基于自增强理论的船用柴油机高压油管设计  

Design of High-pressure Fuel Pipe for Marine Diesel Engine Based on Autofrettage Theory

作　　者：陈康 周家勇 肖朝南 林小雪 郑松 肖洋 CHEN Kang;ZHOU Jiayong;XIAO Chaonan;LIN Xiaoxue;ZHENG Song;XIAO Yang(Chongqing Hongjiang Machinery Co.,Ltd.,Chongqing 402160,China)

机构地区：[1]重庆红江机械有限责任公司,重庆402160

出　　处：《内燃机》2024年第5期48-52,共5页Internal Combustion Engines

基　　金：工信部高技术船舶项目(CBG5N21-1-3)。

摘　　要：随着燃油系统压力的提高,高压油管需要进行重新设计或强化。基于自增强理论,对高压油管三向应力与等效应力进行理论分析,并对采用自增强工艺前后的高压油管进行对比计算,进一步开展该工艺下的高压油管关键参数的影响研究,得出油管外径与自增强压力对等效应力的变化规律。结果表明, 200MPa工作压力下未经自增强处理的高压油管内壁面区域已发生塑性变形,而经自增强后的高压油管则处于完全弹性状态;自增强后油管的最大等效应力对油管外径的变化不敏感;自增强压力并非越高越好,自增强压力过高,最大等效应力也将增加。With the increase of fuel system pressure,the high-pressure fuel pipes need to be redesigned or strengthened.Based on autofrettage theory,the stress of high-pressure fuel pipe is analyzed,and the contrast calculation of the pipe before and after autofrettage is carried out.Then the influence of key parameters of autofrettaged high-pressure fuel pipe is further studied,and the variation law of equivalent stress between outer diameter and autofrettaged pressure is obtained.The results show that plastic deformation has occurred on the inner wall of the pipe without autofrettage under working pressure(200MPa);While the autofrettaged fuel pipe is completely in elastic state.The maximum equivalent stress of autofrettaged fuel pipe is not sensitive to the change of outer diameter.And autofrettage pressure is not the higher the better,the maximum equivalent stress will increase if the autofrettage pressure is excessively high.

关 键 词：高压油管 自增强 弹塑性 应力分析 

分 类 号：TK403[动力工程及工程热物理—动力机械及工程]