| 제목 |
Experimental Study of the Ignition Characteristic of Gasoline–Biodiesel Blended Fuel in a Constant-Volume Chamber |
| 분야 |
연료 및 윤활유/연비 |
| 언어 |
English |
| 저자 |
부딘남(울산대학교), 임옥택(울산대학교), 김재광(모토닉), 전완재(모토닉), 이호길(자동차부품연구원) |
| Key Words |
ignition delay, lift-off length, gasoline biodiesel blend, luminous soot emission, low-temperature combustion |
| 초록 |
A detailed experimental study of ignition and flame lift-off length was conducted for gasoline biodiesel fuel (GB) blends using an optically accessible constant volume combustion chamber (CVCC). Experiments were performed using 20%, 40%, 60% and 80% blend ratios by volume where both the fuels possess distinct fuel properties. The fuel blends were injected into the CVCC to combust under elevated high pressure-temperature conditions using a single-hole research grade injector. Natural soot luminous images from the combustible flame were captured by a CMOS camera to determine the ignition delay time and the flame lift-off length. The ignition delay was also analyzed separately through pressure traces measured using a high-frequency piezoelectric pressure transducer. The experimental observations showed that a higher gasoline content produced a significantly longer ignition delay, thus improving and extending the evaporation process. The difference between the pressure-based and luminosity-based ignition delay is somewhat dependent on the mixing process and time period of ignition delay. As the ignition delay is prolonged or the mixing is enhanced, the difference between them decreases and vice versa. This experimental data supports cold-start and low load engine operating condition by taking the advantage of gasoline such as high volatility and long ignition delay which potentially help the mixing process. As a consequence, the biodiesel content should be less than 20 %. Different gasoline biodiesel (GB) content ratios have a notable impact on the lift-off length. In general, lift-off length increases with an increase in biodiesel. However, for 750 K the decrease in lift-off length is due to a significantly reduced ignition delay (less than 60 % biodiesel). |
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