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首页> 外文期刊>Transactions of the Japan society for aeronautical and space sciences >Use of CFD Analyses to Predict Disk Friction Loss of Centrifugal Compressor Impellers
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Use of CFD Analyses to Predict Disk Friction Loss of Centrifugal Compressor Impellers

机译：使用CFD分析预测离心式压缩机叶轮的盘摩擦损失

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摘要

To improve the total efficiency of centrifugal compressors, it is necessary to reduce disk friction loss, which is expressed as the power loss. In this study, to reduce the disk friction loss due to the effect of axial clearance and surface roughness is analyzed and methods to reduce disk friction loss are proposed. The rotating reference frame technique using a commercial CFD tool (FLUENT) is used for steady-state analysis of the centrifugal compressor. Numerical results of the CFD analysis are compared with theoretical results using established experimental empirical equations. The disk friction loss of the impeller is decreased in line with increments in axial clearance until the axial clearance between the impeller disk and the casing is smaller than the boundary layer thickness. In addition, the disk friction loss of the impeller is increased in line with the increments in surface roughness in a similar pattern as that of existing experimental empirical formulas. The disk friction loss of the impeller is more affected by the surface roughness than the change of the axial clearance. To minimize disk friction loss on the centrifugal compressor impeller, the axial clearance and the theoretical boundary layer thickness should be designed to be the same. The design of the impeller requires careful consideration in order to optimize axial clearance and minimize surface roughness.
机译：为了提高离心压缩机的总效率，有必要减少盘式摩擦损失，该损失表示为功率损失。在这项研究中，为了减少由于轴向间隙和表面粗糙度的影响而引起的盘摩擦损失，分析了减少盘摩擦损失的方法。使用商用CFD工具（FLUENT）的旋转参考系技术用于离心压缩机的稳态分析。使用已建立的实验经验方程，将CFD分析的数值结果与理论结果进行比较。叶轮的盘摩擦损耗随着轴向间隙的增加而减小，直到叶轮盘与壳体之间的轴向间隙小于边界层厚度为止。另外，叶轮的盘式摩擦损失随着表面粗糙度的增加而增加，并且与现有的实验经验公式相似。叶轮的盘式摩擦损失受表面粗糙度的影响大于轴向间隙的变化。为了使离心式压缩机叶轮上的盘摩擦损失最小，轴向间隙和理论边界层厚度应设计为相同。叶轮的设计需要仔细考虑，以优化轴向间隙并最小化表面粗糙度。

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