分会场

第十届内燃机可靠性技术国际研讨会

摘要

With the development of high strength, compactness and light weight of the internal combustion engine, the thermal load of pis-ton is getting higher and higher. The thermal load of piston can be effectively reduced by using the method of oscillation cooling of cooling oil inside piston gallery. However, the existence of the piston spatial angle of V-type and other multi-cylinder diesel engines will affect the oscillating flow and heat transfer characteristics of gallery, especially in terms of the uneven heat transfer. In this research, the piston gallery is divided into four axial regions (TOP, OUT, BOT and IN) and 12 circumferential regions (ID1~ID12). Some gallery simulation models in group A and B at spatial angles of -90°, -45°, 0°, 45° and 90°, are established, respectively. The heat transfer performance of the axial and circumferential regions of piston galleries under different spatial an-gles are analyzed. The results show that the variation amplitude of heat transfer coefficient of group A in BOT region and IN re-gion can reach 138 W/(m2K) and 135 W/(m2K), and the axial uneven heat transfer of gallery is more intense with the increase of piston spatial angle. In group B, the variation of heat transfer coefficient in the TOP region reaches 70 W/(m2K) at 155°CA, and when the spatial angle is closer to 0°, the uneven heat transfer is more intense. For the piston gallery with different spatial angles, the axial OUT and IN regions and circumferential ID4~ID10 regions are most affected by the spatial angle, and the axial TOP, BOT regions and the axial ID1, ID2, ID12 regions have the largest heat transfer contribution. The results could provide refer-ence for the optimization of the piston gallery of the multi-cylinder diesel engine.

关键词

piston gallery; spatial angle; uneven heat transfer; Oscillating flow

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