Influence of Combustion Duration on the Performance and Emission Characteristics of a Spark-Ignition Engine Fueled with Pure Methanol and Ethanol

Abstract

In this research, we estimated and summarized the effects of combustion duration on the performance and emission characteristics of a spark-ignition engine using pure methanol and ethanol as fuels, which have not been previously presented. From the results, we demonstrated that an increase in combustion duration causes a decrease in peak firing temperature and peak firing pressure and an increase in trapped residual gas. The level of trapped residual gas when using ethanol as fuel is higher than that of methanol fuel. The indicated mean effective pressure (IMEP) and brake mean effective pressure (BMEP) increase to maximum values and then decrease with increasing combustion duration, while the brake specific fuel consumption (BSFC) reaches a minimum value and then increases. The optimal BSFC improved to 33.31% when the engine used ethanol fuel instead of methanol. The increase in combustion duration helps to reduce NO x and HC emissions, but an increase in CO emissions is observed.

Experimental study on the effect of load and air+gas/fuel ratio on the performances, emissions and combustion characteristics of diesel–LPG fuelled single stationary ci engine

“…In addition, the flame temperature is low at lean and rich mixtures 29 . The result obtained in this work collaborates with those obtained in previous works 28,29 . In addition, the observation made on the variation of combustion duration as a function of LPG/diesel fuel ratio strengthen the results obtained during this work on the peak of in cylinder pressure, emitted smoke, engine performance and NOx.…”

“…29 The result obtained in this work collaborates with those obtained in previous works. 28,29 In addition, the observation made on the variation of combustion duration as a function of LPG/diesel fuel ratio strengthen the results obtained during this work on the peak of in cylinder pressure, emitted smoke, engine performance and NOx. In fact, the peak of in cylinder pressure increases with a decrease in the combustion duration.…”

“…It is then normal to see NO x increase with an increase in the load because of an increase in combustion duration. But contrarily to other works where NO x increase with an increase in the ratio, [27][28][29][30] in this work NO x decrease with an increase in the ratio (increase in the peak of in cylinder temperature due to the increase in the combustion duration). This can be justified by the type of fuel used as well its composition.…”

“…Combustion duration is defined as the period from 10% to 90% of mixture combust up, which is mainly a turbulent combustion and greatly be accelerated by turbulence in cylinder. Many works [27][28][29][30] showed that combustion duration has a big impact on combustion characteristics, pollutants as well as engine performance. In this study, effect of LPG/diesel fuel ratio on combustion duration were investigated.…”

Ammonia Combustion in a Spark-Ignition Engine Supported with Dimethyl Ether

“…The CA50 value, according to the optimization assumptions of the engine cycle, should be 10 deg aTDC. Shortening the duration of combustion in the engine results in an increase in its efficiency (ITE) and the value of the average indicated pressure and, at the same time, a decrease in specific fuel consumption [29,30]. The combustion time affects the use of the energy contained in the fuel, increasing the combustion efficiency, which will also affect the exhaust gas temperature and then the exhaust emissions [31].…”