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DETERMINATION OF THE ANGLES OF OPENING AND CLOSING GAS VALVES WHEN ORGANIZING IN-TERNAL MIXTURE FORMATION IN SHIP LOW-SPEED GAS-DIESEL ENGINES

Increasing requirements for environmental indicators led to an intensification of research in the field of creating major marine engines capable of using as main gas fuel. Internal mixture formation in ship low-speed engines operating on the gas-diesel cycle can be realized at various parts of the process of air-charge compression, as a result of which the schemes of the gas-fuel supply systems can differ significantly. The duration of the compression of the gas-air mixture greatly influences the occurrence of detonation processes in the cylinder; therefore, the choice of the optimum moment for the supply of gas fuel is an important aspect when choosing the operating parameters of the gas supply system. The time at which the gas enters and the duration of its supply determine to a large extent the pressure in front of the gas valves, which, under given conditions, must ensure that a predetermined amount of gas fuel enters the working cylinder within a given time interval. The above study is devoted to determining the nature of the change in the angles of opening and closing gas valves at various pressures in front of them, taking into account the fact that the process of gas-fuel outflow under conditions of varying counterpressure is of a variable nature.