张磊,石赜,舒伟林,杨锐,杨国英,邓清华

• 1:国能国华(北京)电力研究院有限公司
• 2:国家能源集团新能源技术研究院有限公司
• 3:上海汽轮机厂有限公司
• 4:西安交通大学能源与动力工程学院

摘要(Abstract)：

为进一步探究超临界二氧化碳透平内部的损失机制，针对某透平级采用数值方法研究了其流动特性，将静叶与动叶通道内的损失进行分解，定量计算了各项损失大小及其占比，明晰了超临界二氧化碳透平级的损失大小序列。结果表明，超临界二氧化碳介质密度大和透平叶高小导致其隔板密封和叶顶密封的泄漏损失巨大，级负荷为0.93，静叶间隙相对高度为0.012，动叶间隙相对高度为0.010时，泄漏损失占级总损失的38.23%，其中隔板密封泄漏损失占比为21.94%，叶顶密封泄漏损失占比为16.29%。除泄漏损失外：静叶栅通道内，叶片平均最大厚度比弦长为0.33，展弦比为2.07时，型面损失远高于端壁损失和尾迹损失，占级总损失的9.68%；动叶栅通道内，叶片平均最大厚度比弦长为0.28，展弦比为1.73时，型面损失、端壁损失和尾迹损失相差不大，型面损失仍然占比最高，达到级总损失的15.39%；动叶通道内的二次流影响范围更大，导致其端壁损失远高于静叶端壁损失，其壁面附近流体的黏性耗散和马蹄涡、通道涡等造成的二次流损失是端壁损失的主要来源。研究结果可为超临界二氧化碳透平的优化设计提供方向指引和数据支撑。

关键词(KeyWords)： 二氧化碳;透平级;熵产率;流动损失

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金联合基金（U20A20303）;; 国家重点研发计划项目（2017YFB0601804）~~

作者(Author): 张磊,石赜,舒伟林,杨锐,杨国英,邓清华

DOI: 10.19666/j.rlfd.202305063

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