Investigation of Combustion Process of Biodiesel Derived from Waste Cooking Oil, Jatropha, Palm Oil and Algae using Rapid Compression Machine

Abstract

Biodiesel essentially comes from plants and animal fats which is safe and can be used in diesel engines with few or no modification needed toward existing engine. Higher of the biodiesel blending ratio reflects to the higher viscosities that influences to the fuel-air premixing, ignition process and combustion characteristics. The objective of this research is to investigate the effect of different blending ratio on ignition delay, ignition process, combustion characteristics and emission production using Rapid Compression Machine (RCM). Rapid Compression Machine is used to simulate combustion behaviour similar with the real combustion for internal combustion engines. The standard petroleum diesel was blend with biodiesel derived from waste cooking oil, algae and jatropha with blending ratio from 2vol% to 40vol%. The biodiesel were tested using 130 MPa of injection pressure with constant ambient temperature of 950 K. Increased of the blending ratio of biodiesel significantly influences the longer of ignition delay. Changes of biodiesel properties thus influence to the fuel-air mixing, ignition process and combustion characteristics. In addition, the emission of NOx and CO2 increased when increasing biodiesel blending ratio.