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数值模拟技术在制备燃气轮机叶片中的应用

ISSN号：1001-2249
期刊名称：《特种铸造及有色合金》
时间：0
分类：TG249.5[机械工程—精密仪器及机械;金属学及工艺—铸造] TP311[自动化与计算机技术—计算机软件与理论;自动化与计算机技术—计算机科学与技术]
作者机构：清华大学材料学院先进成形制造教育部重点实验室,北京100084
相关基金：国家重点基础研究发展计划（973计划）资助项目（2011CB706801）; 国家自然科学基金资助项目（51171089,51374137）; 国家科技重大专项资助项目（2012ZX04012-011,2011ZX04014-052,2009ZX04006-041）

关键词：燃气轮机叶片, 数值模拟, 定向凝固, Gas Turbine Blades, Numerical Simulation, Directional Solidification

中文摘要：

从单晶叶片的选晶过程、HRS定向凝固工艺制备航空叶片及LMC工艺制备重型燃气轮机叶片3方面,简要介绍了数值模拟技术的研究进展。描述了数理模型的建立,对比分析了两种不同的定向凝固工艺的优缺点。螺旋选晶器的设计对单晶叶片的制备影响较大,其设计失效可能会导致选晶效率差,出现杂晶缺陷等。通过对航空叶片温度场及微观组织的模拟,结合试验研究,优化了工艺,成功制备出单晶叶片。重型燃气轮机叶片制备更为复杂,通过数值模拟缩短了研发周期,节约了成本。

英文摘要：

The research progress of numerical simulation technique with respect to grain selection,aeroengine turbine blades manufactured by HRS directional solidification method and industrial gas turbine（IGT）blades manufactured by LMC method was introduced,respectively.The mathematical and physical model of these two directional solidification processes was described,and the merits and dis-merits of them were analyzed comparatively.To a great extent,the quality of single crystal blades depends on the geometrical structure of spiral selector.The invalidation of selector design may decrease the selecting efficiency and lead to stray grains.The process for producing single crystal blades was optimized by means of the simulation of temperature field and microstructure.Moreover,the more complex process for producing IGT blades was simulated to reduce RD cycle and save the cost.

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