In this study, the effects of adding ethanol and diethyl ether to diesel fuel on combustion characteristics and NO emissions were numerically investigated. 100% diesel fuel (D100) and by volume 90% diesel+10% ethanol blend (D90E10), 80% diesel+20% ethanol blend (D80E20), 80% diesel+10% ethanol+10% diethyl ether blend (D80E10DEE10) and 85% diesel+ 10% ethanol+5% diethyl ether mixture (D85E10DEE5) was used as fuel. Analyzes were carried out using a single cylinder direct injection diesel engine at 2000 and 3000 rpm engine speed conditions. AVL FIRE software was used for numerical study. In-cylinder pressure, cumulative heat release rate, turbulent kinetic energy (TKE), NO emissions and velocity distributions in the combustion chamber were investigated for five different fuel types. As a result, the in-cylinder pressure and heat release rate of ethanol and diethyl ether blended fuels were lower than diesel fuel at both speeds. This is due to the calorific value of the fuel. It was observed that NO emissions decreased as the ethanol content in the fuel increased. For both engine speeds, the highest TKE value was obtained in D90E10 mixed fuel, and the lowest value was found in D80E10DEE10 mixture fuel. Ethanol positively affected the turbulent kinetic energy. The flow rate of ethanol was higher than diesel and diethyl ether fuel.
In this study, the long-term endurance tests were carried out in a diesel engine that used diesel and 90% diesel + 10% bioethanol fuels. The spray and temperature distributions of two different fuels in the AVL FIRE program also were examined. Tribological and morphological analysis of piston rings were investigated in a single-cylinder direct injection diesel engine using two different fuel types. The test engine used two different fuel types and was operated for approximately 110 hours under part engine load. Renewed rings in each fuelled engine operation were analyzed at Energy Dispersive X-ray Spectroscopy (EDX) and Scanning Electron Microscope (SEM). Results were also compared with the non-worked piston ring. Analysis results saw that abrasive wear was more intense on the first rings at both fuel types. Examining the effect of biofuels on engine wears, short wear lines were found at engine rings using diesel/bioethanol blend fuel compared to diesel fuel. It was being determined that this situation was a result of combustion parameters (such as pressure, and temperature) created with the different fuels used in diesel engines. As a result, that bioethanol has a content of low carbon (C) compared to diesel fuel, making a positive contribution to the reduction of ring wear.
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