Numerical Investigation of Injection Timing Influence on Fuel Slip and Influence of Compression Ratio on Knock Occurrence in Conventional Dual Fuel Engine

Sremec, Mario; Taritaš, Ivan; Sjerić, Momir; Kozarac, Darko

doi:10.13044/j.sdewes.d5.0163

Cited by 12 publications

(3 citation statements)

References 12 publications

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“…The B7 in the name of fuel indicates around 7% biodiesel content, which indicates the utilization of biofuels in conventional diesel engines 52 . The injection rate timing has a direct influence on engine performance, 53 for that reason, the inlet fuel velocity is calculated from the measured injection rate, which is shown in Figure 2. Figure 2 shows the injection curve rate is shown as a nondimensional parameter, where the area under the curve presents the total injected fuel mass in one operating cycle.…”

Section: Experimental Data and Numerical Setupmentioning

confidence: 99%

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

Jurić

Coelho

Priesching

et al. 2022

Intl J of Energy Research

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Summary It is well‐known that the pollutant formation processes and temperature distribution in various combustion systems that operate at high temperatures are influenced by radiation heat transport. Detailed modeling of radiation transport in internal combustion (IC) engines demands additional computational power, and hence the calculation of radiation phenomenon is not commonly applied in IC engines. At the same time, current operating conditions in IC engines consider high temperatures and recirculation of exhaust gases that enhance gas radiation. Therefore, the application of radiation models is needed to increase the correctness of radiative absorption, combustion characteristics, and the formation of pollutant emissions. In this paper, the implementation and validation of the spectral line‐based weighted‐sum‐of‐gray‐gases (SLW) model for calculating soot and gas radiation are performed. The SLW model is implemented in the computational fluid dynamics code AVL FIRE by programable user routines. The radiative transfer equation was calculated employing the finite volume method applicable for multiprocessing, moving meshes, and a mesh rezone procedure required for IC engine modeling. The validation of the SLW model is performed on one‐dimensional geometric cases that include analytical results of radiation intensity, for which agreement within 10% of the relative error was achieved. Additionally, the SLW model is applied to compression ignition engine simulations, where the obtained results are compared with the measured pressure and concentrations of NO and soot emissions. The calculated heat losses through the wall boundary layer were around 12% of the total fuel energy, approximately 9.5% of the total fuel energy was lost due to the convective flow. 7%–8% of convection heat loss was due to the higher emission than absorption of participating CO2 and H2O gasses, and the rest are net soot losses. For the observed operating cases, the computational time is increased nearly double for SLW model than in the simulation without radiation. Finally, the results calculated using SLW indicate an improved agreement with the experimental mean pressure, temperature, soot, and NO concentrations compared to simulations without radiation.

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Section: Experimental Data and Numerical Setupmentioning

confidence: 99%

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

Jurić

Coelho

Priesching

et al. 2022

Intl J of Energy Research

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“…Furthermore, dual fuel engines are subject to fuel slip into the exhaust port during the valve overlap period which results in an increase in HC emissions, largely composed of methane. This phenomenon occurs at all ranges of engine loads and speeds, especially in charged engines because of a positive pressure difference between intake and exhaust pipes [14].…”

Section: Conventional Dual Fuel Enginementioning

confidence: 99%

The Effect of Operating Parameters on Dual Fuel Engine Performance and Emissions – An Overview

et al. 2017

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SummaryIn order to decrease harmful exhaust gas emissions from internal combustion engines, researchers are continuously looking for alternative fuels and combustion techniques, and in this context the use of natural gas as a supplement for conventional fuels has been suggested. Since natural gas has high autoignition temperature, it cannot be used in compression ignition engines as the in-cylinder temperature around the top dead center is simply not high enough to ignite it. Therefore, in such an application natural gas has to be used with high reactivity fuel, usually diesel fuel. In these applications diesel fuel is used solely as a high energy ignition device, while natural gas is used as primary fuel. This type of combustion process is called dual fuel combustion process. This paper presents the effect of operating parameters, such as diesel fuel injection pressure, injection timing, diesel fuel mass, diesel fuel substitution ratio and intake charge conditioning, as well as engine load and speed on efficiency and harmful exhaust gas emissions from dual fuel diesel/natural gas internal combustion engines.

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“…A detailed investigation of the multi-injection strategy was conducted in [12], where CFD analysis showed the capabilities to model the low-temperature combustion in order to achieve higher efficiency, lower nitric oxides, and lower soot emissions. In [13], the authors showed the possibilities to achieve the higher thermal efficiency of a dual fuel engine by optimising the fuel injection strategy. It is known that the fuel consumption efficiency and pollutant emissions depend on the injection system parameters, piston geometry parameters, and conditions inside the combustion chamber [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of injection timing and rail pressure impact on combustion characteristics of a diesel engine

Jurić

Petranović

Vujanović

et al. 2019

Energy Conversion and Management

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To explore the influence of fuel injection strategy on the combustion process, the Computational Fluid Dynamics (CFD) simulations were performed, and simulation results were validated against the experimental data measured at different rail pressures and injection timings. The experiments were conducted on a diesel engine equipped with an advanced injection system that allows full control over the injection parameters. To model the combustion process of EN590 diesel fuel, two different approaches were used: the General Gas Phase Reactions (GGPR) approach and the 3-zones Extended Coherent Flame Model (ECFM-3Z+). The calculated results, such as mean pressure and rate of heat release, were validated against experimental data in operating points with different injection parameters in order to prove the validity of spray and combustion sub-models. At the higher injected pressure, GGPR model showed better prediction capability in the premixed phase of combustion process, compared to the ECFM-3Z+ model. Nevertheless, in the rate-controlled phase of combustion process, ECFM-3Z+ model shows stronger diffusion of temperature field, due to the more detailed consideration of combustion diffusion phenomena in the ECFM-3Z+ governing equations. Furthermore, the results show that the rail pressure has a lower impact on the combustion process for injection timing after the Top Dead Centre (TDC). Both, single and multi-injection cases are found to be in a good agreement with the experimental data, while the GGPR approach was found to be suitable only for combustion delay determination and ECFM-3Z+ also for the entire combustion process.

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Numerical Investigation of Injection Timing Influence on Fuel Slip and Influence of Compression Ratio on Knock Occurrence in Conventional Dual Fuel Engine

Cited by 12 publications

References 12 publications

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

The Effect of Operating Parameters on Dual Fuel Engine Performance and Emissions – An Overview

Experimental and numerical investigation of injection timing and rail pressure impact on combustion characteristics of a diesel engine

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