A study of swirl ratio effects on the NOx formation and mixture stratification in an RCCI engine

Dadsetan, M.; Chitsaz, Iman; Amani, E.

doi:10.1016/j.energy.2019.06.109

Cited by 19 publications

(5 citation statements)

References 36 publications

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“…Increasing swirl has been shown to reduce the combustion duration in advanced stratified combustion modes by enhancing fuel–air mixing during the compression stroke. 30,31…”

Section: Resultsmentioning

confidence: 99%

“…Increasing swirl has been shown to reduce the combustion duration in advanced stratified combustion modes by enhancing fuel-air mixing during the compression stroke. 30,31 To test the hypothesis that a lack of bulk motion results in significant stratification of the early direct injected wet ethanol, early DI data are collected with the addition of swirl. The swirl ratio of the engine without modification is 0.5.…”

Section: Using Swirl To Reduce In-cylinder Stratificationmentioning

confidence: 99%

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Tailoring thermal stratification to enable high load low temperature combustion with wet ethanol on a gasoline engine architecture

Gainey

Yan

Moser

et al. 2020

International Journal of Engine Research

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Wet ethanol is a biofuel with unique fuel properties: a high latent heat of vaporization and low equivalence ratio sensitivity. These two fuel properties enable control over the heat release process in low temperature combustion through the enhancement of in-cylinder thermal stratification. In this work, it is shown that the direct injection of wet ethanol 80 (80% ethanol, 20% water, by mass) during the intake stroke on a mid-compression ratio engine with a side-mounted gasoline direct injector does not fully premix with incoming air, leaving stratification in the cylinder which elongates the combustion process, enabling high-load low temperature combustion without engine-damaging knock. As a result, the load under naturally aspirated conditions was only limited by oxygen content as the global equivalence ratio approached stoichiometry. The results show that swirl can not only modulate the induced stratification effectively by increasing the amount of bulk motion in the cylinder but also cause a thermal efficiency penalty, since swirl increases heat transfer losses. Modulation over the induced stratification can be achieved without an efficiency penalty by employing either a dual injector system where a fraction of the total fuel is injected into the port or a split injection strategy where a fraction of the total fuel is injected during the compression stroke. This strategy enables high-load low temperature combustion, while reducing the number of regions that form NOx and avoiding excessively rich regions that contribute to combustion inefficiency.

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“…Increasing swirl has been shown to reduce the combustion duration in advanced stratified combustion modes by enhancing fuel–air mixing during the compression stroke. 30,31…”

Section: Resultsmentioning

confidence: 99%

Section: Using Swirl To Reduce In-cylinder Stratificationmentioning

confidence: 99%

Tailoring thermal stratification to enable high load low temperature combustion with wet ethanol on a gasoline engine architecture

Gainey

Yan

Moser

et al. 2020

International Journal of Engine Research

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show abstract

“…At the moment, there are quite a lot of studies in the field of reducing harmful emissions of internal combustion engines, these include mixing hydrogen fuel [1,3,10,12], using modern water injection control systems [2], swirling the flow [4], diluting various types of fuel with liquefied gas [5] or methane [6], diesel [7], catalysis [8], gas recirculation [9], "poor" burning [11].…”

Section: Thematic Scope: Publication Of Papers On Geology and Technical Sciencesmentioning

confidence: 99%

Modeling of the Combustion Process in a Diesel Engine

Dostiyarov¹,

Umishev²,

Saduakasova³

et al. 2021

News of NAN RK. SGTS

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The issues of combustion processes and the organization of the combustion workflow in diesel engines are relevant in view of the tightening of economic and environmental requirements for them. The problem of saving liquid fuels remains one of the most acute in the provision of fuel and energy resources. The development of highly efficient methods for organizing work processes when burning natural gas in a compressed or cryogenic state in the cylinders of internal combustion piston engines and determining ways to further reduce toxic emissions, increase fuel efficiency and reliability in promising gas engines is an urgent task. Mathematical modeling of liquid fuel combustion is a complex task, since it requires taking into account a large number of complex interrelated processes and phenomena. The article presents a simple 3-D model of cylinder diesel tractor engine D 144, the re- sults of numerical simulation of combustion of liquid and gaseous fuel in the cylinder of the diesel engine D-144. The article presents the results of modeling, including graphs of the dependence of nitrogen oxides, particles in outgoing gases, depending on the consumption of gaseous fuel in the form of pure methane. Additionally, tempe- rature and velocity contours are shown. The corresponding conclusions are made.

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“…Girdap (swirl) yoğunluğu arttıkça, hava/yakıt karışma durumu iyileşir ve sonuç olarak, karışımın difüzyon kabiliyeti ve yanma verimi artar (Wang et al, 2019). Aynı zamanda, iyileşen karışma durumunun yanma zamanını kısalttığı da rapor edilmiştir (Yoon et al, 2018;Xu et al, 2019;Dadsetan et al, 2019). Swirl sayısı artışı ile hava/yakıt karışımı ateşlenme bölgesinin brülör çıkışına yaklaşmasının (oluşan resirkülasyon bölgesi yanma sonu ürünleri ve taze karışım arasındaki etkileşimi artırırısı transfer karakteristikleri iyileşir) bu durumdan kaynaklandığı düşünülmektedir.…”

Section: Bulgularunclassified

Kaya Gazı Karışımlarının Yanma ve Emisyon Davranışlarının Laboratuvar Ölçekli Bir Yakıcıda Sayısal Olarak İncelenmesi

Yılmaz

2019

Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Bu çalışmada, kaya gazı karışımlarının yanma ve emisyon davranışlarına yakıt bileşimi ve swirl sayısının etkileri laboratuvar ölçekli bir yakıcıda sayısal olarak incelenmiştir. Bu maksatla, deneysel olarak test edilmiş ön karışımlı bir yakıcının iki boyutlu bir modeli oluşturulmuştur. Bu modelde metan/hava yanması simule edilmiş ve elde edilen sonuçlar, oluşturulan modelin doğrulanması için deneysel veriler ile kıyaslanmıştır. Sayısal çalışmalar hesaplamalı akışkanlar dinamiği yazılımı, ANSYS/Fluent kullanılarak gerçekleştirilmiştir. Test edilen kaya gazı karışımları; %86 CH4-%14 C2H6, %81 CH4-%10 C2H6-%9 N2 ve %58 CH4-%20 C2H6-%12 C3H8-%10 CO2'dir. İlgili karışımların yanma ve emisyon davranışları, yanma odası boyunca sıcaklık ve tür (CO2 ve NOx) dağılımları incelenerek belirlenmiştir. Elde edilen sonuçlar; %86 CH4-%14 C2H6 karışımının yanma ve emisyon performansı bakımından avantajlı olduğunu; NOx emisyonunun gaz kompozisyonuna ve swirl sayısına son derece bağımlı olduğunu ve eksenel sıcaklık değerleri ve reaksiyon hızının swirl sayısı ile doğru orantılı olduğunu göstermiştir.

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A study of swirl ratio effects on the NOx formation and mixture stratification in an RCCI engine

Cited by 19 publications

References 36 publications

Tailoring thermal stratification to enable high load low temperature combustion with wet ethanol on a gasoline engine architecture

Tailoring thermal stratification to enable high load low temperature combustion with wet ethanol on a gasoline engine architecture

Modeling of the Combustion Process in a Diesel Engine

Kaya Gazı Karışımlarının Yanma ve Emisyon Davranışlarının Laboratuvar Ölçekli Bir Yakıcıda Sayısal Olarak İncelenmesi

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