Evaluation of Fuel Injection Strategies for Biodiesel Fueled CRDI Engine Development and Particulate Studies

[+] Author and Article Information
Akhilendra P. Singh

Engine Research Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India

Avinash Kumar Agarwal

Engine Research Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India

1Corresponding author.

ASME doi:10.1115/1.4039745 History: Received January 12, 2018; Revised March 15, 2018


In this study, a state-of-the-art single cylinder research engine was used to investigate the effects of fuel injection parameters on combustion, performance, emission characteristics, and particulates and their morphology. The experiments were carried out at three FIPs (400, 700 and 1000 bar) and four SoMI timings (4°, 6°, 8° and 10° bTDC) for biodiesel blends [B20 (20% v/v biodiesel blend) and B40 (40% v/v biodiesel blend)] compared to baseline biodiesel at a constant engine speed (1500 rpm), without pilot injection and exhaust gas recirculation (EGR). The experimental results showed that FIP and SoMI timings affected the in-cylinder pressure and the heat release rate (HRR), significantly. At higher FIPs, the biodiesel blends resulted in slightly higher rate of pressure rise (RoPR) and combustion noise compared to baseline mineral diesel. All the test fuels showed relatively shorter combustion duration at higher FIPs and advanced SoMI timings. The biodiesel blends showed slightly higher NOx and smoke opacity compared to baseline mineral diesel. Lower particulate number concentration at higher FIPs was observed for all the test fuels. However, the biodiesel blends showed relatively higher particulate numbers compared to baseline mineral diesel. Significantly lower trace metals in the particulates emitted from biodiesel blend fueled engine was an important finding of this study. The particulate morphology showed relatively smaller number of primary particles in particulate clusters from biodiesel exhaust, which resulted in relatively lower toxicity, thus rendering biodiesel more environmentally benign.

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