摘要
介绍了一种可用于热声发电的新型旋转机械式声-电转换方式,并针对其中的双向透平开展了数值与实验研究。采用稳定来流与可压缩交变来流相结合的方式,优化设计了一套百瓦级定导流叶片的双向冲击式透平结构,并完成了其在常压下稳定来流工况的输出特性测试,考察了定转速与定负载输出特性变化。实验获得透平最大输出功率为230 W,最大效率为51%(转速4 000 r/min,对应输出功率83 W,流量系数1.9)。将实验与数值计算进行了对比分析,结果表明:二维计算由于未计入叶片旋转速度径向差异以及叶顶泄漏的影响,定量上与实验值存在明显差异,但对系统性能的预测仍具有指导意义。采用三维模型给出了交变流动下的透平性能预测,计算结果与实验结果符合良好。此项工作可为进一步优化与分析交变流动下的双向透平提供指导。
A new type of acoustic-electrical conversion method for thermoacoustic power generation with rotating machinery is introduced. Numerical and experimental studies on a bi-directional turbine were conducted. A 100-Watt turbine with fixed guide vane was optimized and designed under both steady inlet flow and compressible oscillating flow conditions. Its characteristics at constant speed and constant load output under steady air flow and atmospheric pressure were investigated. The maximum shaft power output of the turbine is 230 W, and the maximum turbine efficiency is 51%(with 4 000 r/min rotating speed, 83 W output shaft power and 1.9 flow coefficient). The experimental and numerical results were compared and analyzed, which shows that there is obvious deviation between the 2 D model calculation and experimental results, but the 2 D model still has guiding significance for the prediction of system performance. The 3 D model overcomes the shortage of 2 D model due to taking into account the radial distribution of blade rotation speed and the influence of tip clearance, and matches well with the experimental data. This work may provide a guidance for further optimizing and analyzing the bi-directional impulse turbines in oscillating flow.
作者
刘冬冬
陈燕燕
戴巍
罗二仓
LIU Dong dong;CHEN Yan yan;DAI Wei;LUO Ercang(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190,China;University of Chinese Academy of Sciences, Beijing 100049,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2019年第5期58-66,共9页
Journal of Xi'an Jiaotong University
基金
国家重点研发计划资助项目(2016YFB0901403)
国家自然科学基金资助项目(51606208)
关键词
热声发电
旋转机械式声-电转换
双向冲击式透平
thermoacoustic power generation
rotating mechanical acousto-electric conversion
bi-directional impulse turbine
