气体机燃气喷射阀局部特征尺寸与结构应力相关性研究

Study on Correlation Between Local Characteristic Size and Structural Stress of Gas Injection Value in Gas Engine

针对燃气喷射阀阀片特征尺寸与结构强度的相关性,建立阀片阀座几何模型,基于有限元仿真平台进行阀片冲击阀座的动态数值模拟,分析阀片撞击阀座瞬间的应力分布云图,以及阀片关键节点位移和结构应力随时间的变化规律,得到阀片应力集中位置,设计正交试验获取数据进行阀片特征尺寸与最大结构应力的相关性分析。结果表明:阀片厚度与结构应力有强相关性,梯形槽夹角次之,而圆角的改变对于结构应力的影响略小。

In view of the blindness of the correlation between the characteristic size type and structural strength of the gas injection valve disc,the geometric model of the valve disc seat is established by using the modeling environment,the dynamic numerical simulation of the valve disc impacting the valve seat is carried out based on the finite element simulation platform,and the stress distribution cloud diagram at the moment of the valve disc impacting the valve seat is analyzed.And the change law of key node displacement and structural stress of the valve plate with time,the stress concentration position of the valve plate is obtained,and the orthogonal test is designed to obtain the data to analyze the correlation between the characteristic size of the valve plate and the maximum structural stress.The results show that the thickness of the valve plate is strongly related to the structural stress,the included angle of the trapezoidal groove is the second,and the change of the fillet has little effect on the structural stress.