Influence of injection timing on performance, emission, and combustion characteristics of CI engine working with ternary blended biodiesel

Abstract

The performance, emission, and combustion characteristics of JKC biodiesel in CI engines at different injection timing are investigated in this study. The tests were carried out with four dissimilar biodiesel compositions containing 5, 6.66, 8.33, and 10% JKC biodiesel, respectively. The JKC biodiesel with 6.66% Jatropha-Karanja-Cottonseed (JKC6.66D80) has been determined to be the optimum composition depending on the efficiency of brake thermal and underneath emissions. At 25° before top dead center (BTDC) injection timing, maximum brake thermal efficiency (BTE) of 28.2 percent and the lowest BSFC (brake specific fuel consumption) of 0.3 kg/KWhr were attained, corresponding to the blended JKC6.66D80 fuel. The emissions of hydrocarbon and carbon monoxide are inferior for JKC6.66D80 fuel with 28 ppm and 0.18% at 25° BTDC injection timing. The cylinder pressure reached 76.99 bar for injection 25° BTDC, with a rate of pressure rise 9.05 bar/crank angle.The cumulative heat release rate and heat release rate are extreme for JKC6.66D80 blended fuel at 25° BTDC. At 25° BTDC injection for JKC6.66D80 blended fuel, the performance, emission, and combustion characteristics are improved than 23° BTDC standard diesel injection timing. As a result, JKC6.66D80 fuel can replace diesel substitutes in CI engines with a minor advance in injection timing.