Abstract
The paper presents results of experimental investigation of cocombustion process of biodiesel (B100) blended with oxygenated fuels with 20% in volume. As the alternative fuels ware used hydrated ethanol, methanol, 1-butanol and 2-propanol. It was investigated the influence of used blends on operating parameters of the test engine and exhaust emission (NO x , CO, THC, CO 2 ). It is observed that used blends are characterized by different impact on engine output power and its efficiency. Using biodiesel/alcohol blend it is possible to improve engine efficiency with small drop in indicated mean effective pressure (IMEP). Due to combustion characteristic of biodiesel/alcohol obtained a slightly larger specific NO x emission. It was also observed some differences in combustion phases due to various values of latent heat of evaporation of used alcohols and various oxygen contents. Test results confirmed that the combustion process occurring in the diesel engine powered by blend takes place in a shorter time than in the typical diesel engine.
Highlights
Co-combustion of fuel blends is one of the methods to utilize alternative fuels in internal combustion engines
The results indicated that by using methanol-blended diesel fuels, smoke opacity, CO and total hydrocarbons (THC) emissions reduced while CO2 and nitrogen oxides (NOx) emissions increased
In case of combustion phases the lowest value of ignition delay (ID) obtained for the engine powered by B100 and it was 15 deg of CA, the highest value of ID reached for powering by BM20 and it was equal 18 deg of CA
Summary
Co-combustion of fuel blends is one of the methods to utilize alternative fuels in internal combustion engines. In paper [16] authors presented results of experimental investigation of co-combustion of hydrated ethanol blend with diesel fuel in direct injection diesel engine. They stated that with increase in ethanol fraction in blend increased the ignition delay and decreased combustion duration as well. Author of paper [21] presented results of experimentally investigation of the performance, combustion characteristics, NO emissions, and stability of a diesel engine fuelled by diesel – biodiesel – butanol blend. They stated that the addition of butanol with a percentage of up to 20% to the biodiesel – diesel fuel blend resulted in a tolerable change in the engine performance, combustion characteristics, NO emission, and engine stability compared to the diesel fuel, which indicates that the butanol has a great potential to be used as a fuel additive in the diesel engines [21]
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