热障涂层活塞热应力高阶控制体有限元法研究
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1.中国空气动力研究与发展中心空气动力学国家重点实验室;2.中国航空工业集团公司西安航空计算技术研究所

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TK422

基金项目:

国家自然科学基金(11972359, 11972361); 国家数值风洞工程


High-order control volume finite element method for thermal stress analysis of the piston with thermal barrier coating
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Affiliation:

1.State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center;2.Xi’an Aeronautics Computing Technique Research Institute, AVIC

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    摘要:

    为研究热障涂层(thermal barrier coating, TBC)活塞热应力问题,本文发展了一种针对复合材料热力问题的三维高阶控制体有限元法(CV-FEM). 我们基于10点高阶四面体单元,对控制方程数值离散过程做了详细推导; 利用交错网格技术,将待解变量及材料物性参数分别存储在单元节点以及单元中心; 采用高阶CV-FEM对圆环热应力问题进行了数值验证,计算结果与ANSYS吻合良好; 数值模拟了层和型及功能梯度型(functional graded material, FGM)活塞热应力问题. 结果表明:活塞的最大温度位于燃烧室与活塞顶面的交界区域;最大应力位于粘结层附近,改变层和型TBC活塞材料组分、材料分布或改变FGM TBC活塞的材料梯度系数,均不能有效降低最大应力幅值;通过在粘结层内引入材料属性由金属基体材料到粘结剂材料过渡的FGM,可以有效降低层合型及功能型TBC活塞涂层内应力幅值,使应力幅值下降20%~30%,改善了应力集中问题.

    Abstract:

    To study the thermal stress of thermal barrier coating (TBC) piston, a new three-dimensional control volume finite volume method (CV-FEM) has been developed for thermal stress problem with composite material. The numerical discrete process of the governing equation is given in detail with 10-node high-order tetrahedral grid. Using the staggered grid technique, the unknown variables are defined at the cell vertex, while the physical parameters of material are defined at the cell center.The developed high-order CV-FEM was used to simulate the thermoelastic fields of annulus, the predicted results show good agreement with the ANSYS results. Then, the developed CV-FEM was used to simulate the thermoelastic field of the piston with laminated material and functional graded material (FGM). The results show that the maximum temperature is located in the boundary area between the combustion chamber and the top surface, and the maximum stress is around the cohesive layer, the maximum stress amplitude cannot be effectively reduced by changing the composition and distribution of the laminated TBC piston, or by changing the material gradient coefficient of FGM TBC piston, the maximum stress in the laminated and FGM pistons can be reduced effectively by introducing FGM which material properties gradually change from metal matrix to adhesive into the cohesive layer, the maximum stress can be decreased about 20%~30%, and the stress concentration problem can be improved significantly.

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引用本文格式: 刘琦,杜雁霞,齐文亮,刘磊,肖光明. 热障涂层活塞热应力高阶控制体有限元法研究[J]. 四川大学学报: 自然科学版, 2021, 58: 064004.

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历史
  • 收稿日期:2021-05-12
  • 最后修改日期:2021-06-29
  • 录用日期:2021-07-12
  • 在线发布日期: 2021-11-25
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