Study on the Influence of Fuel Injection Characteristics on F-T Fischer-Tropsch Fuel Pressure Oscillation
In order to reduce the combustion noise and determine the key factors that affect the high-frequency pressure oscilla-tion of the diesel engine,a clean alternative fuel Fischer-Tropsch(FT)coal-to-liquid is used in a certain type of electronically controlled high-pressure common rail diesel engine,and the typical operating conditions of the diesel engine are selected.The time-domain and frequency-domain characteristics of diesel engine combustion pressure oscillations under different injection characteristics are studied.The results show that the advance angle of the main injection after the push and the advance angle of the pre-injection will reduce the heat release rate,the pressure oscillation amplitude will decrease,and the cylinder pressure level will also significantly decrease;reducing the pre-injection amount will increase the pressure The rate and heat release rate are re-duced,the sound pressure level of the cylinder is reduced,the pressure oscillation phenomenon is slowed down,and the combus-tion is softer.Increasing the injection pressure will increase the fuel injection rate,increase the fuel atomization effect,and in-crease the heat release rate of the mixture.The heat rate curve also rises,the sound pressure level of the cylinder increases,and the oscillation amplitude of the combustion pressure in the engine cylinder increases.The injection pressure is the most significant pa-rameter that affects the pressure oscillation.When the injection pressure rises from 85MPa to 115MPa,the amplitude of the pres-sure oscillation more than doubles;the amount of pre-injection has no significant effect on the combustion pressure oscillation of the FT coal-to-liquid engine;at the same time,the generation of pressure oscillation and the change of heat release rate show a strong correlation.
High-Pressure Common Rail Diesel EngineF-T Coal-to-LiquidCombustion CharacteristicsPres-sure OscillationFuel Injection Characteristics
NETL
NSTL
万方数据
维普
