An Experimental Study on the Macroscopic Spray Characteristics of Biodiesel and Diesel in a Constant Volume Chamber

Abstract

Abstract:The objective of this study was to investigate the macroscopic spray characteristics of different 0%-100% blends of biodiesel derived from drainage oil and diesel (BD0, BD20, BD50, BD80, BD100), such as spray tip penetration, average tip velocity at penetration, spray angle, average spray angle, spray evolution process, spray area and spray volume under different injection pressures (60, 70, 80, 90, 100 MPa) and ambient pressures (0.1, 0.3, 0.5, 0.7, 0.9 MPa) using a common rail system equipped with a constant volume chamber. The characteristic data was extracted from spray images grabbed by a high speed visualization system. The results showed that the ambient pressure and injection pressure had significant effects on the spray characteristics. As the ambient pressure increased, the spray angle increased, while the spray tip penetration and the peak of average tip velocity decreased. As the injection pressure increased, the spray tip penetration, spray angle, spray area and spray volume increased. The increasing blend ratio of biodiesel brought about a shorter spray tip penetration and a smaller spray angle compared with those of diesel. This is due to the comparatively higher viscosity and surface tension of biodiesel, which enhanced the friction effect between fuel and the injector nozzle surface and inhibited the breakup of the liquid jet.

Performance Evaluation of Palm Oil-Based Biodiesel Combustion in an Oil Burner

“…Biodiesels are recognized as a viable substitutes for diesel fuel which can be produced with similar functional properties as fossil fuels from local feedstocks. A variety of feedstocks can be employed for biodiesel production like rapeseed, soybean, palm oil and jatropha [2]. Palm oil, as one of the main agricultural products in Malaysia, is mostly applied for biodiesel production in that region.…”

Experimental study of the effect of n-butanol additive on spray characteristics of biodiesel in a high-pressure common-rail injection system

“…As high ambient pressure means high ambient gas density, the larger resistance to spray caused by higher gas density hinders the spray development at the axial direction while forcing the spray to expand at the radial direction, and eventually leads to an increase in angle. 25 It is noticeable that for B20, the angle difference between two ambient pressures is small under 70 MPa. When the injection pressure increases the difference becomes obvious.…”

Combustion and Emission Characteristics of Coconut-Based Biodiesel in a Liquid Fuel Burner

“…High concentrations of CO in the atmosphere cause harmful effects to human health by reducing the oxygen levels in the blood vessel delivered to body organs and tissues [5]. Biodiesel is a mono alkyl ester of long fatty acids derived from renewable lipid feed stocks, such as vegetable oil and animal fats, for use in compression ignition diesel engines [6,7]. Biodiesel is produced by a chemical process called transesterification, i.e., a reaction between triglycerides and alcohol to produce methyl ester and glycerol.…”