PERFORMANCE, EXHAUST EMISSIONS AND COMBUSTION CHARACTERISTICS OF MOHR OIL BASED BIODIESEL IN A MEDIUM GRADE LOW HEAT REJECTION DIESEL ENGINE

Yıl 2013, Cilt: 2 Sayı: 2, 70 - 84, 27.04.2013

T. Reddy M.v.s. Krishna Ch. Reddy Venkata Murthy , P.V:K. Murthy

Öz

Experiments were carried out to evaluate the performance of a mohr oil based biodiesel (MOBD) at different operating conditions [normal temperature and pre-heated temperature] in a medium grade low heat rejection (LHR) diesel engine with air gap insulated piston with superni (an alloy of nickel) crown and air gap insulated liner with superni insert with varied injection pressure and injection timing. Performance parameters and exhaust emissions of smoke and oxides of nitrogen (NOx) were determined at different values of brake mean effective pressure (BMEP). Combustion characteristics were recorded at peak load operation of the engine. Combustion parameters were measured with TDC (top dead centre) encoder, pressure transducer, console and special pressure-crank angle software package. Conventional engine (CE) showed compatible performance with biodiesel operation, while LHR engine showed improved performance at recommended injection timing of 27obTDC (before top dead centre) and recommended injection pressure of 190 bar. The performance of both version of the engine improved with advanced injection timing and at higher injection pressure when compared with CE with pure diesel operation. The optimum injection timing was 31obTDC for CE while it was 30obTDC with LHR engine with biodiesel operation. Peak brake thermal efficiency increased by 12.5%, smoke levels decreased by 38% and NOx levels increased by 35% with biodiesel operation on LHR engine at its optimum injection timing, when compared with pure diesel operation on CE at 27obTDC. 

Anahtar Kelimeler

Mohr oil, Esterification, LHR engine, Performance, Emissions, Combustion characteristics / mohr yağı, esterleşme, LHR motor, performans, salınım, yanma karekteristikleri

PERFORMANCE, EXHAUST EMISSIONS AND COMBUSTION CHARACTERISTICS OF MOHR OIL BASED BIODIESEL IN A MEDIUM GRADE LOW HEAT REJECTION DIESEL ENGINE

Öz

Deneyler hava boşluğu yalıtımlı nikel alaşımlı pistonlu orta düzey düşük ısı atıklı dizel motor ve hava boşluklu supreni girişi ile yalıtılmış çeşitli basınç ve enjeksiyon zamanlamada farklı operasyon durumlarında biyodizel esaslı mohr yağının performansını değerlendirmek için yapıldı. Performans parametreleri ve azot oksitler ve dumanın egzoz salınımları etkin fren anlamına gelen frenin farklı değerlerinde tanımlandı. Yanma karekteristikleri motorun en üst düzey yükleme operasyonunda kaydedildi. Yanma parametreleri üst ölü nokta çevirici, basınç çevirici, konsol ve özel basınç krank açı yazılım paketi ile hesaplandı. LHR motor 27 obTDH(üst ölü nokta merkezinden önce) tavsiye edilen enjeksiyon zamanında ve 190 bar tavsiye edilen enjeksiyon basıncında gelişmiş bir performans gösterirken geleneksel motor biyodizel operasyonda rekabetçi bir performans gösterdi. Motorun her iki versiyonunun performansı da saf dizel operasyonu CE ile kıyaslandığı zaman gelişmiş enjeksiyon zamanu-I ve yüksek enjeksiyon basıncı ile geliştirildi. Biyogaz operasyonunda LHR motorda optimum enjeksiyon zamanı 30 obTDC iken CE motorda 31ob TDC dir. En üst ısıl fren etkinliği 27obTDC değerinde bir zamanla saf dizel operasyon ile kıyaslandığında optimum enjeksiyon zamanında LHR motor üzerinde biyodizel operasyonu ile %12.5 civarında arttı duman seviyesi %38 civarında azaldı ve azot oksit seviyesi %35 oranında arttı.

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