CAES离心压缩机叶顶间隙非定常流场结构与高效调节研究

作为压缩空气储能(CAES)系统中核心关键部件离心压缩机是依储能过程的频繁启停与变工况运行等特殊需要设计，研究其叶顶间隙流动带来的损失与流道堵塞影响，对离心压缩机高效稳定运行乃至提升CAES系统效率具有重要意义。本项目以MW级CAES系统压缩机及其关键压缩部件半开式离心叶轮作为研究对象，拟采用理论分析、数值模拟和实验研究的综合方式开展叶轮叶顶间隙非定常流动研究，揭示离心压缩机变工况运行下叶顶间隙非定常流场结构与损失机理，并基于所获影响规律与多目标优化算法完成高性能离心压缩机优化设计。最后再采用全局搜索算法寻求CAES高效宽工况最优调节策略。通过比较系统、全面、深入的理论、实验和数值模拟综合方式，探究叶顶间隙非定常流动特性，进而推进半开式离心叶轮设计理论发展，拓宽同类叶轮机械在多领域、多工况下的应用范围，为进一步产业化研究奠定基础。

As the core component of the compressed air energy storage (CAES) system, centrifugal compressor is designed for special requirements that frequent start and stop of the energy storage process and variable operating conditions. The flow losses and blockage introduced by the tip leakage vortex show great influence on the high efficiency and stability of the centrifugal compressor, and even the efficiency of the CAES system. In the project, the semi-open centrifugal impeller of the MW-class compressed air energy storage system is chosen as the research object. A comprehensive method of theoretical analysis, numerical calculation and experimental research will be carried out on the unsteady flow field of the impeller tip clearance, in order to reveal the unsteady flow field structure and loss mechanism in the tip clearance of the compressor under variable operating conditions. And based on the obtained influence relations, the optimal design of high-performance centrifugal compressor and regulation strategy will be constructed to realize a wide CAES operation conditions. Through systematic, comprehensive and in-depth theoretical, numerical simulation and experimental analysis, the design theory and method for semi-open centrifugal impeller - key components of CAES will be carried out, which will lay the foundation for further large-scale design and industrialization, and further promote the development of renewable energy.