船用柴油机喷嘴液力负荷有限元分析及结构改进  

Finite Element Analysis on the Hydraulic Load in Nozzle of Marine Diesel Engine and Its Structure Improvement

作　　者：袁江涛[1] 欧阳光耀[1] 刘镇[1] 张天峰 

机构地区：[1]海军工程大学船舶与动力学院,武汉430033 [2]海军驻兴平地区军代表室,陕西兴平713105

出　　处：《武汉理工大学学报（交通科学与工程版）》2007年第1期5-8,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国防"十五"预研项目资助(批准号:401010401)

摘　　要：建立了某船用柴油机喷嘴内部流动的三维CFD计算模型,用计算流体力学软件AN SY S-FLOTRAN对喷嘴内的三维流动进行了模拟分析,得到了喷嘴内部的液压分布,然后将该结果作为边界条件对喷嘴的液力负荷进行了三维有限元分析.结果表明,在高压液力负荷作用下,喷嘴头部的应力梯度较大,喷孔进口内侧上端应力值最大,且存在应力集中.在喷孔进口处倒一半径为0.05 mm的圆角,再次对喷嘴的液力负荷进行分析,发现喷孔进口内侧上端的应力值降低了34%,应力集中也得到了有效缓解.Three-dimension calculation model of flow in the nozzle of a certain diesel engine is set up. Simulation of fluid flow in the nozzle is performed by computational fluid dynamics software package ANSYS FLOTRAN. Pressure distribution in the nozzle is obtained. Then finite element analysis of the nozzle is performed using the above result as boundary condition. Results show that under high hydraulic pressure, stress gradient in the end of nozzle is great and the stress in the upper end inside the orifice is the highest, and stress concentration is obvious there. When a fillet with 0.05mm radius is made in the entrance of the orifice, the stress in that place has been reduced evidently. Stress concentration is eliminated.

关 键 词：柴油机 喷嘴 应力 CFD FEA 圆角 

分 类 号：TK423.8[动力工程及工程热物理—动力机械及工程]