International Journal of Engine Research ( IF 2.5 ) Pub Date : 2021-01-17 , DOI: 10.1177/1468087420987367 Chuqiao Wang 1, 2 , Moro Adams 3 , Tianyu Jin 1 , Yu sun 1 , Andreas Röll 1, 4 , Fuqiang Luo 1 , Manolis Gavaises 2
Past experimental studies have shown that the needle valve of high-pressure diesel injectors undergoes lateral movement and deformation, while the continuous increase in injection pressure enlarges the gap of the needle valve assembly. Two different analytical models, considering or omitting this change are presented here, linking the geometries of the needle valve assembly with the magnitude of needle valve tip lateral movement. It is found that the physical dimensions of the needle valve assembly and the injection pressure have a significant impact on the radial displacement of the needle. For example, for nominal clearances between the needle guidance and the needle valve of about 1–3 μm, the magnitude of the radial movement of the needle tip could reach tens of microns. The model that takes into account the variation of the gap between the needle guide and needle valve is found to give predictions closer to the experimental results.
中文翻译:
柴油机喷油器针阀偏心运动的解析模型
过去的实验研究表明,高压柴油机喷油器的针阀会发生横向运动和变形,而不断增加的喷射压力会增大针阀组件的间隙。本文介绍了两种考虑或忽略此变化的不同分析模型,它们将针阀组件的几何形状与针阀尖端横向运动的幅度联系在一起。发现针阀组件的物理尺寸和注射压力对针的径向位移有显着影响。例如,对于针头导向装置和针阀之间的名义间隙约为1-3μm,针尖的径向运动幅度可能达到数十微米。