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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >Investigation of Advanced CFD Methods and their Application to Centrifugal Compressors
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Investigation of Advanced CFD Methods and their Application to Centrifugal Compressors

机译：先进CFD方法的研究及其在离心压缩机中的应用

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摘要

CFD predictions were obtained for components of the last stage of a three-stage centrifugal pipeline booster. An objective was to investigate the dependence of the numerical predictions to such computational factors as mesh size, numerical model and mesh style. A number of impeller-only calculations were performed, and the results presented indicated that the predictions depended strongly on the discretization method, with second order schemes giving superior results to first order methods. Solution dependence on mesh size was also demonstrated. The application of error estimation techniques indicated that reasonable estimates of "mesh-independent" results can be obtained even using relatively coarse meshes. It was also observed that even relatively fine single-passage meshes (250000 nodes) do not yield mesh-independent results, hence it is important for the analyst to take care in comparing solutions for design variations, so that numerical error does not cloud observed changes. In such cases the analyst must take care to use meshes that are consistent in terms of mesh size, arrangement, topology etc. otherwise incorrect conclusions could result. CFD predictions of the flow in a vaneless diffuser-volute configuration were obtained for two styles of mesh: "all-hex" and "hybrid". The results indicated that the two mesh styles yielded comparable flow patterns and comparable predictions of loss coefficient, provided a reasonable level of mesh refinement is used.
机译：获得了三级离心管道增压器最后一级组件的CFD预测。目的是研究数值预测对诸如网格尺寸，数值模型和网格样式等计算因素的依赖性。进行了许多仅叶轮的计算，给出的结果表明，预测很大程度上取决于离散化方法，二阶方案比一阶方法具有更好的结果。还证明了溶液对网眼尺寸的依赖性。误差估计技术的应用表明，即使使用相对粗糙的网格，也可以获得合理的“网格无关”结果估计。还观察到，即使是相对较细的单通道网格（250000个节点）也不会产生与网格无关的结果，因此对于分析人员，在比较设计变化的解决方案时要格外重要，这样数值误差就不会遮盖观察到的变化。 。在这种情况下，分析人员必须小心使用在网格尺寸，排列，拓扑等方面一致的网格，否则可能导致错误的结论。对于两种样式的网格，获得了无叶片扩散器-蜗壳配置中的流的CFD预测：“全六角”和“混合”。结果表明，只要使用合理的网格细化水平，这两种网格样式都可以产生可比的流动模式和可预测的损耗系数预测。

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