单晶涡轮叶片定向凝固过程应力场数值模拟
针对单晶涡轮叶片壁厚尺寸精度偏低和壁厚尺寸漂移大等瓶颈问题,考虑叶片定向凝固过程边界条件不精确因素,通过实际温度数据采集,采用温度场与应力场耦合的有限元模拟方法,对单晶涡轮叶片定向凝固过程进行三维动态模拟,并结合单晶气冷叶片的工作状态,对模拟结果进行定性分析,得到应力分布规律。研究结果表明：当榫头进气窗口倒圆角R=0.5 mm时,叶片最大铸造热应力出现在榫头底面四大进气窗口区域,该区域最大应力比叶身截面最大应力高28.4%;该仿真方法可准确反映单晶涡轮叶片凝固过程温度/应力动态变化,将为避免叶片出现大铸造残余应力区,预防变形工艺,提高叶片壁厚尺寸精度及尺寸稳定性,提供量化参考依据。...
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| Published in | 航空材料学报 Vol. 38; no. 1; pp. 33 - 39 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国航发四川燃气涡轮研究院,成都,610500%西北工业大学机电学院,西安,710072
01.02.2018
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1005-5053 |
| DOI | 10.11868/j.issn.1005-5053.2014.000107 |
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| Summary: | 针对单晶涡轮叶片壁厚尺寸精度偏低和壁厚尺寸漂移大等瓶颈问题,考虑叶片定向凝固过程边界条件不精确因素,通过实际温度数据采集,采用温度场与应力场耦合的有限元模拟方法,对单晶涡轮叶片定向凝固过程进行三维动态模拟,并结合单晶气冷叶片的工作状态,对模拟结果进行定性分析,得到应力分布规律。研究结果表明：当榫头进气窗口倒圆角R=0.5 mm时,叶片最大铸造热应力出现在榫头底面四大进气窗口区域,该区域最大应力比叶身截面最大应力高28.4%;该仿真方法可准确反映单晶涡轮叶片凝固过程温度/应力动态变化,将为避免叶片出现大铸造残余应力区,预防变形工艺,提高叶片壁厚尺寸精度及尺寸稳定性,提供量化参考依据。 |
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| Bibliography: | single crystal hollow turbine blade; unidirectional solidification; coupled temperature/stress; stress field simulation According to the bottle neck problem about low size precision and large wall thickness deviation of the single crystal turbine blade,considering the inaccuracy factors of boundary conditions during unidirectional solidification process,the contact element method was used to study the interaction between the blade and the shuttering. Meanwhile,the practice temperature field data,the finite element method with the coupled stress field and temperature field,were used to simulate the unidirectional solidification of the single crystal turbine blade. Based on the analysis result,the stress distributing and blade deformation were qualitatively discussed. The result indicates that the max-residual stress presents at the root air-inlets,and the max-residual stress of root air-inlets is 28. 4% higher than that of blade-body. The dynamic change of the temperature and the stress can basically been refle |
| ISSN: | 1005-5053 |
| DOI: | 10.11868/j.issn.1005-5053.2014.000107 |