Yazar "Uyumaz, Ahmet" için listeleme
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Bir dizel motorunun bilgisayar yardımı ile termodinamik ve performans analizi
Polat, Seyfi; Solmaz, Hamit; Yücesu, Hüseyin Serdar; Uyumaz, Ahmet (Gazi Üniversitesi, 2013)Bu çalışmada, dört zamanlı, tek silindirli, normal emişli, direkt püskürtmeli bir dizel motorunun çevrim analizi için MATLAB programında bir simülasyon geliştirilmiştir. Simülasyon sonucunda; tam yükte krank mili açısına ... -
Combustion and performance characteristics of an HCCI engine utilizing trapped residual gas via reduced valve lift
Çınar, Can; Uyumaz, Ahmet; Polat, Seyfi; Yılmaz, Emre; Can, Özer; Solmaz, Hamit (Elsevier Ltd, 2016)In this study, the effects of residual gas fraction (RGF) on homogeneous charged compression ignition (HCCI) combustion were investigated experimentally. Experiments were performed at different lambda values and constant ... -
Doğalgaz yakıtlı HCCI bir motorda hidrojen ilavesinin yanma karakteristikleri üzerindeki etkilerinin nümerik olarak incelenmesi
Polat, Seyfi; Uyumaz, Ahmet; İpci, Duygu; Yücesu, Hüseyin Serdar; Solmaz, Hamit; Yılmaz, Emre (BİLEŞİM Yayıncılık, 2015)Homojen dolgulu sıkıştırma ile ateşlemeli motorlar konvansiyonel içten yanmalı motorlarla karşılaştırıldığında yüksek termik verim, NOx ve is emisyonlarındaki eş zamanlı azalma avantajlarından dolayı yeni bir araştırma ... -
Effects of intake air temperature on combustion, performance and emission characteristics of a HCCI engine fueled with the blends of 20% n-heptane and 80% isooctane fuels
Cinar, Can; Uyumaz, Ahmet; Solmaz, Hamit; Sahin, Fatih; Polat, Seyfi; Yilmaz, Emre (Elsevier, 2015)In this study, the effects of intake air temperature on the cylinder pressure, heat release rate, start of combustion, combustion duration, engine performance and exhaust emissions were investigated in a HCCI gasoline ... -
The Effects of iso-propanol and n-heptane Fuel Blends on HCCI combustion characteristics and engine performance
In this study, the effects of iso-propanol fuel blends were investigated on HCCI combustion and engine performance. The variations of cylinder pressure, heat release rate, start of combustion and engine performance were ... -
Experimental examination of the effects of military aviation fuel JP-8 and biodiesel fuel blends on the engine performance, exhaust emissions and combustion in a direct injection engine
Uyumaz, Ahmet; Solmaz, Hamit; Yilmaz, Emre; Yamik, Hasan; Polat, Seyfi (Elsevier Science Bv, 2014)Biodiesels are the most popular fuels which can be used as an alternative fuel instead of diesel fuel in diesel engines. Low emission characteristics and high cetane numbers are the most significant advantages of biodiesels. ... -
An experimental investigation on combustion and performance characteristics of supercharged HCCI operation in low compression ratio engine setting
Polat, Seyfi; Yucesu, H. Serdar; Uyumaz, Ahmet; Kannan, Kaushik; Shahbakhti, Mahdi (Pergamon-Elsevier Science Ltd, 2020)This study investigates the effects of boost pressure on combustion and performance of an early direct injection homogenous charge compression ignition (HCCI) engine at a low compression ratio (CR). A 2.0 L, four-cylinder, ... -
An Experimental Research on the Effects of Negative Valve Overlap on Performance and Operating Range in a Homogeneous Charge Compression Ignition Engine With RON40 and RON60 Fuels
Polat, Seyfi; Solmaz, Hamit; Uyumaz, Ahmet; Calam, Alper; Yilmaz, Emre; Yucesu, H. Serdar (Asme, 2020)In this study, the effects of negative valve overlap (NVO) on homogenous charge compression ignition (HCCI) combustion and engine performance were experimentally investigated. A four stroke, single cylinder, port injection ... -
An experimental study on the effects of diesel and jet-A1 fuel blends on combustion, engine performance and exhaust emissions in a direct injection diesel engine
Solmaz, Hamit; Yamık, Hasan; Uyumaz, Ahmet; Polat, Seyfi; Yılmaz, Emre (Turkish Society for Thermal Science and Technology, 2016)In this study, an experimental investigation was performed in order to determine the effects of Jet-A1(A100), diesel fuel and Jet-A1/diesel fuel blends (A25, A50, A75) including 25% Jet-A1/75% diesel, 50% Jet-A1/50% diesel ... -
Investigation of usability of the fusel oil in a single cylinder spark ignition engine
Calam, Alper; Solmaz, Hamit; Uyumaz, Ahmet; Polat, Seyfi; Yılmaz, Emre; Içingür, Yakup (Elsevier B.V., 2015)In order to decrease the dependency on petrol-originated energy resources, the utilization of different energy resources in internal combustion engines has been the center of interest of researchers. The main renewable ... -
Mapping of an HCCI engine using negative valve overlap strategy
Polat, Seyfi; Solmaz, Hamit; Yılmaz, Emre; Calam, Alper; Uyumaz, Ahmet; Yücesu, Hüseyin Serdar (Taylor and Francis Inc., 2020)In order to control combustion phasing and extend operation range of homogeneous charged compression ignition (HCCI) engines, several techniques such as controlling inlet air temperature and pressure, using alternative ... -
A numerical study on the effects of EGR and spark timing to combustion characteristics and NOx emission of a GDI engine
Polat, Seyfi; Uyumaz, Ahmet; Solmaz, Hamit; Yılmaz, Emre; Topgül, Tolga; Yücesu, Hüseyin Serdar (Taylor and Francis Inc., 2016)EGR is one of the most significant strategies for reducing especially nitrogen oxides (NOx) emissions from internal combustion engines. The thermal efficiency of spark ignition engines is lower than compression ignition ... -
Reaktif kontrollü sıkıştırma ile ateşlemeli (RCCI) bir motorda lamdanın yanma karakteristiklerine etkileri
Uyumaz, Ahmet; Solmaz, Hamit; Boz, Fahrettin; Yılmaz, Emre; Polat, Seyfi (Afyon Kocatepe Üniversitesi, 2017)Bu çalışmada reaktif kontrollü sıkıştırma ile ateşlemeli (RCCI) bir motorda lamdanın (?) yanma karakteristikleri üzerindeki etkileri deneysel olarak incelenmiştir. Dört zamanlı, dört silindirli benzinli bir motor tam yük ...
