Farklı Ortam Koşullarında Dışa Doğru Açılan Piezoelektrik Benzin Enjektöründe Püskürtme Karakteristiklerinin Sayısal Olarak İncelenmesi

Bu çalışmada, dışa doğru açılan bir enjektörün püskürtme karakteristikleri nümerik olarak incelenmiştir. Soğukta ilk çalıştırmada içten yanmalı motorun sıcaklık ve basınç durumları dikkate alınarak nümerik analizler yapılmıştır. Bu parametrelerin buharlaşma hızı, penetrasyon, püskürtme morfolojisi, yakıt püskürtme açısı ve Sauter Ortalama Çapı üzerindeki etkileri ele alınmıştır. N-heptan yakıtı kullanılmış ve Kelvin-Helmholtz / Rayleigh-Taylor ayrılma modeli benimsenmiştir. Analizler, Fluent yazılımı ile kapsamlı olarak gerçekleştirilmiştir. Sonuçların literatürde yer alan deneysel verilerle uyum içinde olduğu görülmüştür. Artan ortam basıncı vorteks oluşumunu şiddetlendirmiş, yakıt nüfuziyet derinliğini azaltmış ve daha kompakt bir yakıt demeti oluşturarak yakıt püskürtme açısını azaltmıştır. Ayrıca, sıcaklık parametresinin buharlaşma üzerindeki etkisinin basınç parametresinden daha az etkili olduğu tespit edilmiştir.

NUMERICAL INVESTIGATION OF THE SPRAY CHARACTERISTICS IN AN OUTWARDLY-OPENING PIEZOELECTRIC GASOLINE INJECTOR FOR DIFFERENT AMBIENT CONDITIONS

In this study, the spray characteristics of an outwardly-opening injector have been investigated numerically. Numerical analyses are carried out by taking temperature and pressure statuses of the internal combustion engine in cold temperature operations into consideration. The effects of these parameters on the evaporation rate, penetration, spray morphology, angle of the fuel spray and the Sauter Mean Diameter were key issues to be addressed. N-heptane fuel was used and the Kelvin-Helmholtz / Rayleigh-Taylor breakup model was adopted. The analyses were performed in the comprehensive environment of Fluent software. It was observed that the results complied with experimental data taking part in literature. Consequences demonstrated that increasing the ambient pressure intensified vortex formation, decreased penetration and increased fuel cone angle by forming a more compact fuel bundle. In addition, it was ascertained that theeffect of the temperature parameter on the evaporation was less effective than the pressure parameter.

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