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| Thermal load analysis and optimization of high power density diesel engine cylinder head |
| LIU Zhen-tao1, CHEN Si-nan1, HUANG Rui1, YIN Xu1, YU Xiao-li1, WEI Zhi-ming2, ZHANG Quan-zhong2 |
| 1. Power Machinary and Vehicular Engineering Institute, Zhejiang University, Hangzhou 310027, China;2. China North Engine Research Institute, Tianjin 300400, China |
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Abstract To evaluate the thermal load level and security of a newly designed cylinder head, with a V8, high power density diesel engine as the research object, the fluid-structure coupling simulation of the cylinder head and water jacket on one single side was calculated and the thermal-mechanical coupling stress analysis of the same cylinder head was performed considering the imbalance of each cylinder explosion. It was found that the highest temperature and the maximum thermal stress on these four flame decks respectively appears on the exhaust bridge zone and the intake bridge zone of the 3rd flame deck. Based on the analysis on the results, water jacket improvements were made. According to the position and the number of the holes, a set of optimization ideas were put forward, eventually the optimized scheme of obvious effects was got and compared with the original scheme. Results show that on the flame deck of the optimized scheme the highest temperature reduced 6.2 K, the maximum equivalent stress reduced 21.4 MPa, which can provide certain references for design optimization of diesel engine cylinder head.
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Published: 01 August 2015
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高功率密度柴油机气缸盖热负荷分析与优化
为了评估某新机型气缸盖的热负荷水平和安全性,以某V8高功率密度柴油机为研究对象,进行单侧气缸盖和水套的流固耦合分析以及单侧气缸盖热机耦合应力分析,其中应力分析考虑到各缸爆发的不平衡性.发现在4个缸火力面上最高温度和最大热应力分别出现在第3缸火力面排气门鼻梁区和进气门鼻梁区.在分析结果基础上进行水套改进,根据上水孔的位置和作用提出一套优化思路,最终得到优化效果明显的方案并与原方案进行比较.结果表明,优化方案火力面最高温度降低6.2 K,火力面最高等效应力降低了21.4 MPa,可以为柴油机气缸盖的设计优化提供一定参考.
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| ［1］ 李骏.汽车发动机节能减排先进技术［M］.北京：北京理工大学出版社,2011: 66-76.
［2］ BHARANI D R, RAGHU R G, RAJKAMAL M, et al. Design and development of cylinder block for high power density diesel engine using CAE/CFD tools for a tractor engine with integrated approach ［C］∥ 8th SAEINDIA International Mobility Conference & Exposition and Commercial Vehicle Engineering Congress 2013. Chennai: SAE, 2013： 01-2753.
［3］ ZHANG Q, ZUO Z X, LIU J X. Failure analysis of a diesel engine cylinder head based on finite element method ［J］. Engineering Failure Analysis,2013,34: 51-58.
［4］ JAFARABADI M, CHAMANI H, MALAKIZADI A, et al. A fast coupled CFD-thermal analysis of a heary duty diesel engine water cooling system ［C］∥ASME 2008 International Mechanical Engineering Congress and Exposition. Boston: American Society of Mechanical Engineers, 2008: 663-670.
［5］ FADAEI M, VAFADAR H,NOORPOOR A. New thermo-mechanical analysis of cylinder heads using a multi-field approach ［J］. Scientia Iranica, 2011, B18(1): 66-74.
［6］ FONTANESI S,GIACOPINI M. Multiphase CFD-CHT optimization of the cooling jacket and FEM analysis of the engine head of a V6 diesel engine ［J］.Applied Thermal Engineering, 2013, 52: 293-303.
［7］ SHOJAEFARD M H,GHAFFARPOUR M R, NOORPOOR A R, et al. Thermomechanical analysis of an engine cylinder head ［J］. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 2006, 220: 627-636.
［8］ GOCMEZ T, PISCHINGER S. A contribution to the understanding of thermomechanical fatigue sensitivities in combustion engine cylinder heads ［J］. Proceedings of the Institution of Mechanical Engineers, 2011, 225: 461-477.
［9］ HAMM T,REBBERT M, ECKER H, et al. Cylinder head design for high peak firing pressures［C］∥ SAE World Congress & Exhibition. Detroit: SAE,2008-01-1196.
［10］ 王兆文,黄荣华,成晓北,等. 重型车用柴油机气缸盖内流动与传热研究［J］. 汽车工程,2008,30(4)： 312-316.
WANG Zhao-wen, HUANG Rong-hua, CHENG Xiao-bei, et al. Studies on flow and heat transfer in cylinder head of a heavy-duty vehicle diesel engine ［J］. Automotive Engineering, 2008,30(4)： 312316.
［11］ 刘福水,闵祥芬,樊丰,等. 柴油机冷却水套的优化设计方法［J］. 汽车工程,2014,36(6)： 728-733.
LIU Fu-shui, MIN Xiang-fen, FAN Feng, et al. Optimization design of cooling water jacket in diesel engines［J］. Automotive Engineering,2014,36(6)： 728-733.
［12］ 周禛,薛冬新,唐斌,等.某中速柴油机冷却液流动及流固耦合传热计算分析［J］. 柴油机,2013,35（1）： 17-21.
ZHOU Zhen, XUE Dong-xin, TANG Bin, et al. The flow and fluid-solid coupled heat transfer analysis of a medium speed diesel engine cooling system ［J］. Diesel Engine,2013,35(1)： 17-21. |
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