Development of Multi-Zone Phenomenological Model for SI Engine

Bhat, Vishwajith; Tamma, Bhaskar

doi:10.4271/2014-01-1068

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…In [37], a multi-zone phenomenological model of flame combustion was used, which allows predicting the characteristics and harmful emissions of SI engines. The model takes into account flame combustion turbulence, flame geometry interaction with the walls, heat transfer from the gas to the walls, CO and NO emissions from combustion zones and hydrocarbon emissions from relatively cold zones.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development of a three-zone combustion model for stratified-charge spark-ignition engine

Korohodskyi

Rogovyi

Voronkov

et al. 2021

EEJET

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A thermodynamic model for calculating the operating process in the cylinder of a spark-ignition engine with internal mixture formation and stratified air-fuel charge based on the volume balance method was developed. The model takes into account the change in the working fluid volume during the piston movement in the cylinder. The equation of volume balance of internal mixture formation processes during direct fuel injection into the engine cylinder was compiled. The equation takes into account the adiabatic change in the volume of the stratified air-fuel charge, consisting of fuel-air mixture volume and air volume. From the heat balance equation, the change in the fuel-air mixture volume during gasoline evaporation in the fuel stream and from the surface of the fuel film due to external heat transfer was determined. Basic equations of combustion-expansion processes of the stratified air-fuel charge were derived, taking into account three zones corresponding to combustion products, fuel-air mixture and air volumes. The equation takes into account the change in the working fluid volume due to heat transfer and heat exchange between the zones and the walls of the above-piston volume. Dependences for determining the temperature in the three considered zones and pressure in the cylinder were obtained. Graphs of changes in the volumes of the combustion products, fuel-air mixture and air zones with the change of the above-piston volume in partial load modes (n=3,000 rpm) were plotted. With increasing load from bmep=0.144 MPa to bmep=0.322 MPa, at the moment of fuel ignition, the volume of the fuel-air mixture increases from 70 % to 92 % of the above-piston volume. At the same time, the air volume decreases from 30 % to 8 %. Analysis of theoretical and experimental indicator diagrams showed that discrepancies in the maximum combustion pressure do not exceed 5 %

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development of a three-zone combustion model for stratified-charge spark-ignition engine

Korohodskyi

Rogovyi

Voronkov

et al. 2021

EEJET

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“…10,11 Nevertheless, the turbulent nature of in-cylinder flows in SI engines needs to be considered to provide realistic RoHR predictions. 5,6,12–20 Different Q-D combustion models are available to account for the effect of the in-cylinder turbulence on the flame speed of SI engines. 10,11 Common methods are the entrained model 6,15,21 and the fractal model.…”

Section: Introductionmentioning

confidence: 99%

A process for an efficient heat release prediction at the concepts screening stage of gasoline engine development

Rota

Morgan

Mustafa

et al. 2020

International Journal of Engine Research

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In recent years, the exploration of new combustion technologies has accelerated in response to increasingly stringent emissions regulations and fuel economy demands. Virtual engineering tools, that enable the screening of novel hardware and engine calibrations at the early stage of engine development, have become imperative to meet new emission regulations. One-dimensional engine simulations are used at the start of the design of a new engine to define the overall combustion system geometries. Later, more complex three-dimensional computational fluid dynamics calculations are coupled to one-dimensional engine system codes to optimise initial concept geometries and define a system design ready for prototyping. To provide meaningful results, one-dimensional engine system codes often use empirical-based combustion models to calculate the engine burn rate. Moreover, realistic engine burn rates responses, for the entire engine map and for different calibrations, are required to provide three-dimensional computational fluid dynamics codes with correct boundary conditions during the design optimisation phase. Thus, the burn characteristic of new non-traditional combustion solution, for which little experimental data are available, needs to be initially assumed. To improve virtual development and reduce this uncertainty, the industry’s attention shifted towards quasi-dimensional combustion models capable of providing engine burn rate predictions. Within the quasi-dimensional modelling framework, turbulence models, adding extra user-input variables, are required to capture the effect of different combustion chamber geometries on the engine combustion rate. Rigorous validation of zero-dimensional turbulence models for different engine concepts and calibrations is therefore needed to enable quasi-dimensional combustion models to predict the engine burn rate. An alternative methodology, with limited dependency on previous test data, is required to enhance the exploration of novel combustion strategies and geometric architectures. An available process, based on a quasi-dimensional combustion stochastic reactor model, a one-dimensional engine system model and non-combusting three-dimensional computational fluid dynamics calculations, was used for this work. The approach uses limited non-combusting computational fluid dynamics calculations and a previously developed scaling factor response for the stochastic reactor model turbulence input ( τSRM) to quickly predict the engine rate of heat release. In this work, the scaling factor response was assessed against two different engine variants over a variety of engine operating conditions. Moreover, the same response was used to predict the effect of different bore-to-stroke ratios on the engine combustion rate and knock tolerance. Non-combusting computational fluid dynamics and one-dimensional engine system simulations have been carried out to investigate changes in turbulence characteristics due to different engine variants and bore-to-stroke ratios. It was shown that limited number of non-combusting computational fluid dynamics runs is required to characterise the in-cylinder turbulence for each explored engine variant. The scaling factor response was used to manipulate the turbulence input ( τSRM) resulting in good engine burn rates predictions for the explored engine variants and bore-to-stroke ratios. The presented methodology showed augmented predictive capabilities and has potential to move the engine development towards a less hardware dependent virtual approach, offering a practical solution for the exploration of new engine concepts.

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Development of a phenomenological model for the description of RCCI combustion in a dual-fuel marine internal combustion engine

et al. 2022

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Development of Multi-Zone Phenomenological Model for SI Engine

Cited by 6 publications

References 12 publications

Development of a three-zone combustion model for stratified-charge spark-ignition engine

Development of a three-zone combustion model for stratified-charge spark-ignition engine

A process for an efficient heat release prediction at the concepts screening stage of gasoline engine development

Development of a phenomenological model for the description of RCCI combustion in a dual-fuel marine internal combustion engine

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