邬鸿霏,钟建琳,彭宝营

• 1:北京信息科技大学机电工程学院

摘要(Abstract)：

为解决自由活塞膨胀机的关键部件活塞在高温气体及机械交变载荷下存在的热应力集中、热变形不均及疲劳寿命较低等问题，通过构建几何模型与网格划分，设置流场、热场边界条件，采用热-流-固耦合方法进行有限元分析。结合名义应力法与材料应力-循环次数（stress-number of cycles, S-N）曲线预测疲劳寿命，发现活塞缓冲区与头部问题显著；进而通过设置环槽、将活塞厚度从10 mm增至20 mm、合理去除活塞中部结构等方式进行结构优化。模拟验证结果表明，优化后活塞热应力降低，局部变形得到有效抑制，疲劳寿命提升，自由活塞膨胀机运行稳定性与可靠性增强，为其实际工程高效应用提供有力支撑。

关键词(KeyWords)： 自由活塞膨胀机-直线发电机;活塞;热机耦合;优化设计

Abstract:

Keywords:

基金项目(Foundation): 北京市自然科学基金项目(3192014)

作者(Author): 邬鸿霏,钟建琳,彭宝营

DOI: 10.16508/j.cnki.11-5866/n.2025.04.005

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