【摘要】 内燃机活塞处在复杂的受热状态,确定各部分换热边界条件成为活塞温度场研究的难点和重点。直接流热耦合法将活塞及与其相互作用固体和流体部分作为一个整体进行研究,将难以确定的外部边界条件转化为内边界,通过能量守恒的方法在固-液交界面上自动完成热量交换。使用CFD软件STAR-CD利用建立的活塞组、机体和冷却水套组成耦合模型,采用直接流热耦合方法计算了某汽油机活塞温度场,计算结果和实验值吻合得较好。更多还原

【Abstract】 The piston of IC engine works in complicated thermal conditions. How to calculate those thermal boundary conditions is the key issue for piston temperature field research. In the paper, directly coupled fluid-heat simulation is discussed, which treats piston and its thermal interactions as a whole and ultimately solving them together. It can transform the exterior boundary condition into the internal boundary conditions. Energy conservation is employed in this method to complete heat exchange along the solid - fluid interface automatically. Directly coupled fluid-heat simulation is employed in this paper to investigate the temperature field of piston in a gasoline engine by using of CFD software STAR-CD. Computational model includes piston assembly, cylinder block and water jacket. Calculating results with this method and measuring values are very well accordant.更多还原