Accurate prediction of the rate of heat release in a modern direct injection diesel engine

Lakshminarayanan, P. A.; Aghav, Yogesh V.; Dani, A. D.; Mehta, Pramod S.

doi:10.1177/095440700221600805

Cited by 37 publications

(16 citation statements)

References 2 publications

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“…To model the effects of wall interaction, a parameter C wall was used to model the effect of the momentum lost due to collision with the wall. 49 This factor is based on the estimation of flow penetration into the cylinder by considering the turbulent energy dissipation (see equations (25) to (27) below). The turbulent energy density was calculated using…”

Section: Cylinder Modelmentioning

confidence: 99%

Characterisation and optimisation of a real-time diesel engine model

Dowell

Akehurst

Burke

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Accurate real time engine models are an essential step to allow the development of control algorithms in parallel to the development of engine hardware using hardware in the loop application. A physics-based model of the engine high-pressure air path and combustion chamber is presented. The model has been parameterised using data from a small set or carefully selected operating conditions for a 2.0L Diesel engine. The model has subsequently been validated over the complete engine operating map with and without EGR. A high level of fit was achieved with R 2 value above 0.94 for mean effective pressure and above 0.99 for air flow rate. Model run-time was then reduced for real-time application by using forward differencing; single precision floating point numbers; and by only calculating in-cylinder prediction for a single cylinder. A further 25% improvement in run time was achieved by improving sub-models, including the strategic use of 1D/2D look-up tables with optimised resolution. The model exceeds the performance of similar models in the literature achieving 0.5°CA resolution at 4000rev/min. This simulation step size 2 still yields good accuracy compared to 0.1°CA resolution and has been validated against experimental results from an NEDC drive cycle. The real-time model will allow the development of control strategies before the engine hardware is available, meaning more time can be spent ensuring the engine can meet performance and emissions requirements over it full operating range.

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Section: Cylinder Modelmentioning

confidence: 99%

Characterisation and optimisation of a real-time diesel engine model

Dowell

Akehurst

Burke

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Unlike other models where no experimental data are required, such as that presented by Lakshminarayanan et al (2002), some preliminary tests on engines had to be performed for this model in order to evaluate the actual engine dynamic compression ratio and heat transfer.…”

Section: Combustion Diagnosismentioning

confidence: 99%

The effects of injector hole convergence on diesel combustion and emissions

Payri¹,

Benajes²,

Gonzalez³

et al. 2004

IJVD

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The influence of different nozzle hole geometries in diesel spray behaviour and emissions was studied. Two multiple-hole nozzles, with different convergence ratios, were tested in an injection test rig and in a single cylinder engine. The nozzle hole diameter was changed but the injection pressure and mass flux were kept fairly constant. The tests in cold conditions were carried out with two different ambient pressures in order to obtain data from penetration and spray angle. Emission results are exhibited in terms of brake specific fuel consumption, dry soot and nitrogen oxides. Additional data from the cylinder conditions such as the burnt products' temperature and the heat release rate were obtained. Convergent nozzles presented a higher penetration rate, but a narrower spray angle. In terms of combustion, findings showed little difference in fuel consumption for both nozzles; nevertheless, for the tested conditions divergent nozzles exhibited worse mixing rates than the convergent ones.

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“…As an effective approach, phenomenological combustion models are often developed to calculate the combustion process, which is mainly represented by the heat release rate in diesel engines based on important physical and chemical phenomena within the limited calculation time requirements for studying parameters, such as the models described by Hiroyasu et al, 6 Barba et al, 7 Lakshminarayana et al 8 and Chmela and Orthaber. 9 The stochastic combustion model [10][11][12][13] is one such model for conventional and premixed charge compression ignition (PCCI) diesel combustion, in which a stochastic turbulent mixing model is combined with a global chemical kinetic model.…”

Section: Introductionmentioning

confidence: 99%

Combustion modelling for a diesel engine with multi-stage injection using a stochastic combustion model

Liu

Horibe

Ishiyama

2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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This study presents the development of a phenomenological combustion model to simulate the combustion processes in diesel engines with multi-stage fuel injection. A newly developed zero-dimensional spray propagation model and a model of spray-to-spray interaction were combined with a stochastic combustion model, which had been developed for diesel combustion calculation in the cases of single-stage injection. In this model, the combustion chamber is divided into an ambient air zone and several spray zones, where the spray formed by each injection is treated as a spray zone. Turbulent mixing, fuel evaporation, heat loss, and chemical reactions, are calculated in each spray zone respectively. A zero-dimensional spray propagation model including the spray evolution after the end of injection (EOI) and the model of interaction between the sprays from sequent injections are developed to describe the spray behavior for the case of multistage injection. Then the developed combustion model is validated against the experimental data from a single-cylinder DI diesel engine with pilot/main two-stage injection, in which the pilot injection conditions are varied with fixed main injection timing. Based on the analysis of heat release rate, entrainment rate, and the microscopic information inside the spray, such as probability density function (PDF) of equivalence ratio, the effects of wall impingement and interaction between adjacent sprays on fuel-air mixing rate and entrainment rate are formulized and employed to reproduce the measured histories of heat release rate. Reduction of fuel-air mixing rate is considered when the spray flows into the squish region after the wall impingement, which is effective to capture the measured decrease of pilot spray's heat release with advancing pilot injection timing. The effects of wall impingement of the main spray and the interaction between adjacent sprays are modeled to reproduce the heat release rate during the initial and later part of the mixing-controlled combustion. After these improvements, heat release rates of the test engine when varying the pilot injection conditions have been successfully predicted.

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Accurate prediction of the rate of heat release in a modern direct injection diesel engine

Cited by 37 publications

References 2 publications

Characterisation and optimisation of a real-time diesel engine model

Characterisation and optimisation of a real-time diesel engine model

The effects of injector hole convergence on diesel combustion and emissions

Combustion modelling for a diesel engine with multi-stage injection using a stochastic combustion model

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