Investigation of the combustion process of a diesel engine when working on a mixed fuel

Abstract

The aim of the study is dependences of the indicators of the combustion process of a diesel engine when it is operating on various mixed fuel (MF). For this, an experimental setup was developed. As a result of the studies carried out, for the first time, combined indicator diagrams and the dependences of the averaged cycle temperature on the crankshaft angle were obtained when the diesel engine is operating on various MF. Data analysis showed a decrease in the maximum pressure in the cylinder from 11.5 to 11 MPa, the maximum and average rate of pressure rise from 0.65 to 0.5 and 0.24 to 0,2 MPa/degree, respectively, shortening the fast combustion phase from 6.5 to 4.2 degrees and the period of slowed-down combustion from 40 to 34 degrees, a decrease in the average temperature of the cycle from 2920 to 2810 K, an increase in the apparent combustion pressure from 7.4 to 7.6 MPa, the ignition delay period from 20.4 up to 22.5 degrees, increasing the period of controlled combustion from 10 to 14 degrees, the period of the main combustion by 4 degrees when the share of rapeseed oil in MF changes from 0 to 80%.