yet there is still a need to analyze and tune the fuel injection parameters to optimize the combustion process and emissions. A four-injections strategy was used: two pilots, one main and one post injection. A highly advanced SOI decreases the NOx and the compression work but makes the combustion process less efficient. The pilot injection fuel mass influences the combustion only at injection close to the top dead center during the compression stroke. The post injection has no influence on the compression work, only on the emissions and the indicated work. An optimal injection strategy was found to be: pilot SOI 19.2 CAD BTDC, pilot injection fuel mass 25.4%; main SOI 3.7 CAD BTDC, main injection fuel mass 67.3% mg; post SOI 2 CAD ATDC, post injection fuel mass 7.3% (the injection fuel mass is given as a percentage of the total fuel mass injected). This allows the indicated work near the base case level to be maintained, the pressure rise rate to decrease by 20% and NOx emissions to decrease by 10%, but leads to a 5% increase in PM emissions.

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Section: Methodsmentioning

confidence: 99%

Detailed Injection Strategy Analysis of a Heavy-Duty Diesel Engine Running on Rape Methyl Ester

et al. 2021

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“…Exhaust gas recirculation was shown to greatly reduce the nitrogen oxide emissions of dual fuel hydrogen engines, which are a big problem for any engine operating at high temperatures [32]. While it was shown that it is possible to run hydrogen in a diesel combustion process by itself using either air preheated to 200 • C or glow plugs resulting in thermal efficiencies varying between 32 and 49% depending on the engine load, this approach could not be found in recent publications [33]. Consequently, the diesel cycle, where the fuel is required to ignite by itself when compressed, is not a suitable option for an engine intended to run solely on hydrogen.…”

Section: Hydrogen Combustion Enginementioning

confidence: 99%

Comparison of Hydrogen Powertrains with the Battery Powered Electric Vehicle and Investigation of Small-Scale Local Hydrogen Production Using Renewable Energy

Handwerker

Wellnitz

Marzbani³

2021

Hydrogen

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Climate change is one of the major problems that people face in this century, with fossil fuel combustion engines being huge contributors. Currently, the battery powered electric vehicle is considered the predecessor, while hydrogen vehicles only have an insignificant market share. To evaluate if this is justified, different hydrogen power train technologies are analyzed and compared to the battery powered electric vehicle. Even though most research focuses on the hydrogen fuel cells, it is shown that, despite the lower efficiency, the often-neglected hydrogen combustion engine could be the right solution for transitioning away from fossil fuels. This is mainly due to the lower costs and possibility of the use of existing manufacturing infrastructure. To achieve a similar level of refueling comfort as with the battery powered electric vehicle, the economic and technological aspects of the local small-scale hydrogen production are being investigated. Due to the low efficiency and high prices for the required components, this domestically produced hydrogen cannot compete with hydrogen produced from fossil fuels on a larger scale.

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“…This is because of the difficulties with ignition, as experimentally shown by Ikegami et al 13 and Furuhama and Fukuma 14 , which is explained by the research octane number (RON) of over 130 for H 2 fuel. 15 These issues have been partly solved by using spark plugs, 14,16,17 glow plugs, 17 lean premixed charge ignited by spark plugs before the main nonpremixed combustion, 16 and raised top dead center (TDC) temperatures. 18 The former three solutions require additional complications to the combustion system, while the last approach would have an impact on the engine efficiency, operating range, and, potentially, emissions.…”

Section: Introductionmentioning

confidence: 99%

Computational optimization of a hydrogen direct-injection compression-ignition engine for jet mixing dominated nonpremixed combustion

Babayev

Andersson

Dalmau

et al. 2021

International Journal of Engine Research

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Hydrogen (H2) nonpremixed combustion has been showcased as a potentially viable and preferable strategy for direct-injection compression-ignition (DICI) engines for its ability to deliver high heat release rates and low heat transfer losses, in addition to potentially zero CO2 emissions. However, this concept requires a different optimization strategy compared to conventional diesel engines, prioritizing a combustion mode dominated by free turbulent jet mixing. In the present work, this optimization strategy is realized and studied computationally using the CONVERGE CFD solver. It involves adopting wide piston bowl designs with shapes adapted to the H2 jets, altered injector umbrella angle, and an increased number of nozzle orifices with either smaller orifice diameter or reduced injection pressure to maintain constant injector flow rate capacity. This work shows that these modifications are effective at maximizing free-jet mixing, thus enabling more favorable heat release profiles, reducing wall heat transfer by 35%, and improving indicated efficiency by 2.2 percentage points. However, they also caused elevated incomplete combustion losses at low excess air ratios, which may be eliminated by implementing a moderate swirl, small post-injections, and further optimized jet momentum and piston design. Noise emissions with the optimized DICI H2 combustion are shown to be comparable to those from conventional diesel engines. Finally, it is demonstrated that modern engine concepts, such as the double compression-expansion engine, may achieve around 56% brake thermal efficiency with the DICI H2 combustion, which is 1.1 percentage point higher than with diesel fuel. Thus, this work contributes to the knowledge base required for future improvements in H2 engine efficiency.

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Konzepte für die Dieselähnliche Wasserstoffverbrennung

Cited by 18 publications

References 3 publications

Detailed Injection Strategy Analysis of a Heavy-Duty Diesel Engine Running on Rape Methyl Ester

Detailed Injection Strategy Analysis of a Heavy-Duty Diesel Engine Running on Rape Methyl Ester

Comparison of Hydrogen Powertrains with the Battery Powered Electric Vehicle and Investigation of Small-Scale Local Hydrogen Production Using Renewable Energy

Computational optimization of a hydrogen direct-injection compression-ignition engine for jet mixing dominated nonpremixed combustion

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