Numerical studies on the mixing characteristics of exhaust gas recirculation gases with air, and their dependence on system geometries in four-cylinder engine applications

Kim, J N; Kim, H Y; Yoon, Sujung; Sohn, Jeong-Soo; Kim, C R

doi:10.1243/09544070jauto1040

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…They showed that the hydrogen enrichment has a good impact on the incylinder flow characteristics and engine performance. Kim et al (2009) studied numerically the performance of two-different Exhaust Gas Recirculation (EGR) systems in order to reduce the pollutants emissions and improve the combustion behavior. They performed a three-dimensional combustion calculation using the commercial code STAR-CD and the standard k-ε turbulence model.…”

Section: Introductionmentioning

confidence: 99%

In-Cylinder Aero-Thermal Simulation of Compression Ignition Engine: Using a Layering Meshing Approach

Moussa

Ketata

Zied

et al. 2019

JAFM

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Three-dimensional flow simulations of the full cycle for four-valve direct-injection Diesel engine have been carried out with different meshes. The aim of the present study is to establish an extensive CFD investigation of in-cylinder aero-thermal flow of a direct-injection Diesel engine. The ICE-CFD solver is used to examine the unsteady behavior of a realistic engine configuration. Moreover, a layering approach and dynamic mesh model are adopted to generate the grid. The predicted radial velocity and swirl ratio for four different meshes are compared with Laser Doppler Velocimetry measurements and with numerical results from the literature. The comparison shows that the obtained results with the fine mesh present a good agreement with the experimental measurements along the compression phase and at the start of the expansion phase. In addition, these results are more accurate than the predicted results reported in the literature. Furthermore, CFD analysis is presented for the whole cylinder volume with regard to several parameters such as velocity field, swirling, tumble flow, pressure and temperature distributions. These results prove that in-cylinder CFD simulation gives reasonably accurate results that enable enhanced knowledge of the aero-thermal flow of full engine cycle.

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Section: Introductionmentioning

confidence: 99%

In-Cylinder Aero-Thermal Simulation of Compression Ignition Engine: Using a Layering Meshing Approach

Moussa

Ketata

Zied

et al. 2019

JAFM

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An Experimental Investigation on the Role of Hydrogen in the Emission Reduction and Performance Trade-Off Studies in an Existing Diesel Engine Operating in Dual Fuel Mode Under Exhaust Gas Recirculation

Bose¹,

Banerjee

2012

Journal of Energy Resources Technology

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With emission legislations getting more stringent in order to comply with the responsibilities of environmental obligations, engine manufacturers are turning to explore new avenues to meet the paradox of curtailing particulate matter (PM) and NOx emissions on one hand and maintaining consumer expectations of reduced fuel consumption and increased thermal efficiency on the other. Studies dedicated in mitigating such paradoxical objectives have established novel emission reduction systems such as the diesel particulate filter (DPF) and selective catalytic reduction (SCR) after treatment systems but at the expense of increased complexity of deployment and cost. The present work explores the emission and performance characteristics of an existing four stroke single cylinder engine operating with a predefined flow rate of hydrogen as a dual fuel. The hydrogen was premixed with the incoming air and inducted during the duration of intake valve opening by means of an indigenously developed cam actuated electromechanical timed manifold injection technique. exhaust gas recirculation (EGR) (hot and cooled) technique has been implemented in the present work to reduce NOx emissions which were enriched with the same amount of hydrogen. Research studies carried out on the efficacy of EGR techniques have reported the inherent penalty of increasing the common diesel pollutants of smoke and particulate matter and fuel consumption at the expense of reducing NOx emissions. Trade-off studies in the present work revealed contrary results, where 20% cooled EGR under hydrogen enrichment registered a decrease of 9.2% and 12.3% in NOx emissions at 60% and 80% load as compared to diesel operation while simultaneously retaining a reduction of 4.6% and 1.9% in brake specific energy consumption (BSEC) along with 10% and 8.33% corresponding decrease in smoke emissions and a reduction of 11.30% and 12.31% in total unburnt hydrocarbon (TUHC) emissions. CO emissions were simultaneously decreased by 26.6% and 20.0% while CO2 emissions decreased by 24.5% and 29.1%, respectively, while maintaining 4.8% and 2% increase in brake thermal efficiency and a reduction of 23.3% and 18.95% in specific fuel consumption (SFC) (diesel) simultaneously at the respective loads. Similar trade-off potential, as was evident in the 10% EGR strategies, provide a strong motivation to explore the role of hydrogen as in situ dual fuel solution to counter the conflicting emission and performance requirements of contemporary diesel engines made to operate under EGR.

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Numerical studies on the mixing characteristics of exhaust gas recirculation gases with air, and their dependence on system geometries in four-cylinder engine applications

Cited by 2 publications

References 15 publications

In-Cylinder Aero-Thermal Simulation of Compression Ignition Engine: Using a Layering Meshing Approach

In-Cylinder Aero-Thermal Simulation of Compression Ignition Engine: Using a Layering Meshing Approach

An Experimental Investigation on the Role of Hydrogen in the Emission Reduction and Performance Trade-Off Studies in an Existing Diesel Engine Operating in Dual Fuel Mode Under Exhaust Gas Recirculation

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