摘要：We propose the concept of thermal demultiplexer, which can split the heat flux in different frequency ranges intodifferent directions. We demonstrate this device concept in a honeycomb lattice with dangling atoms. From the view ofeffective negative mass, we give a qualitative explanation of how the dangling atoms change the original transport *** first design a two-mass configuration thermal demultiplexer, and find that the heat flux can flow into different ports incorresponding frequency ranges roughly. Then, to improve the performance, we choose the suitable masses of danglingatoms and optimize the four-mass configuration with genetic algorithm. Finally, we give out the optimal configuration witha remarkable effect. Our study finds a way to selectively split spectrum-resolved heat to different ports as phonon splitter,which would provide a new means to manipulate phonons and heat, and to guide the design of phononic thermal devices inthe future.

摘要：为研究特性曲线以及转轮选型对抽水蓄能电站过渡过程的影响,本文基于两套特性曲线进行转轮选型,在得到两套转轮参数后,采用数值模拟方法对两者进行三个典型工况的过渡过程计算。计算结果表明:选取特性曲线时,应尽量采用S特性曲线二区开度线变化斜率较大的特性曲线;转轮选型应当避免采用过大或过小的转轮直径,过小的直径将导致水泵工况无法满足调节保证计算的要求,过大则会使得水轮机工况点靠近S区域;并且特性曲线以及转轮选型对机组相继甩负荷工况的最不利间隔时间及尾水管进口处最小压力有着显著的影响,二区开度线变化斜率较大且转轮直径适中是提高相继甩负荷工况下尾水管进口处最小压力有效设计措施。