Institute of Engineering Thermophysics,Chinese Academy of Sciences;
Graduate School of the Chinese Academy of Sciences,Beijing 100080,China;
Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100080,China;
Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100080,China;
Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100080,China;
counter-rotating turbine; unsteady flow; numerical simulation;