Simulation and analysis of piezoelectric crystal injector performance based on GT-Power
In order to optimize the performance of piezoelectric crystal injectors of diesel engines,GT-Power is used to establish a simulation model of the high-pressure common-rail piezoelectric crystal injectors,the material properties of the piezoelectric crystals in the model is changed and different voltage conditions is set up so as to simulate and analyse the influence of the elasticity modulus of piezoelectric crystal actuators in the piezoelectric crystal injectors,the driving voltage of the crystal on the effects of the elastic modulus of the piezoelectric crystal actuator,the crystal driving voltage on the displacement of the actuator,the pressure and temperature of the injection needle valve,and the injection volume per cycle.The simulation results show that when the elastic modulus of the piezoelectric crystal injector is more than 75 GPa,the displacement of the actuator increases with the increase of driving voltage.When the elastic modulus of the injector is more than 80 GPa,the pressure and temperature at the injection needle valve increase.Compared with a modulus of elasticity of 55 GPa,when the elastic modulus of the piezoelectric crystal injector is 80 GPa,the displacement of the piezoelectric crystal actuator increases by 15.6%,and the injection volume of the injector per cycle increases by 2.3%.The piezoelectric crystal injector with a modulus of elasticity of 75-80 GPa can increase the injection rate and shorten the injection duration,which is conducive to improving the thermal efficiency of the diesel engine.
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