Abstract
In this study, the performance and emission of a thermal barrier coating (TBC) engine which applied palm oil biodiesel and diesel as a fuel were evaluated. TBC was prepared by using a series of mixture consisting different blend ratio of yttria stabilized zirconia (Y2O3·ZrO2) and aluminum oxide-silicon oxide (Al2O3·SiO2) via plasma spray coating technique. The experimental results showed that mixture of TBC with 60% Y2O3·ZrO2 + 40% Al2O3·SiO2 had an excellent nitrogen oxide (NO), carbon monoxide (CO), carbon dioxide (CO2), and unburned hydrocarbon (HC) reductions compared to other blend-coated pistons. The finding also indicated that coating mixture 50% Y2O3·ZrO2 + 50% Al2O3·SiO2 had the highest brake thermal efficiency (BTE) and lowest of brake specific fuel consumption (BSFC) compared to all mixture coating. Reductions of HC and CO emissions were also recorded for 60% Y2O3·ZrO2 + 40% Al2O3·SiO2 and 50% Y2O3·ZrO2 + 50% Al2O3·SiO2 coatings. These encouraging findings had further proven the significance of TBC in enhancing the engine performance and emission reductions operated with different types of fuel.
Highlights
Exploration on the energy-efficient engine has always driven engineers as the total consumptions of petroleum-based fuel such as diesel was increased proportionally with the demands from the power generation, industrial and transportation areas [1]
Application of biodiesel in unmodified the internal combustion diesel engine significantly declined the performance of the engine and its combustion characteristics, which might be caused by the physicochemical properties of the biodiesel [6,7]
The effects of thermal barrier coating (TBC) with various blend ratios of Y2 O3 ·ZrO2 and Al2 O3 ·SiO2 on the emission control and engine performance using conventional diesel and biodiesel are further discussed
Summary
Exploration on the energy-efficient engine has always driven engineers as the total consumptions of petroleum-based fuel such as diesel was increased proportionally with the demands from the power generation, industrial and transportation areas [1]. Introduction of TBC into the engine design is necessary to overcome efficiency problems as this coating technology was proven significantly to increase power and decrease specific fuel consumption [2]. Biodiesel, which is non-toxic and a renewable energy resource was introduced as an alternative solution for diesel [4]. This environmentally friendly energy resource results in less emission of greenhouse gases, unburned HC and polycyclic aromatic compounds [5]. Various aspects of engine modification have been explored in order to overcome this drawback and the TBC seems a positive solution [8,9]
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