Homogeneous Charge Compression Ignition Combustion: Challenges and Proposed Solutions

Najafabadi, Mohammad Izadi; Aziz, Nuraini Abdul

doi:10.1155/2013/783789

Cited by 34 publications

(18 citation statements)

References 80 publications

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“…The clearance between the pistons (4) and (5) was filled with oil and connected with the hydraulic accumulator clearance volume. The motion of the hydraulic accumulator piston (6) was limited by the regulation screw (9). The variable of the hydraulic accumulator clearance volume changed idle stroke of the cam piston (4), thus reducing the active part of the cam lift.…”

Section: Research Engine and Measurement Instrumentationmentioning

confidence: 99%

“…Uniform in-cylinder temperature and a high degree of mixture dilution enable a substantial reduction in nitrogen oxides emission. Additionally, spontaneous combustion of the whole in-cylinder volume results in high thermal efficiency [5,6]. The most feasible approach to HCCI combustion is the utilization of negative valve overlap (NVO) that results in exhaust gas trapping.…”

Section: Introductionmentioning

confidence: 99%

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On Cyclic Variability in a Residual Effected HCCI Engine with Direct Gasoline Injection during Negative Valve Overlap

Hunicz¹

2014

Mathematical Problems in Engineering

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This study contributes towards describing the nature of cycle-by-cycle variability in homogeneous charge compression ignition (HCCI) engines. Experimental measurements were performed using a single cylinder research engine operated in the negative valve overlap (NVO) mode and fuelled with direct gasoline injection. Both stoichiometric and lean mixtures were applied in order to distinguish between different exhaust-fuel reactions during the NVO period and their propagation into the main event combustion. The experimental results show that the mode of cycle-by-cycle variability depends on the NVO phenomena. Under stoichiometric mixture conditions, neither variability in the main event indicated mean effective pressure (IMEP) nor the combustion timing was affected by the NVO phenomena; however, long period oscillations in IMEP were observed. In contrast, for lean mixture, where fuel oxidation during the NVO period took place, distinctive correlations between NVO phenomena and the main event combustion parameters were observed. A wavelet analysis revealed the presence of both long-term and short-term oscillations in IMEP, in accordance with the extent of NVO phenomena. Characteristic patterns in IMEP were recognized using an in-house algorithm.

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Section: Research Engine and Measurement Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On Cyclic Variability in a Residual Effected HCCI Engine with Direct Gasoline Injection during Negative Valve Overlap

Hunicz¹

2014

Mathematical Problems in Engineering

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“…SI ve CI motorlardan farklı olarak HCCI motorlarda yanma başlangıcını kontrol eden bir mekanizma bulunmamaktadır. HCCI motorlarda yanma, kendi kendine başlamaktadır [6]. Yao Zheng ve ark.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Hava Fazlalık Katsayısı ve Oktan Sayısı Değişiminin HCCI Yanma Karakteristiklerine ve Motor Performansına Etkileri

Calam¹,

İçıngür²

2018

Journal of Polytechnic

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Bu makaleye şu şekilde atıfta bulunabilirsiniz(To cite to this article): Calam A. ve İçingür Y. "Hava fazlalık katsayısı ve oktan sayısı değişiminin HCCI yanma karakteristiklerine ve motor performansına etkileri", Politeknik Dergisi, 22(3): 607-618, (2019).Erişim linki (To link to this article): http://dergipark.org.tr/politeknik/archive ÖZ Homojen dolgulu sıkıştırma ile ateşlemeli (HCCI) motorlar yüksek termik verimleri ve düşük egzoz emisyonları nedeniyle mevcut içten yanmalı motorlara alternatif bir yanma modelidir. Bu çalışmada, port tipi enjeksiyonlu, tek silindirli bir HCCI motorda hava fazlalık katsayısının ve oktan sayısının HCCI yanması üzerine etkileri deneysel olarak incelenmiştir. Deneyler tam yük şartlarında, 60 o C emme havası giriş sıcaklığında ve 800 min -1 motor hızında yapılmıştır. Ayrıca deneyler farklı hava fazlalık katsayılarında yapılmıştır. Oktan sayısının artırılması ile maksimum silindir içi basıncın oluşum noktası daha geç krank açılarında gerçekleşmiştir. Oktan sayısının artırılması yanma süresinin uzamasına neden olmuştur. Hava/ yakıt oranının artması basınç artış oranını azaltmıştır. Hava/yakıt oranının azaltılması silindir içerisine sürülen enerji miktarını artırmıştır. Böylece en yüksek silindir içi basınçlar bu şartlar altında elde edilmiştir. En yüksek indike termik verim RON60 yakıtı kullanımında, hava yakıt oranının 2,14 olduğu şartlarda % 40,6 olarak tespit edilmiştir. Hava yakıt oranının azaltılması yanmanın erken gerçekleşmesini sağlamıştır. Bu nedenle net iş azalmıştır. Böylece indike termik verim de azalmıştır.Anahtar Kelimeler: Hava yakıt oranı, HCCI, yanma, RON20, RON60, egzoz emisyonları. ABSTRACTHomogeneous compression ignition (HCCI) engines are an alternative combustion model to existing internal combustion engines due to their high thermal efficiency and low exhaust emissions. In this study, the effects of air fuel ratio and octane number on combustion and engine performance characteristics were investigated with port type injection single cylinder HCCI engine. Experiments were carried out at full load conditions, intake temperature of 60 o C and 800 rpm engine speed. Also, experiments were carried out with different air excess coefficients. The maximum in-cylinder pressure occured at a later crank angle by increasing the number of octane. Increasing the octane number has caused the increase of the combustion duration. The increase of air fuel ratio decreases the pressure rise rate. Decreases of air fuel ratio has increased the amount of injected energy to the cylinder. So that, the highest in-cylinder pressures are obtained under these conditions. The highest indictical thermal efficiency 40.6 %, provided that the air fuel ratio was 2.14 with using RON60 fuel. Decreases of air fuel ratio caused the combustion advance. For this reason net work decreased. Thereby, indicated thermal efficiency decreased.

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“…Today, engine advancements are designed via technological platforms for better and accurate results. The HCCI combustion engine offers potential advancement for engine designs due to high efficiency, low particulate matter emissions, and low nitrogen oxide [15,16]. Numerical simulations are commonly used today to achieve greater flexibility in engine designs with lower cost.…”

Section: Introductionmentioning

confidence: 99%

The use of different types of piston in an HCCI engine: A review

Aljaberi¹,

Hairuddin²,

Aziz³

2017

Int. J. Automot. Mech. Eng.

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Homogenous charge compression ignition (HCCI) combines the advantages of spark ignition (SI) and compression ignition (CI) engines to improve fuel consumption and emission levels. HCCI engines have the advantage of relatively higher engine efficiency than SI engines while maintaining lower emissions levels than CI engines. Combustion in HCCI engines occurs spontaneously at any location once the fuel-air mixture reaches its chemical activation energy. Pistons have a major effect on controlling the combustion inside the combustion chamber of an HCCI engine. Many researchers have studied various designs for pistons to improve HCCI engines. The aim of this study is to explore these different types of pistons and their designs in terms of improving the performance of HCCI engines fuelled with gasoline. The most common pistons used in HCCI are twostroke pistons, bowl types, specialised pistons, and dome-shaped pistons; each offers distinct advantages and disadvantages. Software simulation is the latest way of determining the best piston to be used for HCCI engines, as it is more cost effective and less time consuming than experiments. Overall, bowl type pistons offer reduced fuel consumption and a higher load capacity when used in an HCCI engine.

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Homogeneous Charge Compression Ignition Combustion: Challenges and Proposed Solutions

Cited by 34 publications

References 80 publications

On Cyclic Variability in a Residual Effected HCCI Engine with Direct Gasoline Injection during Negative Valve Overlap

On Cyclic Variability in a Residual Effected HCCI Engine with Direct Gasoline Injection during Negative Valve Overlap

Hava Fazlalık Katsayısı ve Oktan Sayısı Değişiminin HCCI Yanma Karakteristiklerine ve Motor Performansına Etkileri

The use of different types of piston in an HCCI engine: A review

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