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Effects of wall wetting and in-cylinder fuel distribution in an advanced turbo-charged engine

Journal of Central South University 2022年第7期29卷 2165-2178页

作者： rOSTAMPOUr A SHOJAEEFArD M H molaeimanesh g r SAFAEI-ArSHI A School of Automotive Engineering Iran University of Science and TechnologyNarmakTehran ***Iran School of Mechanical Engineering Iran University of Science and TechnologyNarmakTehran ***Iran

One of the proposed concepts for spark ignition engines is advanced port fuel injection(APFI),which suggests using two port injectors for each *** this research,we numerically examine the capabilities of this concept in reducing fuel consumption and increasing engine *** results demonstrated that the use of this concept is very effective due to the use of two injectors and the possibility of reducing the spraying time and bringing the injection start time closer to the air inlet valve opening *** maximum amount of fuel film formed on the walls is reduced by about 75%,naturally,which leads to better and more homogeneous fuel distribution inside the combustion chamber and increases combustion *** results showed that under the same boundary conditions and engine operating point,the use of two port injectors for each cylinder leads to an increase of more than 20%of the maximum combustion chamber pressure and about 4%combustion *** the other hand,fuel film formation becomes worse in cold *** in this study,the capabilities of this concept in cold conditions were investigated *** have shown that the advanced port fuel injection,unlike conventional engines,is almost insensitive to inlet temperature changes.

关键词： advanced port fuel injection(APFI) fuel film fuel distribution wall wetting heat transfer phenomena

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Impact of carbon paper structural parameters on the performance of a polymer electrolyte fuel cell cathode via lattice Boltzmann method

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Acta Mechanica Sinica 2020年第2期36卷 367-380页

作者： M.Nazemian g.r.molaeimanesh research Laboratory of Automotive Fluids and Structures Analysis Automotive Engineering SchoolIran University of Science and TechnologyTehran 16846-13114Iran

Polymer electrolyte fuel cells(PEFCs)being employed in fuel cell electric vehicles(FCEVs)are promising power generators producing electric power from fuel stream via porous *** of carbon paper gas diffusion layers(gDLs)applying in the porous electrodes can greatly affect the PEFC performance,especially at the cathode side where electrochemical reaction is more *** discover the role of carbon paper gDL structure on the mass transfer properties,different cathode electrodes with dissimilar structural parameters are simulated via lattice Boltzmann method(LBM).3D contours of oxygen and water vapor concentration through the gDL as well as the 2D contours of current density on the catalyst layer are illustrated and *** results indicate that the carbon fiber diameter has a negligible impact on the current density while the impact of carbon paper thickness and porosity is *** fact,increasing of carbon paper thickness or porosity leads to lack of cell performance.

关键词： Polymer electrolyte fuel cell(PEFC) Lattice Boltzmann method(LBM) Microstructure reconstruction Carbon paper Mass transfer properties

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Effects of turbulator shape,inclined magnetic field,and mixed convection nanofluid flow on thermal performance of micro-scale inclined forward-facing step

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Journal of Central South University 2021年第11期28卷 3310-3326页

作者： E.JALIL g.r.molaeimanesh research Laboratory of Automotive Fluids and Structures Analysis School of Automotive EngineeringIran University of Science and TechnologyTehran 16846-13114Iran

This investigation numerically examined the combined impacts of different turbulator shapes,Al_(2)O_(3)/water nanofluid,and inclined magnetic field on the thermal behavior of micro-scale inclined forward-facing step(MSIFFS).The length and height for all turbulators were considered 0.0979 and 0.5 mm,respectively,and the reynolds number varied from 5000 to *** order to compare the skin friction coefficient(SFC) and the heat transfer rate(HTr)simultaneously,the thermal performance factor parameter(TPF) was *** results show that all considered cases equipped with turbulators were thermodynamically more advantageous over the simple ***,using Al_(2)O_(3)/water nanofluid with different nanoparticles volume fractions(NVF) in the presence of inclined magnetic field(IMF)increased *** an increment of NVF from 1% to 4% and magnetic field density(MFD) from 0.002 to 0.008 T,HTr and subsequently TPF *** best result was observed for MSIFFS equipped with a trapezoidal-shaped turbulator with 4% Al_(2)O_(3) in the presence of IMF(B=0.008 T).The TPF increased with the augmentation of re,and the maximum value of it was 5.2366 for MSIFFS equipped with a trapezoidal-shaped turbulator with 4% Al_(2)O_(3),B=0.008 T,and re=10000.

关键词： microchannel forward-facing step turbulator inclined magnetic field heat transfer enhancement

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