摘要
采用时均Ｎ－Ｓ方程、能量方程、连续性方程、理想气体状态方程及考虑压缩性修正的ｋ－ε双方程湍流模式，计算分析了高速离心式压气机半开式叶轮内部流场．在网格构造中将叶顶间隙及叶道作为独立的网格块处理，克服了以往此类研究中关于叶顶间隙流模拟方面的近似处理．计算是在考虑叶顶实际间隙及零间隙近似两种情况下进行，以研究叶顶间隙流对叶轮内部流动的影响．研究结果表明，当精确地模化叶顶间隙流动后，不仅可很好地预示叶轮内部的重要流动特征，而且计算的子午平均速度及相对气流角亦与测量值符合良好．相反，在零间隙的近似处理下，计算结果与实测值相差甚远，特别是在叶轮的后半部分．
The three dimensional turbulent flow in a high speed centrifugal compressor is numerically analyzed using the time averaged N S equation, energy equation, continuity equation, and state equation of idea gas conjunction with the k ε dual equation turbulence model with modification of compressibility. The blade tip gap and the blade passage are handled as two blocks, and the approximation made by many former investigators in the mesh generation is not applied in this study. The leakage flow and its effect on passage flow have been studied by taking the actual tip clearance into consideration. The results show that the flow characteristics such as the formation and development of wakes are not only well predicted qualitatively, but also the quantitaties of the predicted meridional velocities and relative flow angles are remarkably close to the measured data when the actual tip clearance is actually modelled in the calculations. However, the predicted results deviate largely when tip clearance is taken as zero in the calculations.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
1997年第5期91-96,共6页
Journal of Xi'an Jiaotong University
关键词
离心压气机
三维湍流
数值分析
叶轮
流场
湍流
centrifugal compressors three dimensional turbulent leakage flow numerical analysis
