Comparison of Injection Characteristics and Droplet Distribution on Crude Palm Oil and Diesel Using CFD

Abstract

<p>CPO (Crude Palm Oil) is a potential renewable<br />fuel as a substitute for fossil fuels used in internal combustion<br />engines. An important parameter that affects the combustion of<br />an engine with an injection system is the characteristics of the<br />fuel spray. This research was conducted using Computational<br />Fluid Dynamics (CFD) software to model the atomization<br />process that occurs when CPO and diesel fuel are injected with<br />a pressurized atomizer. The modeling shows the characteristics<br />of the spray which include the shape of the spray and the droplet<br />diameter distribution. These characteristics are presented with<br />spray images, droplet diameter distribution graphs, and velocity<br />distribution graphs. Simulations show that at temperatures<br />above 75°C and 100°C, CPO spray produces droplet shapes and<br />distributions that are almost the same as diesel spray. On the<br />other hand, diesel injection spray produces a lower droplet size.<br />The highest droplet size distribution is at 12-16 microns.</p>