复杂温度场中不同倾角膜孔蠕变行为研究  

Creep behavior of a film cooling hole at different inclination angles in complex temperature fields

作　　者：张冬旭 吕盟辉 王佳坡 梁建伟 罗壮 温志勋 Dongxu Zhang;Menghui Lv;Jiapo Wang;Jianwei Liang;Zhuang Luo;Zhixun Wen(College of Mechanical and Electrical Engineering,Shaanxi University of Science&Technology,Xi'an 710021,China;School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China;School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]不详

出　　处：《Acta Mechanica Sinica》2023年第10期98-115,共18页力学学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.51805307);the Natural Science Basic Research Program of Shaanxi(Grant Nos.2021JQ-574 and 2023-JC-YB-068).

摘　　要：本文研究了不同倾斜角度下气膜冷却孔薄壁板在复杂温度场中的蠕变行为.采用共轭传热和晶体塑性有限元法相结合进行了数值模拟.结果表明,30°孔和45°孔具有较好的冷却性能,特别是45°孔具有较好的寿命特性.我们发现,减小倾角和增大吹气比都会增大孔周围沿壁厚方向的温度差,从而在冷表面的急性侧产生额外的应力集中,但对应力分布没有显著影响.此外,在气膜冷却过程中,高温导致热表面急性侧的蠕变损伤,而大温差和低温共同决定了冷表面急性侧的损伤.We studied the creep behavior of thin-walled plates with a single film cooling hole at different inclination angles in complex temperature fields.Numerical simulations were carried out by combining the conjugate heat transfer and crystal plastic finite element methods.Simulation results showed that 30°and 45°holes had superior cooling performance,especially 45°holes had better lifetime characteristics.We found that decreasing the inclination angle and increasing the blowing ratio both increase the temperature difference around the hole along the wall thickness direction,which in turn generates additional stress concentrations on the acute side of the cold surface,but did not have a significant effect on the stress distribution.In addition,during film cooling,high temperatures lead to creep damage on the acute side of the hot surface,and large temperature differences together with low temperatures determine damage on the acute side of the cold surface.

关 键 词：晶体塑性有限元 冷却性能 蠕变行为 共轭传热 蠕变损伤 应力集中 温度场 温度差 

分 类 号：TG14[一般工业技术—材料科学与工程]