摘要
超临界二氧化碳(S-CO_(2))的真实气体特性使得开展S-CO_(2)离心压缩机的三维数值模拟难以获得稳定的收敛结果,同时,数值计算的时间成本进一步增加了压缩机设计优化的难度。对此,本文首先对压缩机开展三维数值模拟,得到流场信息及对应的损失分布,然后在传统流线曲率法中叠加一维损失模型,并沿流线分段计算CO_(2)压缩因子,以此反映真实气体的压缩过程,建立适用于S-CO_(2)离心压缩机的通流计算方法。将通流计算结果与三维数值模拟结果进行对比后发现:流线曲率法得到的子午面相对速度场分布和焓分布与计算流体动力学(computational fluid dynamics,CFD)结果基本一致;叶片出口温压数据与CFD结果接近,误差分别为0.23%和1.08%,总静等熵效率相差1.5%。结果表明,采用流线曲率法的通流计算可以快速获得较准确的S-CO_(2)离心压缩机叶轮性能参数。
The real gas characteristics of supercritical carbon dioxide(S-CO_(2))make it difficult to obtain stable convergence results in three-dimensional numerical simulation of S-CO_(2) centrifugal compressor,and the time cost of numerical calculation further increases the difficulty of compressor design optimization.To establish a flow calculation method suitable for S-CO_(2) centrifugal compressor,three-dimensional numerical simulation is carried out on the compressor to obtain the flow field information and corresponding loss distribution.Then,the onedimensional loss model is superimposed in the conventional flow line curvature method,and the CO_(2) compression factor is calculated in segments along the flow line,thus to reflect the real gas compression process.Comparison between the calculation results and the three-dimensional numerical simulation results shows that,the distribution of meridian relative velocity field and enthalpy obtained by streamline curvature method are consistent with the computational Fluid dynamics(CFD)results.The temperature and pressure data at the blade outlet are close to the CFD results,with errors of 0.23%and 1.08%,respectively,and a difference of 1.5%in total static isentropic efficiency.The results indicate that the performance parameters of S-CO_(2) centrifugal compressor impeller can be obtained quickly and accurately by using streamline curvature method.
作者
戎毅
廖凯龙
孙恩慧
王立志
RONG Yi;LIAO Kailong;SUN Enhui;WANG Lizhi(Yangzhou Collaborative Innovation Research Institute of Shenyang Aircraft Design and Research Institute Co.,Ltd.,Yangzhou 225111,China;Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization(North China Electric Power University),Beijing 102206,China)
出处
《热力发电》
CAS
CSCD
北大核心
2024年第2期124-132,共9页
Thermal Power Generation
基金
国家自然科学基金项目(52206010)。
关键词
离心压缩机
流线曲率法
损失模型
性能预测
centrifugal compressor
streamline curvature method
loss model
performance prediction
