鲁雪,李孝检,刘彬

• 1:天津大学机械工程学院
• 2:中国航发湖南动力机械研究所

摘要(Abstract)：

自循环机匣处理能够显著提升超临界二氧化碳离心叶轮小流量区域的气动性能，但对大流量工况附近的性能提升不明显。为此，考虑自循环机匣与叶轮关键参数的耦合效应，对机匣几何和叶轮叶片掠角实施耦合优化，实现了叶轮性能的全面提升。耦合优化后叶轮在大流量工况、设计工况及小流量工况下的效率分别提升了3.51%、2.60%、4.43%。耦合优化的扩稳增效机理为：在大流量工况下改善了叶片前缘进口攻角，减小了叶轮内部亚临界区，抑制了冷凝的同时改善了叶轮内部流通能力；设计工况下机匣的抽吸量增大，叶顶附近更多低能流体被移除，改善了叶轮下游流场结构；小流量工况下显著减小了叶轮内部堵塞面积，叶轮流动稳定性增强，同时改善了机匣回流造成的掺混损失，叶轮效率提升。

关键词(KeyWords)： 离心叶轮;超临界二氧化碳;自循环机匣处理;耦合优化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目（12102298）;; 中国博士后科学基金（2021M702443）;; 内燃机燃烧学国家重点实验室开放课题（K2022-09）~~

作者(Author): 鲁雪,李孝检,刘彬

DOI: 10.19666/j.rlfd.202302016

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