Calculation and Experimental Studies of the Working Parameters of the Gas Piston Engine

The results of studies of the working process of a piston gas engine Perkins 4012 TESI are presented. The engine operates as a part of a stationary cogeneration installation and generates electric and thermal energy at a crankshaft rotation speed of 1500 rpm. In the course of experimental studies, the pressure in the cylinder of a reciprocating engine without an encoder was recorded at various loads: from idling to 600 kW. The technique for determining the position of the marking of the top dead point on the experimental indicator diagram was developed and implemented when this diagram is compared with the calculated theoretical one. It is established that the combustion process consists of two phases. The main phase of active heat release has the duration of 40-50 degrees from the crankshaft rotation. The afterburning phase also has the duration of 50-80 degrees. Theoretical calculations and studies were carried out using the “Double-Wiebe function” program. The indicators of the nature of combustion and the amount of combustion fuel in each phase are determined. The program “Double-Wiebe function” allowed to adequately simulate the working process of a gas piston engine when it operates on homogeneous mixtures. Differences in the values of the calculated and experimental parameters were: specific indicator fuel consumption is not more than 1%; indicator efficiency is not more than 0.5%; maximum combustion pressure is not more than 1%. The calculation model can be used in the modernization and design of reciprocating gas engines intended for operation as part of autonomous power installations.