Investigation of the Effects of Injection Timing on Engine Performance and Formation of Emission in Homogeneous Charge Compression Ignition Engines

Yıl 2019, Cilt: 12 Sayı: 3, 1217 - 1231, 31.12.2019

Müjdat Fırat , İsmail Türkbay

https://doi.org/10.18185/erzifbed.464526

Öz

Homogeneous
charge compression ignition engines are considered to be promising in studying
areas due to their low NOx and soot emissions. Particularly, it is aimed to
improve combustion by changing the injection strategies of diesel fuel. In this
study, different spray timing for a homogeneous charge compression ignition
engine was investigated under
diesel engine conditions. Also, the AVL-FIRE numerical software was used in
this study. Further, injection timing was examined at -150CA, -120CA,
-90CA, -60CA and -30CA before the top dead center (BTDC). The injection was completed 5CA after TDC for all injection timings. The results showed that high temperatures, high NOx and soot emissions
were obtained at early injection timing. Especially, lower NOx and soot emissions were obtained in the retarded
injection timings such as -90KA and -60KA. However, in the case of late injection, CO emissions were increased.

Anahtar Kelimeler

Homogeneous charge compression ignition (HCCI) engines, Injection timing

Homojen Dolgulu Sıkıştırma Ateşlemeli Motorlarda Enjeksiyon Zamanlamasının Motor Performansı ve Emisyon Oluşumuna Etkilerinin İncelenmesi

Öz

Homojen dolgulu sıkıştırma ateşlemeli motorlar düşük NOx ve is emisyonları sağlaması sebebiyle umut verici çalışma alanları olarak görülmektedir. Özellikle dizel yakıtının püskürtme stratejilerinin değiştirilmesiyle yanmanın iyileştirilmesi hedeflenmektedir. Bu çalışma kapsamında dizel motor şartları altında homojen dolgulu sıkıştırma ateşlemeli bir motor için krank açısına (KA) bağlı farklı püskürtme zamanlaması araştırılmıştır. Çalışma AVL-FIRE sayısal yazılımı kullanılarak gerçekleştirilmiştir. Enjeksiyon üst ölü noktadan (ÜÖN) önce sırasıyla -150KA, -120KA, -90KA, -60KA ve -30KA’nda başlayan zamanlamalar için incelenmiştir. Tüm püskürtme zamanlamaları için enjeksiyon ÜÖN’dan 5KA sonra tamamlanmıştır. Çalışmalar sonucunda erken enjeksiyon zamanlamalarında yüksek sıcaklıklar ve kısmen yüksek NOx ve is emisyonları elde edilmiştir. Özellikle -90KA ve -60KA gibi geciken enjeksiyon zamanlamalarında daha düşük NOx ve is emisyonları elde edilmiştir. Fakat enjeksiyonun daha geç yapılması durumunda ise CO emisyonlarının arttığı gözlenmiştir.

Anahtar Kelimeler

Homojen dolgulu sıkıştırma ateşlemeli motorlar, Enjeksiyon zamanlaması, Yanma, Kirletici emisyonlar

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