Improving the Operating Cycle of a Diesel Engine on Biofuel Based on Numerical Modeling

The issues of increasing the efficiency and improving the environmental friendliness of heat engines are urgent problems of mankind. The article deals with the use of biofuel as a fuel for reciprocating internal combustion engines. A brief overview of current research on this topic is presented in the article. This paper presents the results of tuning the working cycle of a turbocharged diesel engine (cylinder diameter 123 mm, piston stroke 156 mm) for operation on bio-diesel fuel (a mixture of diesel fuel and soy methyl ester in a ratio of 80/20). This scientific study is based on mathematical modelling of the working cycle of piston machines. Mathematical modelling of the working cycle was carried out in the Diesel-RK software. A brief description of the physicochemical properties of biofuels is given in the article. A brief analysis of the mathematical model for the engine under study is also presented in the article. The mathematical model was tuned according to more than 30 parameters typical for diesel engines. Based on the results of numerical simulation, a new design of the nozzle atomizer is proposed, the optimal fuel injection advance angle and the fuel supply law for the main modes of diesel engine operation are selected. The proposed measures have led to an increase in effective power (up to 5%), a decrease in specific fuel consumption (up to 6%) and an improvement in environmental friendliness.