Load limits of an HCCI engine fueled with natural gas, ethanol, and methanol

Gharehghani, Ayat

doi:10.1016/j.fuel.2018.11.066

Cited by 96 publications

(29 citation statements)

References 34 publications

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“…Further, carbon monoxide, unburned hydrocarbon emissions were lower with natural gas than both alcohols. 110 Similarly, ethanol or ethyl alcohol (C 2 H 5 OH) is a colorless, volatile and flammable liquid that burns with a smokeless blue flame which is generally invisible in normal light. 111 Ethanol is primarily produced from biomass sources like sugar cane products and thus, is a renewable fuel.…”

Section: Fuel Effects In Diesel Ltcmentioning

confidence: 99%

Prospective fuels for diesel low temperature combustion engine applications: A critical review

Krishnasamy

Gupta

Reitz

2020

International Journal of Engine Research

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Low Temperature Combustion (LTC) strategies are most promising to simultaneously reduce oxides of nitrogen (NOx) and soot emissions from diesel engines along with offering higher thermal efficiency. Commercial wide spread implementation of diesel LTC strategies requires several challenges to be addressed, including lack of precise ignition timing control, widening the narrow operating load ranges and reducing high unburned fuel emissions. These challenges can be addressed through modifications in the engine or fuel design or both. The timing and rate of combustion in several LTC strategies are controlled primarily by the chemical kinetics of the fuel. Since, diesel fuel reactivity and volatility are tailor-made to perform well under conventional diesel combustion conditions, its application in LTC poses several problems, as highlighted in this paper. Hence, it is important to identify suitable alternative fuels for the different diesel LTC strategies. The published literature on LTC over the past 25 years is critically analyzed to discuss the evolution of the different diesel LTC strategies, their operability limits, the challenges and the controlling parameters for each strategy. This is followed by in-depth analysis of the role of the fuel and the fuel requirements for each strategy. Further, the importance of adopting a hybrid surrogate modeling approach to enable numerical simulation of diesel LTC is highlighted. A novel attempt of relating various diesel low temperature combustion (LTC) strategies based on the approach followed to achieve positive ignition dwell through different injection strategies, utilizing high exhaust gas recirculation (EGR), and dual fuels is presented. The need for replacing diesel with alternative liquid fuels in LTC strategies is presented by highlighting the fundamental problems associated with diesel fuel characteristics. The review concludes by suggesting potential alternative fuels for various diesel LTC strategies and provides directions for future work to address the challenges facing compression ignition LTC operation.

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Section: Fuel Effects In Diesel Ltcmentioning

confidence: 99%

Prospective fuels for diesel low temperature combustion engine applications: A critical review

Krishnasamy

Gupta

Reitz

2020

International Journal of Engine Research

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“…İçten yanmalı motorlarda kümülatif ısı dağılımının %10'unun gerçekleştiği krank açısı yanma başlangıcı olarak ifade edilmektedir (Heywood, 1988 İçten yanmalı motorlarda kümülatif ısı dağılımının %50'sinin gerçekleştiği krank açısının yeri (CA50) indike termik verimi doğrudan etkilemektedir (Heywood, 1988 (Heywood, 1988 (Heywood, 1988;Zhao, 2007 (Gharehghani, 2019)…”

Section: şEkil 2 Hfk'ya Bağlı Silindir Içi Basınç Ve ıSı Dağılımının Değişimiunclassified

“…Basınç artış oranı, krank açısı başına piston üzerine uygulanan basıncı ifade etmektedir. İçten yanmalı motorlarda basınç artış oranının 10 Bar/ o KA üzeri kararsız çalışma şartları olarak ifade edilmektedir (Zhao, 2007) (Gharehghani, 2019). Hava fazlalığının 1,8'den daha fazla olduğu fakir karışımlarda; E15 test yakıtı kullanımı ile CO ve HC emisyonlarında sırasıyla ortalama olarak %85 ve %11, E25 test yakıtı kullanımında ise CO ve HC emisyonlarında sırasıyla ortalama olarak %300 ve %27 kötüleşme gözlenmiştir.…”

Section: Introductionunclassified

Experimental Investigations of Performance, Combustion and Emission Characteristics of Ethanol Fueled HCCI Engine

Calam

Halis

2020

Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Bu çalışmada dört zamanlı, tek silindirli, port enjeksiyonlu bir benzinli motordan (SI) homojen dolgulu sıkıştırma ile ateşlemeli motora (HCCI) dönüşümü yapılmış Ricardo Hydra test motoru kullanılmıştır. Referans heptan ve heptan/etil alkol karışımlarının (E15 ve E25) yanma, motor performansı ve egzoz emisyonlarına etkisi deneysel olarak incelenmiştir. Emme havası giriş sıcaklığı 60℃'de sabitlenmiş ve motor hızı 800 rpm olarak belirlenmiştir. Farklı hava fazlalık katsayısı (HFK) değerlerinde silindir içi basınç, ısı dağılımı, yanma başlangıcı, CA50, yanma süresi, indike termik verim, indike ortalama efektif basınç (IMEP) ve egzoz emisyon sonuçları incelenmiştir. Heptan yakıtına etil alkol ilavesi yanmanın gecikmeye alınarak uzamasına neden olmuştur. Ayrıca yanmanın yavaşlatılması sağlanmıştır. Buna bağlı olarak basınç artış oranı azalarak HCCI yanma kontrol altına alınmıştır. En yüksek indike termik verim E15 yakıtı kullanımında HFK'nın 2 olduğu şartlarda %49 olarak belirlenmiştir. En yüksek IMEP E25 yakıtı kullanımında HFK'nın 1,3 olduğu şartlarda 6,1 bar olarak tespit edilmiştir. CO ve HC emisyonları ise heptan yakıtına etil alkol ilave edilmesi ile eş zamanlı olarak artış göstermiştir. Karışım yakıtları kullanımında silindir içi gaz sıcaklıklarının heptana göre düşük olması, yüksek emisyon değerlerinin temel nedeni olduğu ifade edilebilir. E15 yakıtının uygun çalışma şartlardında ideal yakıt olduğu bu çalışma ile ifade edilebilir.

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“…As an low temperature combustion mode, the main advantages of the homogeneous charge compression ignition (HCCI) combustion mode low NOx and smoke emissions simultaneously without any loss in the thermal efficiency for the same compression ratio [19][20][21][22][23][24][25]. Onishi and Noguchi conducted the first studies related to the HCCI combustion in 1979 [26,27].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Usage of RON68 and Naphtha in an HCCI Engine

Yılmaz¹

2020

International Journal of Automotive Science and Technology

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The depletion of fossil fuels as a result of excessive use and increased environmental pollution brought up the research of environmentally conscious and renewable alternative fuels. The alternative fuel to be considered for internal combustion engines should not decrease the performance of the engine too much and positively affect the exhaust emissions. It is also important that this fuel should provide some specifications such as easy producibility, low cost, availability and usability in internal combustion engine without modification. Low temperature combustion modes are promising technologies providing nearly zero NOx and soot emissions and currently a lot of researcher has focused on this technology. In this experimental study naphtha was tested in an HCCI engine. In order to examine and understand the effects of the naphtha on HCCI mode a comparison study was also conducted by using RON68. Maximum imep was computed as 3.23 and 3.32 bar with RON68 and naphtha respectively at λ=1.7. SOC was determined 5.4 °CA and 5.76 °CA ATDC with naphtha and RON68 at λ=2. CA50 is far away from TDC fact that net work decreases. Maximum ITE was calculated as 45.42% and 46.07% at λ=2 with RON68 and naphtha respectively.

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Load limits of an HCCI engine fueled with natural gas, ethanol, and methanol

Cited by 96 publications

References 34 publications

Prospective fuels for diesel low temperature combustion engine applications: A critical review

Prospective fuels for diesel low temperature combustion engine applications: A critical review

Experimental Investigations of Performance, Combustion and Emission Characteristics of Ethanol Fueled HCCI Engine

A Comparative Study on the Usage of RON68 and Naphtha in an HCCI Engine

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