摘要
对某离心压缩机模型级6种不同的叶顶间隙形态的流场进行了数值模拟,分析了叶顶间隙形态对离心压缩机模型级整级气动性能的影响,详细分析了不同间隙形态内部的流动结构。研究结果表明:由于叶顶间隙的存在,在整个工况范围内级压比,多变效率,能量头相比无间隙时都有较大幅度下降,特别在大流量区下降更加明显,而且不同的间隙形态对级性能的影响也不同,与无间隙相比间隙1在设计工况点压比下降1.77%,多变效率下降0.65%,能量头下降3.08%,间隙4在设计工况点压比下降4.38%,多变效率下降2.41%,能量头下降7.08%,而间隙2,3,5,6的间隙值在间隙1和间隙4之间,其整级气动性能也介于间隙1和间隙4之间,其中间隙3和间隙5的整级气动性能要优于间隙2和间隙6。
The 3D viscous flow in six different tip clearance shapes of a centrifugal compressor stage was studied by numerical simulation. The influence of tip clearance shapes on aerodynamic performance of centrifugal compressor stage was analyzed. The results show that in comparison with no tip clearance, the stage pressure ratio, polytropic efficiency and head coefficient have degraded in whole centrifugal compressor stage operating range because of the tip clearance, especially in large flow condition. The different tip clearance shapes have different influence on aerodynamic performance of centrifugal compressor. In tip clearance 1, the stage pressure ratio, polytropie efficiency and head coefficient have respectively decreased 1.77, 0.65, 3.08 percent compared with no tip clearance. In tip clearance 4, the stage pressure ratio, polytropic efficiency and head coefficient have respectively decreased 4.38, 2.41, 7.08 percent compared with no tip clearance. The aerodynamic performance of tip clearance 3, 5 is better than that of tip clearance 2, 6.
出处
《流体机械》
CSCD
北大核心
2011年第5期20-25,共6页
Fluid Machinery
关键词
离心压缩机
叶顶间隙形态
气动性能
centrifugal compressor
tip clearance shapes
aerodynamic performance
