Influence of Surface Roughness on Three-Dimensional Separation in Axial Compressors
Influence of Surface Roughness on Three-Dimensional Separation in Axial Compressors
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DOI：
10.1115/1.1791281
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发表时间：
2004-10
影响因子：
1.7
通讯作者：
S. A. Gbadebo;T. Hynes;N. Cumpsty
中科院分区：
文献类型：
--
作者：
S. A. Gbadebo;T. Hynes;N. Cumpsty
静叶表面粗糙度对单级低速轴流压气机轮毂的三维分离有重要影响。分离度随粗糙度的变化使分级性能恶化。进行了初步的研究，以确定定子吸力表面的哪一部分以及在什么操作条件下流动对粗糙度最敏感。结果表明，级性能对前缘和峰值吸力区域周围的表面粗糙度非常敏感，特别是对设计值和较低值对应的流量。表面流动可视化和出口损失测量表明，在展向和弦向范围内，分离的大小随着粗糙度的存在而增加。粗糙度在设计流量系数上产生了较大的三维分离，这在接近失速的光滑叶片中发现。建立了一个简单的模型来模拟粗糙度的影响，并将其纳入三维Navier-Stokes计算方法中，结果表明该模型与测量结果具有良好的定性一致性。
Surface roughness on a stator blade was found to have a major effect on the three-dimensional (3D) separation at the hub of a single-stage low-speed axial compressor. The change in the separation with roughness worsened performance of the stage. A preliminary study was carried out to ascertain which part of the stator suction surface and at what operating condition the flow is most sensitive to roughness. The results show that stage performance is extremely sensitive to surface roughness around the leading edge and peak-suction regions, particularly for flow rates corresponding to design and lower values. Surface flow visualization and exit loss measurements show that the size of the separation, in terms of spanwise and chordwise extent, is increased with roughness present. Roughness produced the large 3D separation at design flow coefficient that is found for smooth blades nearer to stall. A simple model to simulate the effect of roughness was developed and, when included in a 3D Navier-Stokes calculation method, was shown to give good qualitative agreement with measurements.