Investigation of parameters of mixing and heat formation of diesel engines in the process of using alternative fuels

Abstract

Today in Ukraine and the world there is a growing shortage of commercial fuels for engines. This is due to the tendency to regulate the production of hydrocarbons, which is the main raw material for their production. Therefore, in order to reduce oil imports, alternative fuels for diesel engines based on oils and animal fats are be-coming more widespread today. In this regard, intensive work is underway to convert internal combustion engines to biofuels in countries with limited fuel and energy resources, as well as in highly developed countries that have the ability to purchase liquid energy. Biodiesel fuel (biodiesel, RME, RME, FAME, EMAG, etc.) is an environmentally friendly type of biofuel obtained from vegetable and animal fats and used to replace petroleum diesel fuel. In the process of using RME B100 biodiesel fuel on the Renault 2.5 DCI engine, the average diameter of the fuel droplets is increased and the flare opening angle is reduced. This leads to impaired fuel distribution in the areas of the spray torch. Only 50% of the fuel is in the jet shell, which leads to impaired mixing of fuel with air. In the core of the wall there is 18% of fuel, which will spread along the walls and mix poorly with air. The remaining 36% of the fuel will be in the core of the jet, the front of the free jet and the areas of intersection of the near-wall streams, and will partially participate in the mixing. The use of biodiesel fuel RME B100 leads to a delay of heat by 18-20 degrees of rotation of the crankshaft, which will increase fuel consumption and reduce engine power. Thus, according to studies of the Renault 2.5 DCI engine on commercial and biodiesel RME B100, it is established that the use of biodiesel leads to a deterioration of the mixture due to reduced heat and as a result increases fuel consumption, reducing engine power.