CNG发动机活塞热-机耦合应力分析

陈洋; 何畏; 贺军超; 熊尉伶; 杨志勇; 张自立

doi:10.13433/j.cnki.1003-8728.2017.1222

CNG发动机活塞热-机耦合应力分析

doi: 10.13433/j.cnki.1003-8728.2017.1222

1.
西南石油大学机电工程学院, 成都 610500;
2.
四川省特种设备检验研究院, 成都 610061;
3.
吉利四川商用车有限公司, 四川南充 637000

基金项目:

四川省科技支撑计划项目（2015GZ0159）资助

详细信息

作者简介:
陈洋(1991-),硕士研究生,研究方向为CNG发动机结构设计及可靠性分析,swpuchy@163.com

通讯作者:
何畏(联系人),副教授,高级工程师,xuezhu9@sina.com

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- 文章访问数: 139
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- 被引次数: 0
出版历程
- 收稿日期: 2016-07-26
- 刊出日期: 2017-12-15

Thermo-mechanical Coupling Stress Analysis of CNG Engine Piston

1.
School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China;
2.
Sichuan Special Equipment Inspection Institute, Chengdu 610061, China;
3.
Geely Sichuan Commercial Vehicle Co., Ltd., Sichuan Nanchong 637000, China

摘要

摘要: 随着CNG发动机不断地向着高速化、大功率的方向发展，使得活塞销座由于应力集中而引起疲劳裂纹。为此，设计了一种新型弧面衬套活塞销座，对衬套进行了运动分析和装配条件分析。通过有限元方法分析了活塞在机械载荷、热-机耦合载荷条件下的应力分布状态。研究结果表明：在机械载荷作用下，新型活塞-衬套的Mises应力比原活塞降低了25.3%，新型活塞销座最大Mises应力比原活塞降低了27.9%，新型活塞销座的接触应力比原活塞降低了35.4%。活塞在热-机耦合载荷作用下的应力状态与在机械载荷作用下的结果相似，活塞应力状态都有很大改善。装配有衬套的活塞销座的应力分布更加的均匀，更容易形成润滑油膜。因此，该结构具有降低活塞销座应力、提高润滑能力和提高活塞销座的疲劳寿命的优点。
- CNG发动机 /
- 活塞 /
- 弧面衬套 /
- 结构设计 /
- 耦合分析 /
- 应力
Abstract: As the compressed natural gas (CNG) engine moves toward the direction of high speed and high power development, the piston pin hole stress is greater, causing fatigue crack on the piston pin hole. Therefore, we design the new structure of an arc surface bush piston pin hole. Such piston bush is derived from the movement analysis and assembly conditions analysis. The stress distribution state of the piston under different load conditions of mechanical load and thermo-mechanical coupling load were analyzed with the finite element method. Simulation results show that the Mises stress of the new structured piston bush decreases by 25.3%, that the Mises stress of the new structured piston pin hole decreases by 27.9% compared with the original structured piston and that its contact stress decreases by 35.4% under the mechanical load. The analysis results on the piston stress state of the thermo-mechanical coupled load are similar to those on the mechanical load. In addition, the piston's stress state has been greatly improved. The stress distribution of the piston pin hole with an arc surface bush is more homogeneous; it is easier to form oil film on the arc surface bush. Therefore, the new structure of the piston pin hole with arc surface bush has strong capability of decreasing stress and increasing the lubricity and anti-wear ability.
- CNG engine /
- piston /
- arc surface bush /
- structural design /
- coupling stress analysis /
- stresses

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参考文献(22)

[1]	张坤鹏.满足国Ⅴ排放的天然气发动机开发[D].天津:天津大学,2011 Zhang K P. Development of CNG engine for meeting China stage V emission regulations[D]. Tianjin:Tianjin University, 2011(in Chinese)
[2]	贾承造,张永峰,赵霞.中国天然气工业发展前景与挑战[J].天然气工业,2014,34(2):1-11 Jia C Z, Zhang Y F, Zhao X. Prospects of and challenges to natural gas industry development in China[J]. Natural Gas Industry, 2014,34(2):1-11(in Chinese)
[3]	陆家亮,赵素平.中国能源消费结构调整与天然气产业发展前景[J].天然气工业,2013,33(11):9-15 Lu J L, Zhao S P. Optimization of energy consumption structure and natural gas industry development prospect in China[J]. Natural Gas Industry, 2013,33(11):9-15(in Chinese)
[4]	张志勇.天然气发动机活塞温度测量及热负荷分析[D].武汉:华中科技大学,2005 Zhang Z Y. Temperature measurement and thermal loading analysis of piston of CNG engine[D]. Wuhan:Huazhong University of Science and Technology, 2005(in Chinese)
[5]	祖炳锋,方强,刘捷,等.基于热机耦合的国-Ⅴ柴油机活塞强度及变形数值分析[J].内燃机工程,2014,35(1):99-104 Zu B F, Fang Q, Liu J, et al. Numerical analysis of piston strength and deformation based on thermo-mechanical coupling for China-V diesel engine[J]. Chinese Internal Combustion Engine Engineering, 2014,35(1):99-104(in Chinese)
[6]	冯立岩,高希彦,夏惠民,等.8E160柴油机活塞组热负荷及机械负荷耦合分析[J].内燃机学报,2002,20(5):441-446 Feng L Y, Gao X Y, Xia H M, et al. The coupled thermal and mechanical load analysis in the 8E160 type diesel's piston assembly[J]. Transactions of CSICE, 2002,20(5):441-446(in Chinese)
[7]	石宏娟.发动机活塞销孔结构改进的有限元分析[D].太原:中北大学,2009 Shi H J. The finite element analysis of piston pin hole engines to improve structure[D]. Taiyuan:North University of China, 2009(in Chinese)
[8]	Floweday G, Petrov S, Tait R B, et al. Thermo-mechanical fatigue damage and failure of modern high performance diesel pistons[J]. Engineering Failure Analysis, 2011,18(7):1664-1674
[9]	Silva F S. Fatigue on engine pistons-A compendium of case studies[J]. Engineering Failure Analysis, 2006,13(3):480-492
[10]	童宝宏,张强.不同工况下柴油机活塞变形的三维有限元分析[J].农业工程学报,2010,26(9):159-163 Tong B H, Zhang Q. 3-D finite element analysis of piston deformation under different operating conditions of diesel engine[J]. Transactions of the CSAE, 2010,26(9):159-163(in Chinese)
[11]	刘世英,田小青,潘风敏.发动机活塞销孔座机械疲劳机理的研究[J].汽车工程,2014,36(1):57-60 Liu S Y, Tian X Q, Pan F M. A research on the mechanical fatigue mechanism of engine piston pin boss[J]. Automotive Engineering, 2014,36(1):57-60(in Chinese)
[12]	张文利.活塞销孔结构设计与试验研究[D].济南:山东大学,2006 Zhang W L. The structure design and test research of the piston pin bore[D]. Ji'nan:Shandong University, 2006(in Chinese)
[13]	任伟霞,雷春伟,高一新.高速大功率柴油机活塞销材料及加工工艺优化[J].金属热处理,2012,37(1):34-37 Ren W X, Lei C W, Gao Y X. Optimization of material and process technology for piston pin of high speed and power diesel engine[J]. Heat Treatment of Metals, 2012,37(1):34-37(in Chinese)
[14]	刘晓,梁红玉.Al-Si30活塞温度场和应力场有限元分析[J].机械科学与技术,2011,30(1):116-119,123 Liu X, Liang H Y. Finite elements analysis of temperature field and stress field of Al-Si30 piston[J]. Mechanical Science and Technology for Aerospace Engineering, 2011,30(1):116-119,123(in Chinese)
[15]	陈洋, 何畏,马惠平,等.一种带圆弧面衬套的活塞:中国,201520997241.8[P].2016-04-27 Chen Y, He W, Ma H P, et al. Take piston of arc surface bush:China, 201520997241.8[P]. 2016-04-27(in Chinese)
[16]	傅成昌,傅晓燕.天然气机构造与使用[M].北京:石油工业出版社,2007 Fu C C, Fu X Y. Structure and use of natural gas engine[M]. Beijing:Petroleum Industry Press, 2007(in Chinese)
[17]	卢建军,邱明,李迎春.自润滑向心关节轴承磨损寿命模型[J].机械工程学报,2015,51(11):56-63 Lu J J, Qiu M, Li Y C. Wear life models for self-lubricating radial spherical plain bearings[J]. Journal of Mechanical Engineering, 2015,51(11):56-63(in Chinese)
[18]	鲍登F P,泰伯D.固体的摩擦与润滑[M].陈绍澧,译.北京:机械工业出版社,1982 Bowden F P, Tabor D. The friction and lubrication of solids[M]. Chen S L, Trans. Beijing:China Machine Press, 1982(in Chinese)
[19]	吴喜骊,蒋芳,徐斌.发动机活塞温度场试验与有限元分析[J].现代制造工程,2012,(1):76-78,106 Wu X L, Jiang F, Xu B. Temperature measurement and finite element analysis of engine piston[J]. Modern Manufacturing Engineering, 2012,(1):76-78,106(in Chinese)
[20]	司鹏鵾,张惠明,杨志勇,等.燃烧室结构对稀燃天然气发动机性能的影响[J].农业机械学报,2009,40(4):53-57 Si P K, Zhang H M, Yang Z Y, et al. Influence of the combustion chamber structure on the lean burn CNG engine performance[J]. Transactions of the Chinese Society for Agricultural Machinery, 2009,40(4):53-57(in Chinese)
[21]	田城.YC6MK375N-30型CNG发动机活塞热-机耦合分析与疲劳寿命预测[D].武汉:武汉理工大学,2013 Tian C. Thermal-mechanical coupling analysis and fatigue simulation of YC6MK375N-30 CNG engine's piston[D]. Wuhan:Wuhan University of Technology, 2013(in Chinese)
[22]	Cerit M, Coban M. Temperature and thermal stress analyses of a ceramic-coated aluminum alloy piston used in a diesel engine[J]. International Journal of Thermal Sciences, 2014,77:11-18