İKİ ZAMANLI TERS-DOĞRU AKIŞLI BENZİNLİ BİR MOTORUN YANMA ANALİZİ

Schnürle tip iki zamanlı motorların kusurlarını ortadan kaldırmak amacıyla geliştirilen süpürme yöntemlerinden biri olan ters-doğru akışlı tip süpürme yöntemi üzerine yapılan çalışmaların çoğu akış süreçlerinin geliştirilmesi ve motor performansının belirlenmesi ile alakalıdır. Bu güne kadar bu tip motorların yanma karakteristiklerine ilişkin hiçbir çalışma yayınlanmamıştır. Bu çalışmada, gerçek zamanlı bir yanma analizi sistemi, yanma değerlerinin çevrimiçi analizi ve verilerin toplanması için iki zamanlı ters-doğru akışlı benzinli bir motora deneysel olarak uygulanmıştır. Deneyler tam yükte, 1800 1/min'de ve ateşleme avansının ÜÖN'dan önce 16-24 ºKMA arasında 4 er birimlik adımlarla değiştirilmesi ile gerçekleştirilmiş ve silindir basıncı, kütlesel yanma oranı profili, ısı salınımı hızı ve indike verim değişimleri incelenmiştir. Bu verilerin analizi, maksimum indike verimi veren ideal yanma fazının tespitini mümkün kılar. Yapılan testler, test motoru için en ideal yanma fazının ateşleme avansının ÜÖN'dan önce 20 ºKMA'ya ayarlanması ile elde edildiğini göstermiştir

COMBUSTION ANALYSIS OF A TWO STROKE REVERSE-UNIFLOW GASOLINE ENGINE

Most of the studies conducted on reverse-uniflow type scavenging method developed in order to remove the deficiencies of the Schnürle type two stroke engines are related with developing flow processes and determining engine performance. Until today, no studies related with combustion characteristics of these engines were published. In this study, a real time combustion analysis system was experimentally applied to a two stroke reverse-uniflow engine for online analysis of the combustion values and gathering data. The experiments were conducted under full load, 1800 1/min and by changing ignition timing before TDC between 16 -24 ºCA by steps of 4 units each and accordingly cylinder pressure, mass fraction burned profile, heat release rate and indicated efficiency changes were examined. The analysis of this data allows the determination of ideal combustion phase providing maximum indicated efficiency. The performed tests show that most ideal combustion phase was obtained by adjusting the ignition timing to 20 ºCA before TDC

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