Abstract
The paper presents result of combustion stability assessment of dual fuel engine. The authors analyzed results of co-combustion of diesel fuel with alcohol in terms of combustion stability. The comparative analysis of both the operational parameters of the engine and the IMEP, as the parameters determining the stability of the combustion process, were carried out. It was analyzed, among others values of the COVIMEP coefficient, the spread of the maximum pressure value, the angle of the position of maximum pressure and the probability density distribution of the IMEP. The experimental investigation was conducted on 1-cylinder air cooled compression ignition engine. The test engine operated with constant rpm equal to 1500 rpm and constant angle of start of diesel fuel injection. The engine was operat-ed with ethanol up to 50% of its energy fraction. The influence of ethanol on ignition delay time spread and end of combustion process was evaluated. It turns out that the share of ethanol does not adversely affect the stability of ignition..
Highlights
Diesel engines are widely used to power engineering devices for its good durability, thermal efficiency and specific power output
Most of investigations showed that using alcohols in diesel engines can reduce emission of hydrocarbon (HC), carbon monoxide (CO) and particulate matter (PM) emissions, but nitrogen oxide (NOx) emission increases [4,5,6]
The results showed that the lower intake temperature could be used for achieving better combustion stability at low load condition along with the retarded CA50, the lower maximum in-cylinder pressure, and the higher indicated mean effective pressure (IMEP). 70°C was the lower limit of intake temperature to achieve stable PPC operation with the single-injection strategy
Summary
Diesel engines are widely used to power engineering devices for its good durability, thermal efficiency and specific power output. These engines are major contributors of air pollutant emission such as carbon monoxide (CO) and nitrogen oxides (NOx) [1, 2]. Most of investigations showed that using alcohols in diesel engines can reduce emission of hydrocarbon (HC), carbon monoxide (CO) and particulate matter (PM) emissions, but nitrogen oxide (NOx) emission increases [4,5,6]. The oxygen content of alcohols structure is an important factor in the NOx formation, because it causes to high local temperatures due to excess hydrocarbon oxidation. The increased oxygen levels increase the maximum temperature during the combustion, and increase NOx formation [7,8,9,10]
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