Effect of double injection on combustion, performance and emissions of Jatropha water emulsion fueled direct-injection diesel engine

Abstract

a b s t r a c tThe experimental study was carried out using a four-stroke, high speed, DI (direct-injection) diesel engine with double fuel injections. In this study, Jatropha water emulsion was made by mixing a mass ratio of 10% of water. While fixing the first injection timing, we tested the engine on JWE (Jatropha water emulsion) with various injection timings and quantities of second injections. The acquired data was analyzed for various combustion parameters such as heat release rate, combustion center (timing of 50% of total heat release), ignition delay, and combustion duration; for performance parameters such as incylinder temperature, exhaust gas temperature, brake thermal efficiency; and emissions of CO (carbon monoxide), CO 2 (carbon dioxide), HC (hydrocarbons), NOx (nitrogen oxides), as well as dust and smoke opacity. When using a large second injection amount, we found a significant reduction in the peaks of the in-cylinder pressure, HRR (heat release rate), and average in-cylinder temperatures. We also found a drastic increase in the ignition delay, combustion duration, and a shift in the combustion center toward the later combustion stage, as well as increased exhaust gas temperatures, and reduced brake thermal efficiency compared with those of the Light oil. A large second injection amount reduced NOx emissions up to 48%, and drastically reduced HC emissions at higher loads of the engine.

Study of the performance and emission characteristics for a dual fuel powered single cylinder diesel engine

“…It needs very low sprinkling and grows in all kinds of soils (hill slopes, coastline areas). The yield of Jatropha seeds is about 0.8 kg per square meter per year [33]. Jatropha seeds contain oil ranges at 30 to 40 % by weight and the kernel itself is ranged from 45% to 60% [34].…”

“…The dual fuel blend gives lower BSFC at higher load. This is because of better combustion of fuel at the higher engine load [33]. The BSFC was compared with the standard diesel at different loading conditions for the dual fuel blend BT50 as shown in Figure 5(a) at no to full load and the BT50 fuel consumption is marginally higher than the standard diesel fuel.…”

Combustion features under different center of heat release of a diesel engine using dimethyl carbonate/diesel blend

“…The bulk gas temperature, which is calculated out according to the state equation of ideal gas (Nguyen et al, 2015), for three fuel injection modes are shown in Figure 6. With retarding of COHR, the bulk gas temperature in cylinder is gradually decreased.…”

Two-term power models for estimating kinematic viscosities of different biodiesel-diesel fuel blends

“…However, their fluctuating prices and rapid declining known reserves, and environmental concerns about air pollution [2,3] have focused searches on alternative fuels. Among the alternatives, biodiesel is gaining worldwide attention and considered to be one of the most practical energy sources for diesel engines which have been used widely in the transportation, construction work and power generation due to their high thermal efficiency and durability [1,4].…”