王雷雷,郭怡,彭学院
WANG Lei-lei,GUO Yi,PENG Xue-yuan(Xi'an Jiaotong University

• 1:西安交通大学

摘要(Abstract)：

针对CO2跨临界循环压缩机工作压力大、吸排气压差大的特点,将惯性力施加到每个单元体的质心用以将活塞的瞬时受力状态转化为等效的静应力状态进行有限元分析。根据有限元分析结果计算活塞危险点的疲劳安全系数,找出活塞的疲劳危险点。计算结果与试验结果相对比,计算所得疲劳安全系数不合格区域与试验损坏区域相符合,证明此方法可以有效地对CO2活塞压缩机活塞进行疲劳安全设计。
Due to the feature of trans-critical CO2 cycle that compressor works with high pressure and high difference between suction pressure and discharge pressure,the finite element analysis(FEA) has been applied to model and simulate transient stress condition of piston through the way of loading all units their own inertial forces on the center of their mass.Based on the results of finite element simulation,fatigue coefficients in dangerous points were calculated and fatigue dangerous area was found.The compressor of simulated piston was tested and the damaged area of piston compared well with calculated unqualified fatigue area.Thus it demonstrated that this is an efficient method to design the fatigue safety of piston of trans-critical CO2 compressor.

关键词(KeyWords)： 二氧化碳压缩机;活塞;有限元分析;疲劳安全系数
carbon dioxide compressor;piston;finite element analysis;fatigue coefficient

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 王雷雷,郭怡,彭学院
WANG Lei-lei,GUO Yi,PENG Xue-yuan(Xi'an Jiaotong University

参考文献(References)：

• [1]蔡怀崇,闵行.材料力学[M].西安:西安交通大学出版社,2004.
• [2]Silva F S.Fatigue on engine pistons-A compendium of case studies[J].Engineering Failure Analysis,2006,13(3):480-492.
• [3]Floweday G,Petrov S,Tait R B,et al.Thermo-mechani-cal fatigue damage and failure of modern high perform-ance diesel pistons[J].Engineering Failure Analysis,2011,18(7):1664-1674.
• [4]郑永刚,马学军,马呈新,等.有限元分析与疲劳评价在活塞开发中的应用[J].柴油机,2005,27(3):21-23.
• [5]马润梅,韩雯雯,高文涛.活塞压缩机进气阻力损失对容积系数的影响[J].流体机械,2011,39(5):31-34.
• [6]辛电波,邬晓霞,冯健美,等.自润滑活塞环组压力分布的试验研究[J].流体机械,2011,39(2):1-5.
• [7]王建平,胡定云,吴波.柴油机铝合金活塞疲劳寿命预测[J].机械设计与制造,2009,12:149-151.
• [8]Jurgen SUB,Horst Kruse.Heat transfer phenomenainside t he cylinder of CO 2-compressors and the influ-ence on t heir efficiency[C].The proceeding s of the 2nd IIR-Gustav Lorentzen Confer ence on Natur al Working Fluids.Norway,1998.
• [9]乔艳江,孙强,李春旺,等.合金钢与铝合金疲劳极限的理论估算方法分析[J].力学与实践,2007,29(4):47-50.
• [10]高玉华.铝合金LC4和LY12CZ应变率相关力学性能的实验研究[J].上海力学,1995,19(1):61-66.
• [11]迟露鑫,麻永林,邢淑清,等.工艺参数对筒体纵向焊接残余应力影响的模拟研究[J].压力容器,2011,28(9):1-6,25.
• [12]胡志忠,曹淑珍.金属材料的有效应力集中系数预测[J].中国科学,1993,23(1):83-91.