Experimental Study on Heat Transfer Enhancement of Piston Gallery Wall with Micro-Nano Structure Modification

被引：0
|
作者：
Lyu J. [1 ]
Gao L. [1 ]
Chang S. [1 ]
Xing Z. [1 ]
Jiang H. [1 ]
Bai M. [1 ]
机构：
[1] Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian
来源：
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2022年 / 40卷 / 05期
关键词：
Internal combustion engine; Micro-nano structure; Piston cooling oil gallery; Reciprocating oscillation shock heat transfer; Surface modification;
D O I：
10.16236/j.cnki.nrjxb.202205057
中图分类号：
学科分类号：
摘要：
In order to meet the cooling needs of pistons of large-bore marine diesel engines, the cooling oil chamber must be used for forced cooling. However, with the continuous power intensification, the heat exchange of the piston cooling oil gallery has been unable to meet the needs of the high intensifying degree of the low-speed marine diesel engine. In order to improve the heat exchange capacity of the reciprocating piston cooling oil gallery, a micro- nano structure was first used for the cooling oil gallery surface modification without changing any piston structure, and then a reciprocating oscillation heat transfer simulation experiment was used to study its heat transfer enhancement effect. The results show that the best heat transfer filling rate of the reciprocating oscillation shock heat transfer is 50%. It can not only ensure the impact speed of the liquid on the wall surface, but also make the upper wall surface to form an effective liquid film cover. Increase of the rotating speed will increase the mixing degree of the liquid and gas in the gallery, and then strengthen the inner cooling oil gallery within a certain range. After adopting the micro-nano structure with super-hydrophilicity surface, the heat transfer effect is significantly improved, 18% larger than the polished surface. © 2022, Editorial Office of the Transaction of CSICE. All right reserved.
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页码：457 / 462
页数：5
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