Development and research of superheated liquefied gas feeding system for internal combustion engines
A new technical solution is proposed that improves and simplifies the mixture process using the flashboiling effect and superheating. An experimental model of the developed liquefied gas engine power system in the liquid state is designed, which allows to improve the energy and environmental performance of the engine, to reduce the consumption of expensive traditional fuel and to bring cheap environmentally friendly gas fuels to the engine.
An experimental study of the process of liquefied gas injection (for one nozzle) was performed, the main operational features and requirements for the operation of such systems were determined. The process of evaporation of liquid fuel is accompanied by a decrease in the temperature of the mixture (experimental data are given in the report), which significantly improves the filling of cylinders for a real engine. That’s why the sprayed mass of the superheated liquid evaporates more quickly and burns better, which can be used both for engines with a preliminary preparation air-fuel mixture and for direct fuel injection. So in modern systems of direct injection (Common Rail) to achieve the required size of droplets spray pressure can be more than 250 MPa. Using the effect of flash boiling of fuel can significantly reduce the required spray pressure (up to 3 MPa), simplify the fuel system and reduce its cost.
A numerical model has been developed that allows simulating the thermohydrodynamic processes of injection of liquefied gases into the feed channel of the prepared air-fuel mixture and for direct injection. Adequacy testing was performed based on real experimental results. Numerical experiments were carried out using the developed model, which allowed determining the optimal thermophysical and design parameters of the gas injection system.
These results could significantly improve both the accuracy of gas fuel metering and the process of combustion of the gas-air mixture in the cylinder of the engine, which allows reducing the toxicity of the exhaust gases to the level of modern requirements