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此文使用ANSYS CFX 11.0软件,采用RANS框架下的多种湍流模型对设计和非设计工况下离心叶轮内部流动进行了数值模拟。对数值模拟结果进行了如下分析:(1)与PIV试验及大涡模拟(LES)所得的流动图案进行对比。(2)对不同网格下计算得到的断面流动参数轮廓进行分析。(3)使用通用理查德森外推法,针对标准k-ε模型,在设计及非设计工况下,对离心叶轮设计及非设计工况扬程及轴功率的预测结果进行了验证和确认。研究结果表明标准k-ε模型能够较好地在设计工况下预测离心叶轮内部流动结构,并能准确有效地预测外特性,然而在非设计工况时由于模型误差导致计算结果较差。
This article uses ANSYS CFX 11.0 software, using a variety of turbulence models under the RANS framework to simulate the internal flow of centrifugal impeller in design and non-design conditions. The numerical simulation results are analyzed as follows: (1) Compared with the flow pattern obtained from PIV test and LES. (2) Analyze the cross-sectional flow profile calculated under different grids. (3) The common Richardson extrapolation method is used to verify and confirm the predictions of centrifugal impeller design and non-design conditions of head and shaft power for the standard k-ε model under design and non-design conditions . The results show that the standard k-ε model can predict the internal flow structure of centrifugal impeller well under design conditions and predict the external characteristics accurately and effectively. However, the calculation results are poor due to model errors in non-designed conditions.