A transient numerical study for heat transfer and flow characteristics of dimpled piston cooling gallery of a diesel engine
Piston cooling gallery is an effective cooling method to achieve an acceptable piston temperature field. This paper aims to analyze the effects of teardrop dimples size and dimple head-and-tail orientation on flow and heat transfer inside the cooling gallery. To do so, the computational fluid dynami...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-05-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X23002368 |
| _version_ | 1827953421487964160 |
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| author | Jinkun Wang Xiwen Deng Guangyi Xie Jilin Lei Dewen Jia |
| author_facet | Jinkun Wang Xiwen Deng Guangyi Xie Jilin Lei Dewen Jia |
| author_sort | Jinkun Wang |
| collection | DOAJ |
| description | Piston cooling gallery is an effective cooling method to achieve an acceptable piston temperature field. This paper aims to analyze the effects of teardrop dimples size and dimple head-and-tail orientation on flow and heat transfer inside the cooling gallery. To do so, the computational fluid dynamics model for galleries with different teardrop dimples were established. The results indicate that the local oil flow patterns in the axial and circumferential directions are affected by the dimples. Compared with smooth gallery, the presence of dimple enlarges the fluid charge ratio (FCR). Specifically, when radius of teardrop shaped dimples are R2 and R3 respectively, their corresponding gallery FCRs achieve 55% and 58%. Further, the variation in FCR makes a difference in the distribution of heat transfer, an in-depth analysis finds the dimples increase the heat transfer area between the gallery surface and the oil and simultaneously reduce the space of oil suspending in the gallery. Therefore, the heat transfer coefficient of a dimpled gallery is always greater than that of the smooth gallery, with the maximum improvement of 2.42%. Moreover, the change of heat transfer distribution reconstructs the heat transfer uniformity of the cooling gallery, with the maximum improvement of 24.25%. |
| first_indexed | 2024-04-09T14:13:40Z |
| format | Article |
| id | doaj.art-fbebca38a2cb426c82926b63bd24e839 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-04-09T14:13:40Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-fbebca38a2cb426c82926b63bd24e8392023-05-06T04:37:55ZengElsevierCase Studies in Thermal Engineering2214-157X2023-05-0145102930A transient numerical study for heat transfer and flow characteristics of dimpled piston cooling gallery of a diesel engineJinkun Wang0Xiwen Deng1Guangyi Xie2Jilin Lei3Dewen Jia4Yunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming, 650500, PR China; Yunnan Province Key Laboratory of Plateau Emissions of Internal Combustion Engines, Kunming Yunnei Power Co., Ltd., Kunming, 650200, PR ChinaYunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming, 650500, PR China; Corresponding author.Yunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming, 650500, PR ChinaYunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming, 650500, PR China; Yunnan Province Key Laboratory of Plateau Emissions of Internal Combustion Engines, Kunming Yunnei Power Co., Ltd., Kunming, 650200, PR ChinaYunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming, 650500, PR ChinaPiston cooling gallery is an effective cooling method to achieve an acceptable piston temperature field. This paper aims to analyze the effects of teardrop dimples size and dimple head-and-tail orientation on flow and heat transfer inside the cooling gallery. To do so, the computational fluid dynamics model for galleries with different teardrop dimples were established. The results indicate that the local oil flow patterns in the axial and circumferential directions are affected by the dimples. Compared with smooth gallery, the presence of dimple enlarges the fluid charge ratio (FCR). Specifically, when radius of teardrop shaped dimples are R2 and R3 respectively, their corresponding gallery FCRs achieve 55% and 58%. Further, the variation in FCR makes a difference in the distribution of heat transfer, an in-depth analysis finds the dimples increase the heat transfer area between the gallery surface and the oil and simultaneously reduce the space of oil suspending in the gallery. Therefore, the heat transfer coefficient of a dimpled gallery is always greater than that of the smooth gallery, with the maximum improvement of 2.42%. Moreover, the change of heat transfer distribution reconstructs the heat transfer uniformity of the cooling gallery, with the maximum improvement of 24.25%.http://www.sciencedirect.com/science/article/pii/S2214157X23002368Cooling galleryDimpleTwo-phase flowHeat transfer |
| spellingShingle | Jinkun Wang Xiwen Deng Guangyi Xie Jilin Lei Dewen Jia A transient numerical study for heat transfer and flow characteristics of dimpled piston cooling gallery of a diesel engine Case Studies in Thermal Engineering Cooling gallery Dimple Two-phase flow Heat transfer |
| title | A transient numerical study for heat transfer and flow characteristics of dimpled piston cooling gallery of a diesel engine |
| title_full | A transient numerical study for heat transfer and flow characteristics of dimpled piston cooling gallery of a diesel engine |
| title_fullStr | A transient numerical study for heat transfer and flow characteristics of dimpled piston cooling gallery of a diesel engine |
| title_full_unstemmed | A transient numerical study for heat transfer and flow characteristics of dimpled piston cooling gallery of a diesel engine |
| title_short | A transient numerical study for heat transfer and flow characteristics of dimpled piston cooling gallery of a diesel engine |
| title_sort | transient numerical study for heat transfer and flow characteristics of dimpled piston cooling gallery of a diesel engine |
| topic | Cooling gallery Dimple Two-phase flow Heat transfer |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X23002368 |
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