Critical evaluation of current heat transfer models used in CFD in-cylinder engine simulations and establishment of a comprehensive wall-function formulation

Rakopoulos, C.D.; Kosmadakis, George; Pariotis, Efthimios G.

doi:10.1016/j.apenergy.2009.09.029

Cited by 138 publications

(87 citation statements)

References 32 publications

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“…Furthermore, for the turbulence model the source terms of the turbulent kinetic energy and its dissipation are the same as in Ref. [21].…”

Section: Cfd Modelmentioning

confidence: 99%

“…Further details of the in-house CFD model used, concerning the pressure-correction algorithm used (PISO) [18], the turbulence model, the mesh generation model, the crevice model, as well as a detailed evaluation and validation of the developed CFD model under both motoring and firing conditions, can be found in previous published papers by the first two authors [16,[20][21][22].…”

Section: Cfd Modelmentioning

confidence: 99%

“…In the present study the wall-heat flux correlation developed in a previous work of the first two authors [21] is used for the simulation of the heat transfer mechanism. Its formulation is based on a compressible version of the standard law-of-the-wall [23], and it includes the unsteady pressure term, which has been also shown in [24] to give more accurate results.…”

Section: Heat Transfer Modelmentioning

confidence: 99%

“…Further details concerning the development, implementation and validation of this heat transfer model used in the in-house CFD code, can be found in previous works of the first two authors [21,25].…”

Section: Heat Transfer Modelmentioning

confidence: 99%

“…Concerning the computational mesh used, previous relevant studies [20,21], together with a parametric study using the firing version of the developed CFD code, have shown that the most reliable mesh, providing adequate accuracy and keeping the required CPU time relative low, is the one having (40x40x40) grid lines along each axis respectively.…”

Section: Computational Detailsmentioning

confidence: 99%

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A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

Rakopoulos

Kosmadakis

Demuynck

et al. 2011

International Journal of Hydrogen Energy

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A COMBINED EXPERIMENTAL AND NUMERICAL STUDY OF THERMAL PROCESSES, PERFORMANCE AND NITRIC OXIDE EMISSIONS IN A HYDROGEN-FUELED SPARK-IGNITION ENGINE ABSTRACTThis work concerns the study of a spark-ignition engine fueled with hydrogen, using both measured and numerical data at various conditions, focusing on the combustion efficiency, the heat transfer phenomena and heat loss to the cylinder walls, the performance, as well as the nitric oxide (NO) emissions formed, when the fuel/air and compression ratio are varied. For the investigation of the heat transfer mechanism, the local wall temperatures and heat flux rates were measured at three locations of the cylinder liner in a CFR engine. These fluxes can provide a reliable estimation of the total heat loss through the cylinder walls and of the hydrogen flame arrival at specific locations. Together with the experimental analysis, the numerical results obtained from a validated in-house CFD code were utilized for gaining a more complete view of the heat transfer mechanism and the hydrogen combustion efficiency for the various cases examined. The performance of the CFR engine is then identified, since the calculated cylinder pressures are compared with the measured ones, from which performance and heat release rates are calculated and discussed. Further, NO emission studies have been accomplished, with the calculated results not only being compared with the measured exhaust NO ones, but also further processed for conducting an in-depth investigation of the dependence of NO production on the spatial distribution of in-cylinder gas temperature. It is revealed that for lower fuel/air ratio the burned gas temperature is held at low level and the heat loss ratio is quite low. As the load increases and stoichiometric mixtures are used, the wall and in-cylinder gas temperatures increase substantially, together with the heat loss and the NO emissions, owing to the high hydrogen combustion velocity and the consequent high rate of temperature rise. The combustion efficiency is slightly increased, but the indicated efficiency is decreased due to higher heat loss.Keywords: hydrogen; spark-ignition engine; combustion efficiency; heat transfer; NO emissions.

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“…Furthermore, for the turbulence model the source terms of the turbulent kinetic energy and its dissipation are the same as in Ref. [21].…”

Section: Cfd Modelmentioning

confidence: 99%

Section: Cfd Modelmentioning

confidence: 99%

Section: Heat Transfer Modelmentioning

confidence: 99%

Section: Heat Transfer Modelmentioning

confidence: 99%

Section: Computational Detailsmentioning

confidence: 99%

See 3 more Smart Citations

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

Rakopoulos

Kosmadakis

Demuynck

et al. 2011

International Journal of Hydrogen Energy

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Spark-Ignition Engine Fueled with Methane-Hydrogen Blends

Kosmadakis

Moreno

Arroyo

et al. 2016

Energy, Transportation and Global Warming

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Reference evapotranspiration estimation without local climatic data

2010

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The main goal of this work is to validate an innovative experimental facility and to establish a methodology to evaluate the influence of some of the engine parameters on local engine heat transfer behaviour under motored steady-state conditions. Instantaneous temperature measurements have been performed in order to estimate heat fluxes on a modified Diesel single cylinder combustion chamber. This study was divided into two main parts. The in order to understand local behaviour of heat transfer in an internal combustion engine, and the influence of engine parameters on local instantaneous temperature and heat flux, have been analysed.

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Critical evaluation of current heat transfer models used in CFD in-cylinder engine simulations and establishment of a comprehensive wall-function formulation

Cited by 138 publications

References 32 publications

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

Spark-Ignition Engine Fueled with Methane-Hydrogen Blends

Reference evapotranspiration estimation without local climatic data

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