高压共轨喷油器响应特性的仿真分析

为了分析高压共轨喷油器结构参数的变化对喷油器响应特性的影响,以某型号重型柴油机高压共轨喷油器为研究对象,通过AMESim软件建立喷油器仿真模型,进行试验验证模型准确性.结果表明:进油孔孔径增大会提升开启响应速度但降低喷油器的关闭响应速度,出油孔孔径的增大提高喷油器的开启响应速度;控制柱塞直径的增大会提升喷油器的关闭响应速度但降低喷油器的开启响应速度;针阀密封直径的增大会同时提高开启和关闭响应速度;针阀弹簧预紧力的增加会带来针阀开启时间的延长和关闭时间的缩短.因此喷油器设计开发过程中应合理选取进油孔径取值并适当增大出油孔径及针阀密封直径.为高压共轨喷油器结构参数的优化设计提供参考.

Numerical simulation of high pressure common rail injector response characteristics

In order to analyze the influence of structure parameters on high pressure common rail injector response characteristics,this paper takes a particular heavy-duty diesel engine high pres-sure common rail injector as the research object,builds the simulation model by using the AMESim software and verifies the accuracy of the model by experiments.The results show that the increase of the inlet hole diameter will enhance the open response speed of the fuel injector but lower its close response speed.With the acceleration of the fuel injector open response speed,the increase of the control plunger diameter will enhance the close response speed of the fuel injector but lower its open response speed;the increase of needle valve sealing diameter will improve the opening and close response speed at the same time,the increase of the needle valve spring pre-tightening force will prolong the needle valve turn-on time and lower its turn-off time.Therefore, in the process of the injector design,the inlet hole diameter should be chosen carefully,and the outlet hole and needle valve sealing diameter should be increased appropriately.It can be applied as theoretical guidance for the optimization of structural parameters of high pressure common rail injector.