Optimization of discrete cavities in a centrifugal compressor to enhance operating stability
Optimization of discrete cavities in a centrifugal compressor to enhance operating stability
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DOI：
10.1016/j.ast.2017.05.029
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发表时间：
2017-09
影响因子：
5.6
通讯作者：
Sang-Bum Ma;Kwang‐Yong Kim
中科院分区：
文献类型：
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作者：
Sang-Bum Ma;Kwang‐Yong Kim
为了提高离心压缩机的运行稳定性，在叶轮上游引入离散空腔，并对其进行优化，进一步提高了离心压缩机的运行稳定性。使用商业代码ANSYS-CFX 15.0进行气动分析，以求解具有剪切应力输运湍流模型的三维reynolds -average Navier-Stokes方程。以离心式压缩机失速余量为目标函数，选取与离散空腔形状相关的3个几何参数（空腔口宽度、角度、空腔间轴向距离）作为设计变量。采用拉丁超立方体采样方法对27个设计点组成设计空间，并构建径向基神经网络模型作为目标函数的代理模型。优化结果表明，采用最优离散空腔的离心式压缩机的失速裕度比不含空腔的压缩机提高了15.4%。
In order to improve the operating stability of a centrifugal compressor, discrete cavities are introduced just upstream of the impeller and optimized for further improve the operating stability. Aerodynamic analysis is performed using a commercial code, ANSYS-CFX 15.0, to solve three-dimensional Reynolds-averaged Navier–Stokes equations with a shear stress transport turbulence model. The stall margin of the centrifugal compressor is used as the objective function, and three geometric parameters associated with the shape of the discrete cavities (the width and angle of the cavity port, and the axial distance between cavities) were selected as design variables. The Latin hypercube sampling method is used to compose the design space with 27 design points, and a radial basis neural network model is constructed as a surrogate model of the objective function. The optimization results show that the stall margin of the centrifugal compressor with the optimum discrete cavities is improved by 15.4% compared to the compressor without cavity.