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针对高压共轨喷油器内部非稳态流动现象,建立起瞬态流动的物理数学模型,采用模块化分析方法进行了瞬态数值模拟.通过与试验结果的比较,验证了数值计算模型的准确性.在此基础上通过变参数数值模拟,分析了电磁阀通电时间、共轨压力、控制室进出口节流孔孔径及针阀弹簧预紧力对喷油过程的影响.结果表明:高压共轨喷油器不同结构参数对其动态特性、喷油率及循环喷油量等性能指标有很大的影响.其中,控制室进出口节流孔孔径的合理匹配和组合对获得良好的喷油特性尤为关键;燃油喷射系统要实现预喷,电磁铁的响应速度必须非常快.
Aiming at the unsteady flow phenomenon in high pressure common rail injector, the transient mathematical model of transient flow was established and the transient numerical simulation was carried out by using the modular analysis method. The numerical simulation model was verified by comparison with the experimental results On the basis of this, the influence of the electrification time of the solenoid valve, the common rail pressure, the orifice diameter of the throttle at the control room and the pre-tightening force of the needle valve spring on the injection process was analyzed by the variable parameter numerical simulation. The different structural parameters of the rail injector have a great impact on the performance characteristics of the dynamic characteristics, fuel injection rate and the amount of circulating fuel injection, etc. Among them, the reasonable match and combination of the throttle orifice of the control room inlet and outlet to obtain a good fuel injection The characteristics are particularly critical; for a fuel injection system to achieve pre-injection, the electromagnet must respond very fast.