Research on the oscillating flow and heat transfer of the cooling gallery inside a multi-material composite piston
The heat transfer ability of cooling gallery inside high-strengthened diesel engine composite piston is highly required. This article established an oscillating heat transfer model for gas-liquid two-phase flow of cooling gallery. Simulated experiments were conducted to calibrate the model. The effe...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
|
| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X2500139X |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The heat transfer ability of cooling gallery inside high-strengthened diesel engine composite piston is highly required. This article established an oscillating heat transfer model for gas-liquid two-phase flow of cooling gallery. Simulated experiments were conducted to calibrate the model. The effects of two oil supply options and different supply rates on the heat transfer characteristics were studied. The results indicate that injection option has a better cooling performance, violent oscillating flow happens in both the outer gallery and the inner cavity. The oil charge ratio (OCR) of injection option schemes stabilizes at about 50 %, and it takes 35–50 cycles to reach stability. VA8 (oil supply rate is 27.6 L/min) has the best cooling effect, its highest temperature is 445.8 °C at the rim of combustion bowl. However, pumping option is not suitable for the piston in this study and similar diesel engines. The oscillating effect is not significant, both low and high oil supply rates lead to a nearly full-filled cooling gallery. Moreover, it takes more than 150 cycles to reach stability. VB4 (oil supply rate is 6.8 L/min) has the best cooling effect among the pumping option schemes, its highest temperature is 511.4 °C, 10.872 % higher than that of VA8. |
|---|---|
| ISSN: | 2214-157X |