Multi-Dimensional Modeling of Combustion and Pollutants Formation of New Technology Light Duty Diesel Engines

Belardini, P.; Bertoli, C.

doi:10.2516/ogst:1999022

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…Due to their advantages in controlling fuel economy, direct-injection (DI) systems appear to be a key to the successful application of the spark ignition engine in the commercial passenger car market. However, mechanisms that can lead to a reduction in exhaust emissions should be planned properly to meet the requirements of regulations such as Euro IV − after all, a common DI engine produces relatively high levels of CO and NOx emissions (Belardini and Bertoli, 1999).…”

Section: Introductionmentioning

confidence: 99%

Emission analysis of a compressed natural gas directinjection engine with a homogenous mixture

Abdullah

Kurniawan

Khamas

et al. 2011

Int.J Automot. Technol.

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In an era in which environmental pollution and depletion of world oil reserves are of major concern, emissions produced by automotive vehicles need to be controlled and reduced. An ideal solution is to switch to a cleaner fuel such as natural gas, which generates cleaner emissions. In addition, control over the in-cylinder air-fuel mixture can be best achieved through a direct-injection mechanism, which can further improve combustion efficiency. This need for cleaner automobiles provides the motivation for this paper's examination of the use of computational fluid dynamic (CFD) simulations to analyze the concentrations of the exhaust gases produced by a compressed natural gas engine with a direct-fuel-injection system. In this work, a compressed natural gas direct-injection engine has been designed and developed through a numerical simulation using computational fluid dynamics (CFD) to provide an insight into complex in-cylinder behavior. The emissions analyzed in this study were carbon monoxide (CO), nitric oxide (NO) and carbon dioxide (CO 2 ), i.e. the main pollutants produced by natural gas combustion. Based on a stoichiometric mixture, the concentrations of CO and NO were computed using the dissociation of carbon dioxide and the extended Zeldovich mechanism. CO 2 was calculated using a mass balance of the species involved in the combustion process. The simulation results were then compared with the experimental data generated by a single-cylinder research engine test rig. A good agreement was obtained with the experimental data for the engine speeds considered for all emissions concentrations.

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Section: Introductionmentioning

confidence: 99%

Emission analysis of a compressed natural gas directinjection engine with a homogenous mixture

Abdullah

Kurniawan

Khamas

et al. 2011

Int.J Automot. Technol.

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“…Yapılan karşılaştırmalar, HAD çözümlerine uygulanan beş türbülans modeli için 1800 d/dak. motor hızlarında yapılmış ve sonuç olarak RNG k-ε modelinin en uygun türbülans modeli olduğunu göstermiştir ki bu literatürle de uyum içindedir (Belardini, 1999). Patterson ve diğ.…”

Section: Introductionunclassified

Ağir İş Di̇zel Motoru Si̇li̇ndi̇ri̇ İçeri̇si̇ndeki̇ Soğuk Hava Akişinin Sayisal İncelenmesi̇

Ayaz¹,

Köten

Çadırcı

2018

Marmara Fen Bilimleri Dergisi

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ÖzBu çalışmada, lokomotiflerde kullanılan ağır iş dizel motorunun silindiri içerisindeki soğuk hava akışı ve oluşan girdaplar Hesaplamalı Akışkanlar Dinamiği (HAD) yöntemi ile hareketli çözüm ağı kullanılarak modellenmiştir. Ele alınan motor silindirinde emme ve egzoz portları, valfleri ve ön yanma odalı tip yanma odası vardır. Krank açısına göre değişen piston ve emme-egzoz supapları için hareketli çözüm ağı kullanılmıştır, soğuk hava akışı RNG k-ε türbülans modeli kullanılarak modellenmiş ve emme ve sıkıştırma işlemlerinde yanma odası içerisindeki hız, türbülans kinetik enerjisi (TKE) ve girdap oranları incelenmiştir. HAD analizleri mevcut motorun modernize edilerek farklı yanma odası tasarımları ile sıkıştırma işlemi sonunda daha yüksek TKE'sine ulaşabileceğini göstermektedir. Sıkıştırma işlemi sonunda girdap oranının yeterince artmadığı ve ön yanma odası içerisinde, ana yanma odasına göre daha yüksek hızlara ulaşıldığı görülmüştür. Bu çalışma neticesinde TKE ve girdap oranı üzerinden yapılan değerlendirmeler ile motor performansı açısından mevcut ağır iş dizel motoru yanma odasının iyileştirilmesi gerekliliği ortaya çıkarılmıştır. Mevcut ağır iş tipi dizel motorunda silindir içerisindeki NOx emisyonlarında kötüleşme olmayacak şekilde girdap oranını belli ölçüde arttırmak veya farklı girdap oranı oluşturabilecek yanma odası tiplerini denemek uygulanabilecek tasarımsal önlemler arasındadır. Ayrıca TKE artırımı ile hava yakıt karışımını arttırmak için yanma sonu gazlarının tahliyesi için gerekli olan supap bindirme süresini azaltmak da uygulanabilecek bir önlemdir. AbstractIn this study, cold air flow and related swirls occurring in the cylinder of a heavy-duty diesel engine in locomotives was investigated by means of Computational Fluid Dynamics (CFD) using a moving mesh. The engine cylinder of interest has intake and exhaust ports, valves and combustion chamber with pre-combustion chamber. A moving mesh was used for the crankshaft-dependent motion of the piston and intake exhaust valves, and the cold air flow was modeled using the RNG k-ε turbulence model and the velocities, turbulence, kinetic energy (TKE) and swirl ratios (SR) in the combustion chamber during intake and compression processes were investigated. At the end of the compression process, the swirl ratio did not increase sufficiently and higher velocities were achieved in the pre-combustion chamber than in the main combustion chamber. As a result of this study, evaluations based on TKE and swirl ratio have revealed the necessity of improving the current heavy-duty diesel engine combustion chamber for better engine performance. In the current heavy-duty diesel engine, it is possible to increase the swirl rate without any deterioration in the NO x emissions in the cylinder or to try new types of combustion chambers that can create different swirl ratio.

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Combustion Patterns in Common Rail D.I. Engines Inferred by Experiments and CRD. Computations

Beatrice¹,

Belardini

Sertoli

et al. 2001

Combustion Science and Technology

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Multi-Dimensional Modeling of Combustion and Pollutants Formation of New Technology Light Duty Diesel Engines

Cited by 5 publications

References 18 publications

Emission analysis of a compressed natural gas directinjection engine with a homogenous mixture

Emission analysis of a compressed natural gas directinjection engine with a homogenous mixture

Ağir İş Di̇zel Motoru Si̇li̇ndi̇ri̇ İçeri̇si̇ndeki̇ Soğuk Hava Akişinin Sayisal İncelenmesi̇

Combustion Patterns in Common Rail D.I. Engines Inferred by Experiments and CRD. Computations

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