为了确定小规模超临界二氧化碳（SCO2）热力透平的形式及其结构，基于正向设计思路，结合热力学计算、气动分析、数值模拟的方法，对某200 kW级SCO2径流式热力透平进行参数化设计，并对其进行性能与叶片数量的响应分析，对其内部三维速度、温度和压力场进行CFD数值模拟。结果表明：透平结构等熵效率和功率分别为85.54%和214 kW，与实验值比较最大偏差为2.03%，设计结果可靠。当透平结构静叶个数从20增大到32时，效率和功率分别上升5%和下降20%，最佳静叶片数为26；速度在喷嘴通道和喉道处变化明显，温度和压力分布的变化趋势较为相似，都随着流动方向逐渐降低。

In order to determine the form of a smallscale supercritical carbon dioxide (SCO2) thermal turbine and its structure,a 200 kW class SCO2 radial thermal turbine was parametrically designed based on the forward design idea,combined with the methods of thermodynamic calculations,aerodynamic analysis and numerical simulations,and its performance was analyzed in response to the number of blades and its internal threedimensional velocity,temperature and pressure fields by CFD numerical simulations.The results show that the isentropic efficiency and power of the turbine structure are 85.54% and 214 kW respectively,with a maximum deviation of 2.03% from the experimental value,indicating that the design results are reliable.When the number of stator blades of the turbine structure is increased from 20 to 32,the efficiency and power increase by 5% and decrease by 20% respectively,the optimal number of stator blades is 26.The velocity varies significantly at the nozzle channel and throat; the variation trends of temperature and pressure distribution are similar,both gradually decreasing with the flow direction.

TK14