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Energy demand at a global level is increasing day by day and fossil fuel resources are on the verge of becoming extinct. The drastic increase of the oil prices in the global oil market and the increased pollution levels created an interest to find renewable, sustainable and alternative fuels. Natural gas (NG) is considered as a most prominent alternative fuel due to its many advantages including its ready availability and its low emission levels. A diesel engine was converted to operate in dual fuel engine mode in which Compressed Natural Gas (CNG) was injected using a specially developed electronic control unit (ECU) into the intake manifold while injected pilot biodiesel autoignites and it becomes a source of ignition for CNG. Experimental investigations were conducted over a single cylinder water cooled four stroke dual fuel CI engine test rig operated using Diesel, Honge methyl ester (HOME), Jatropha methyl ester (JOME) and their blends with 15% ethanol as injected pilot fuels and CNG as injected primary fuel. ECU was used for varying the injection timings and injection durations for CNG injection while the optimum injection timing for diesel/biodiesel was maintained at 27°bTDC. The pilot fuel injection pressure was maintained at 230 bars. Engine was operated with constant compression ratio of 17.5 and CNG flow rate was maintained at 0.5 kg/h. The experimental results showed that an injection timing of 5obTDC and injection duration of 60o CA for CNG injection was found to be optimum based on the improved performance, combustion and emission characteristics. The brake thermal efficiency for manifold injected CNG- diesel/biodiesel-ethanol blended dual fuel operation at 80% load was found to be 27.1%, 26.2% and 25.2% for diesel- ethanol blend, HOME-ethanol blend and JOME-ethanol blends respectively. The carbon exhaust emissions and smoke emissions were found to be lesser in CNG injected dual fuel operation compared to CNG inducted dual fuel operation. Ozet: Kuresel duzeyde enerji talebi gun ve fosil yakit kaynaklarinin gecen gun yok olma esiginde bulunmaktadir artmaktadir. Kuresel petrol piyasasinda petrol fiyatlarinin ciddi artis ve artan kirlilik seviyeleri, yenilenebilir, surdurulebilir ve alternatif yakitlar bulmak icin bir ilgi yaratti. Dogalgaz (NG) nedeniyle hazir kullanilabilirlik ve dusuk emisyon seviyeleri de dahil olmak uzere pek cok avantaji bir en onemli alternatif yakit olarak kabul edilmektedir. Bir dizel motor Sikistirilmis Dogal Gaz (CNG), pilot biyodizel Kendiliginden tutusma enjekte ederken emme manifolduna ozel olarak gelistirilmis elektronik kontrol unitesi (ECU) kullanilarak enjekte edildigi cift yakitli motor modunda calismak donusturulur ve CNG atesleme kaynagi haline edildi . Deneysel arastirmalar tek silindirli su uzerinde yapilmistir sogutmali cift yakitli CI motor test kulesi Diesel, Honge metil esteri (HOME) kullanilarak isletilen dort zamanli, Jatropha metil ester (Jome) ve enjekte Pilot yakit ve CNG olarak% 15 etanol ile bunlarin karisimlari enjekte gibi Birincil yakit. ECU dizel / biyodizel icin uygun enjeksiyon zamanlamasi 27 ° BTDC C'da tutulurken CNG enjeksiyonu enjeksiyon zamanlamasini ve enjeksiyon degisik surelerle kullanilmistir. Kilavuz yakit enjeksiyon basinci 230 bar muhafaza edilmistir. Motor / saat 0.5 kg muhafaza edilmistir 17,5 ve CNG akis orani sabit bir sikistirma orani ile calistirildi. Deney sonuclari 5obTDC ve CNG enjeksiyon icin 60 ° CA enjeksiyon suresinin bir enjeksiyon zamanlamasi gelismis performans, yanma ve emisyon ozelliklerine gore uygun oldugu bulunmustur gosterdi. Manifoldu fren isil verim CNG- dizel / biyodizel-etanol% 27.1,% 26.2 ve dizel etanol karisimi icin% 25.2 olarak bulunmustur% 80 yukte cift yakit operasyonu karisimli enjekte, EV-etanol karisimidir ve Jome-etanol karisimlari sirasiyla . Karbon emisyon ve duman emisyonlari CNG CNG ile karsilastirildiginda cift yakit operasyonu cift yakit operasyonu muzeye enjekte icinde daha az oldugu tespit edildi.

international journal of automotive engineering and technologies :

Effect of CNG manifold Injection on the Performance, Combustion and Emission characteristics of a CNG -Biodiesel Dual Fuel Operation/Bir manifolda enjekte edilen CNG-Biyodizel Çift Yakıt Çalışmasının Perf.,Yanma ve Emisyon Karakteristikleri Üzerine Etkisi