Influence of non-uniformity of fuel supply parameters on diesel engine performance

Abstract

The state of the fuel equipment as a whole can be judged by two generalized parameters characterizing the performance of a diesel engine - its power and specific fuel consumption. The state of the fuel equipment is characterized by the following parameters: injection pressure and the quality of fuel atomization by nozzles, the capacity of the booster pump, the throughput of filter elements for coarse and fine fuel cleaning, the state of the bypass valve, wear of the plunger pairs and discharge valves, the speed of the camshaft of the fuel pump, uneven delivery fuel by pump elements, fuel consumption, advance angle of fuel supply to engine cylinders. During operation, these parameters change due to the deterioration of the state of the elements of the fuel equipment. The initial state of the parameters of the fuel equipment is restored by making the necessary adjustments and replacing the components unsuitable for further operation. Signs of unsatisfactory operation of the fuel equipment can be: difficult start of the diesel engine, unstable operation, smoke of the exhaust gases, a decrease in power and an increase in specific fuel consumption. Improvement of diesel fuel supply systems should be aimed, first of all, at increasing power and fuel efficiency, as well as decreasing smoke and toxicity of exhaust gases, which can be achieved by: increasing the maximum injection pressure; optimization of injection characteristics and reduction of injection duration; correction of the cyclic fuel supply in accordance with the engine operating mode and external factors. With this in mind, this article presents the results of a study of the unevenness of the fuel supply and its effect on the power and economic performance of the diesel engine.