UDC 665.7.035 + 665.753
DOI 10.36461/NP.2023.66.2.019
METHOD FOR THE INTEGRAL ESTIMATION OF HEAT RELEASE DURING THE PROCESS OF COMBUSTION OF MOTOR FUELS IN A MULTI-CYLINDER DIESEL ENGINE USING EXPANDED INDICATOR DIAGRAMS
D.A. Ukhanov1, Doctor of Technical Sciences, Professor; D.A. Manshev1, Doctor of Technical Sciences, Associate Professor; A.P. Ukhanov1, Doctor of Technical Sciences, Professor
1Federal Autonomous Establishment "The 25th State Research Institute of Chemmotology of the Ministry of Defence of the Russian Federation", Moscow, Russia;
1Federal State Budgetary Educational Institution of Higher Education "Penza State Agrarian University", Penza, Russia, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
To estimate the heat release during the combustion of new or modified diesel fuels in the delayed combustion and afterburning phases on the expansion line of the expanded indicator diagram of a diesel engine, a new method has been developed which consists of determining the difference between the areas bounded by the fuelinjected and non-fuel-injected indicator diagrams, as well as the ordinates of the start of the delayed combustion phase and the start of stabilization of the minimum cylinder gas pressures at the end of the expansion stroke. This area of the indicator diagram is calculated in conventional units (c.u.) by numerical integration using the trapezoidal rule when the diesel engine is running on experimental and control fuels at different load and speed modes. If the obtained difference of the areas of indicator diagrams, which is considered as an integral indicator of heat release, does not exceed the rejection value of 0.0025 c.u., then, the new or modified fuel is recommended for use in a full-size diesel engine together with pre-determined regulated indicators of physical, chemical and operational properties.
Keywords: diesel fuel, expanded indicator diagrams, combustion process, heat release, estimated indica-tors.
