Bir HCCI motorun 0-boyutlu yanma analizi

Bu çalışmada, homojen karışımlı sıkıştırma ile ateşlemeli (HCCI) bir motorda yanma analizi yapılmıştır. Analizde, sıfır boyutlu yanma ve kimyasal mekanizma analizi yapılabilen Chemkin-Pro programı kullanılmıştır. Analiz sonuçları Shell araştırma merkezinde yapılan deney sonuçları ile doğrulanmıştır. Chemkin-Pro ile deneysel ortamlarda elde edilen veriler kullanılarak üretilen mekanizmalar ile değişik durumlara ait analizler hızlı bir şekilde yapılabilmektedir. Motor içerisindeki yanmanın analizini yapabilmek için hazırlanmış kimyasal kinetik mekanizmalar mevcuttur. Analizlerde deneysel motorda test edilen PRF yakıta uygun iki adet kimyasal kinetik mekanizma kullanılmıştır. Aynı yakıt için geliştirilen iki farklı kimyasal mekanizmanın deneysel sonuçlara olan yakınlıklarına göre performansları incelenmiştir. Ayrıca diğer bir performans kriteri olarak çözücülerin ve mekanizmaların toplam analiz süresine etkileri de incelenmiştir. Analiz sonuçları, deneysel olarak mevcut olan basınç değerleri ile kıyaslanmıştır. Chemkin-Pro programında detaylı piston modellemesi olmadığından dolayı deneysel basınç değerleri ile analiz sonuçları arasında farklılıklar görülmüştür. Deneysel olarak elde edilen CO, CO2 ve O2 yanma sonu ürünleri de analiz sonuçları ile kıyaslanmış ve çok yakın sonuçlar elde edilmiştir. Deneysel olarak elde edemediğimiz sıcaklık ve yakıt değerleri için kimyasal kinetik mekanizmalar arasında kıyaslama yapılmıştır

Zero dimensional combustion analysis of an HCCI engine

In this study, experimental results from a homogenous charge compression ignition (HCCI) engine fueled with PRF- 85 (85% iso-octane and 15% n-heptane) were used to zero dimensional. In this study, combustion analysis of homogenous charge compression ignition (HCCI) engine are examined. In the analysis, chemkin-pro software was used which can analysis 0-D combustion and chemical mechanism. Anlysys results are compared with the results of Shell research center. With the help of Chemkin-Pro, results of experiments and various combination mechanisms results can be easily compared. Prepared chemical kinetic mechanisms exist in order to make the analysis inside the engineer. Two chemical kinetic mechanism which is compatible to PRF fuel are used inside the experimental engine. Two different chemical which were developed for the same fuel are examined based on performance similarities on the experiments. Besides, effect of solvents and mechanism on total analysis time are also studied as performance criteria. Analysis results are compared with the existing experimental the pressure values. Since there is not a piston modeling inside the Chemkin-Pro, differences between experimental pressure values and analysis results are observed. Experimentally obtained combustion products of CO, CO2 ve O2 are also compared with the analysis results and similar results are observed.Temperature and fuel results which can not be obtained via experimentally are compared with the kinetic mechanisms.

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