Performance and Emissions Trade-Offs for a HSDI Diesel Engine - An Optimization Study

Bazari, Z.; French, Bill

doi:10.4271/930592

Cited by 11 publications

(2 citation statements)

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“…An early study found that there is significant increase in soot when using EGR and retarded timing to reduce NOx (Yu and Shahed 1981). A study done on the optimization of diesel engine found out that EGR results in higher soot and BSFC (Bazari and French 1993). In some later studies, it was found that it is possible to reduce NOx and soot simultaneously with retarded injection and EGR (Kimura et al 2002).…”

Section: Exhaust Gas Recirculation (Egr)mentioning

confidence: 99%

Modeling and Simulation of Diesel Engines Using CFD and Its Applications in Optimizing Various In-Cylinder Techniques

Menon

Mittal

2021

Energy, Environment, and Sustainability

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A four-stroke IC engine cycle undergoes the following processesintake, compression, combustion, expansion and exhaust, which are governed by complex fluid dynamics, chemical kinetics and heat transfer phenomena and occur in milli/nanosecond timescales inside the engine cylinder making it difficult to visualize experimentally. A better understanding of the in-cylinder phenomena helps design better engines in terms of performance, fuel consumption and emissions. Optimization of the engine processes through physical testing can be time and cost intensive. CFD analysis helps visualize the various in-cylinder processes, analyze them better and evaluate various engine optimization parameters without having to test on an actual engine, hence it is comparatively effortless to do back-to-back comparisons to identify the effect of a single parameter, which reduces the engine development time and cost drastically. CFD analysis of Diesel engines is particularly useful since there are many in-cylinder optimization parameters in a diesel engine in comparison with a conventional gasoline engine, due to the direct injection and heterogeneous nature of combustion. This chapter aims to give an overview of the general methodology followed in performing CFD simulations in diesel engines towards the objective of enhancing the performance and minimizing the fuel consumption and emissions. Here a comprehensive coverage of the complete process of modeling and simulation is attempted, starting with the basic input data required, typical assumptions used, fundamental governing equations and discretization, model formulation, initial conditions, boundary conditions, model validation, various sub-models used and the analysis of results. The effect of in-cylinder techniques like combustion chamber geometry, injection timing, multiple injections and exhaust gas recirculation on performance and emissions is discussed through a brief review of published literature. It is hoped that the reader will get an insight into the procedure followed in diesel engine CFD analysis and some of its applications in the optimization through various in-cylinder techniques.

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Section: Exhaust Gas Recirculation (Egr)mentioning

confidence: 99%

Modeling and Simulation of Diesel Engines Using CFD and Its Applications in Optimizing Various In-Cylinder Techniques

Menon

Mittal

2021

Energy, Environment, and Sustainability

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“…However, it has been concluded that whilst the recent emphasis has been on increasing volumetric efficiency through control of intake valve closing timing, the effects of this and other valve timings on emissions are not well understood. Investigations are further hampered because prediction of emissions through simulation is difficult [17]. The lack of work in this area can probably be attributed to two factors: firstly to meet the requirements, the VVA systems are of necessity more complex than current production systems and secondly significant changes have occurred in light duty diesel engine configuration in recent years: turbochargers have become almost universal, the use of intercoolers and EGR has become widespread, EGR coolers are becoming commonplace, and most recently common rail and other fuel injection systems offering very high injection pressure and multiple shot or shaped injection characteristics are becoming the norm.…”

Section: Introductionmentioning

confidence: 99%

The Application of Variable Event Valve Timing to a Modern Diesel Engine

Lancefield¹,

Methley²,

Räse³

et al. 2000

SAE Technical Paper Series

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DaimlerChrysler and Mechadyne have undertaken a piece of work to investigate the opportunities for improving the operation of light duty diesel engines using variable valve timing. The very high compression ratios used in this type of engine make it essential to be able to alter the valve open periods to affect exhaust valve opening and intake valve closing, whilst leaving the valve motions largely unchanged around overlap top dead centre to avoid valve to piston contact. This paper presents an overview of the design solution, a description of the simulation model used, performance and economy data predicted by the model and a discussion of other areas of opportunity where improvements may be possible.

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