Effect of ethanol addition on the performance and exhaust emissions of a spark ignition engine

Abstract

The depletion of fossil fuel availability and increase of pollution due to the use of fossil fuels have forced the researcher to find a renewable-friendly energy source. One of the potential replacements is alcohol based fuel. This present study investigated experimentally the influence of ethanol addition on the engine performance, in terms of effective power, brake specific fuel consumption, and exhaust emissions of a gasoline spark ignition engine. The engine used in the research was a 4-stroke single cylinder, indirect injection system with engine capacity of 124.8cc, and compression ratio of 9.3:1. The experiments were conducted at eight different engine speeds ranging from 1500 rpm to 5000 rpm and 10 types of gasoline-ethanol mixtures (E10 to E100). The result showed that the effective power decreased with the increase of ethanol in the fuel blends for all variations of engine speed. Leaning effect of ethanol addition in the blend fuel caused the CO emissions to decrease greatly as well as the HC emissions. On average, gasoline engine fueled by pure ethanol reduced the CO emission level by more than 60 % in volume compared to the engine with gasoline fuel. On average, the maximum power of the engine with fuel blend was obtained at engine speed of around 2500 to 3000 rpm. For higher ethanol content on the fuel blend, the optimum shift to the lower engine speed. It can be concluded that engine operation with ethanol content on the fuel performed better in the lower engine speed.

Analysis of hydrogen enriched treble biofuel blended with diesel for performance, emission and combustion characteristics on CI engine

“…HC emission reduced with increased IOP of engine for base line fuel, biodiesel blended diesel mixture and biodiesel blended diesel mixture with hydrogen. HC emission increased for all test fuels with load, and there was a reduction in HC emission for biodiesel compared to diesel due to the presence of oxygen in its molecular structure that led to an efficient combustion [29,31]. The decreasing trend of UHC was observed with increasing %age of H2 substitution when compared with pure diesel because of its high flammability limit and calorific value [32].…”

“…Features like higher cetane number than diesel and less sulphur and more oxygen, are environmentally friendly and can reduce HC and CO in the exhaust gas. For these reasons, different studies have been conducted on biodiesel blended with diesel and the results show that emission concentration varies and depends on biodiesel source and engine condition [14,20,29]. Hydrogen possesses many superior combustion and emission characteristics than other liquid or gas fuels.…”

A Review on Performance and Emissions of Compression Ignition Engine Fueled with Ethanol-diesel Blend

“…Blend stability mainly depends on two factors, temperature and water content of the blend. If the temperature falls below 10 ℃, then these two fuels separate [31]. Sources: [29,[32][33][34][35] It can be observed from Figure 3 that a huge difference between petroleum oil consumption and production in India and it is increasing year by year.…”

Computational performance of a-100 kW low pressure turbine to recover gas turbine exhaust energy

“…The fossil fuel is refined from the petroleum crude oil that is depleted with continuous usage [2]. Alternative renewable liquid fuels such as biofuels are proposed by many researchers to replace the fossil fuels [3]. Despite the high demand for fuels in the transportation, well-to-wheel energy efficiency is approximately 14% only [4].…”