Investigation of effect of compression ratio on combustion and exhaust emissions in A HCCI engine

Calam, Alper; Solmaz, Hamit; Yılmaz, Emre; İçıngür, Yakup

doi:10.1016/j.energy.2018.12.023

Cited by 121 publications

(28 citation statements)

References 25 publications

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“…Bu nedenle yanma silindir içi sıcaklık ve basınç geçmişinden, yakıt özelliklerinden ve hava yakıt karışımının kompozisyonundan doğrudan etkilenir [33][34]. HCCI motorlarda egzoz gazlarının resirkülasyonu, sıkıştırma oranı ve ön ısıtma ile hava yakıt karışımının sıcaklığı kontrol edilebilir [35][36][37][38]…”

Section: Gi̇ri̇ş (Introduction)unclassified

Homojen Dolgulu Sıkıştırma ile Ateşlemeli Bir Motorda N-Heptan-Tetrahidrofuran Karışımlarının Yanma, Performans Ve Emisyonlara Etkisi

Calam

2021

Politeknik Dergisi

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Bu çalışmada tek silindirli, port enjeksiyon sistemine sahip homojen dolgulu sıkıştırma ile ateşlemeli motor kullanılmıştır. Düşük basınçlı port enjektöründen referans n-heptan ve tetrahidrofuran-n-heptan karışım yakıtları püskürtülerek, emme ve sıkıştırma zamanı boyunca homojen bir karışım hazırlanmıştır. Silindir içi basınç, ısı dağılımı, yanma başlangıcı, CA50, yanma süresi, indike termik verim, maksimum basınç artış oranı analizi yapılmış ve hidrokarbon ve karbonmonoksit emisyonları belirlenmiştir. Aşırı fakir karışım şartlarında tüm test yakıtları ile silindir içi basınç ve ısı dağılımı azalmıştır. Referans n-heptan yakıtına tetrahidrofuran ilave edilmesi yanma süreçlerinin kontrol edilebilmesini sağlamıştır. En yüksek indike termik verim lambdanın 1.9 olduğu şartlarda TFH60 yakıtı ile %38.14 olarak kaydedilmiştir. N-heptan yakıtına tetrahidrofuran ilavesi yanmayı yavaşlatmıştır. Böylece düşük sıcaklık yanması daha uzun sürede tamamlanmıştır. Aşırı fakir çalışma şartlarında n-heptan-tetrahidrofuran yakıt karışımlarının hidrokarbon ve karbonmonoksit emisyonları referans yakıta göre artış göstermiştir. En yüksek kirletici emisyonlar THF60 yakıtı ile elde edilmiştir. Referans yakıta göre hidrokarbon ve karbonmonoksit ortalama %8.3 ve %54 oranında artmıştır.

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Section: Gi̇ri̇ş (Introduction)unclassified

Homojen Dolgulu Sıkıştırma ile Ateşlemeli Bir Motorda N-Heptan-Tetrahidrofuran Karışımlarının Yanma, Performans Ve Emisyonlara Etkisi

Calam

2021

Politeknik Dergisi

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“…The charge mass is prepared homogeneously as in spark-ignition engines and as likely compression ignition engines the mixture auto-ignited via compression in the HCCI combustion concept. Therefore, combustion occurs simultaneously in whole range in the cylinder [28][29][30]. By considering the mixture preparation and start of the combustion, HCCI engines are explained as an engine in a range of spark ignition and compression ignition engines.…”

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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“…According to many researches, HCCI combustion is proven to be both highly efficient and operating with ultra-low NOx emissions. [4][5][6] However, the combustion phasing of HCCI combustion is difficult to be controlled since it is overly sensitive to boundary conditions. [7][8][9] Hence, closed-loop control algorithms are necessary to stabilize the combustion.…”

Section: Introductionmentioning

confidence: 99%

Ion current–based homogeneous charge compression ignition combustion control using direct water injection

Zhu

Deng

Dewor

et al. 2020

International Journal of Engine Research

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Homogeneous charge compression ignition has proven to be both highly efficient and to operate with ultra-low NOx raw emissions. However, homogeneous charge compression ignition combustion is a dynamic process due to strong cycle-to-cycle coupling effects caused mainly by the residual gas. Compared to conventional spark-ignited and diesel engines, the lack of direct mixture composition and ignition control increases the challenge of combustion instabilities, especially at boundary conditions. To stabilize the combustion process, real-time in-cylinder combustion diagnostics and control are often used. In this study, for the first time, ion current detection technology and direct water injection are combined for homogeneous charge compression ignition combustion control. By analyzing the return map of the crank angle at 50% cumulative heat release under unstable conditions, it was identified that a misfire or incomplete combustion is usually followed by knocking-like early combustion with high cylinder pressure gradients. Through the correlation analysis between ion current and combustion, a cycle-to-cycle closed-loop control strategy was developed and implemented on a rapid control prototyping engine control unit. Real-time calculated ion current parameters were used to predict the 50% cumulative heat release position of the next cycle and prevent early combustion by direct water injection. The calculation results and controller performance were validated on a single-cylinder research engine. With the controller activated, the standard deviation of 50% cumulative heat release and dynamic programming to the max could be reduced by 19% and 11%, respectively. The coefficient of variation of indicated mean effective pressure was reduced by 12%. A slight increase in indicated mean effective pressure after activating the controller also shows the potential for efficiency improvement. Moreover, not only early combustion is controlled, but also late combustion is significantly reduced.

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Investigation of effect of compression ratio on combustion and exhaust emissions in A HCCI engine

Cited by 121 publications

References 25 publications

Homojen Dolgulu Sıkıştırma ile Ateşlemeli Bir Motorda N-Heptan-Tetrahidrofuran Karışımlarının Yanma, Performans Ve Emisyonlara Etkisi

Homojen Dolgulu Sıkıştırma ile Ateşlemeli Bir Motorda N-Heptan-Tetrahidrofuran Karışımlarının Yanma, Performans Ve Emisyonlara Etkisi

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

Ion current–based homogeneous charge compression ignition combustion control using direct water injection

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