不同湍流模型在斜流泵性能预测中的应用

发布时间：2018-05-20 02:43

本文选题：湍流模型 + 斜流泵　；参考：《水电能源科学》2017年06期

【摘要】：为研究不同湍流模型在斜流泵性能模拟上的差异,以比转速为425的斜流泵为研究对象,选取κ-ε、κ-ω、SST、RNGκ-ε四种湍流模型,对斜流泵设计工况下的内部流动进行数值计算,并分析各湍流模型在斜流泵内流计算中的适用性。结果表明,SST模型预测的扬程偏差较大,为7.69%,其余模型扬程预测偏差均小于5%,其中RNGκ-ε模型扬程预测偏差最小,为3.76%;SST模型预测的效率偏差最大,为3.70%,κ-ε模型和κ-ω模型的效率偏差最小,均为3.00%;4种模型在吸入段及导叶处的轴向速度分布基本一致,κ-ω模型对叶轮轴向速度预测的高速域范围略优于其余三种模型;κ-ε模型和RNGκ-ε模型对斜流泵涡量预测结果较为相似,而κ-ω模型和SST模型的预测结果比较接近。研究结果可为预测斜流泵性能和内部流动特性提供参考。
[Abstract]:In order to study the difference of different turbulence models in the performance simulation of slant flow pump, taking the slant flow pump with 425 specific speed as the research object, four turbulence models, 魏-蔚, 魏-蠅 SSTN RNG 魏-蔚, are selected to calculate the internal flow under the design condition of the slant flow pump. The applicability of each turbulence model in the calculation of the internal flow of the oblique flow pump is analyzed. The results showed that the head deviation of RNG 魏-蔚 model was lower than that of RNG 魏-蔚 model, and the maximum of efficiency deviation was 3.70%, and the minimum deviation of 魏-蔚 model and 魏-蠅 model was found in the other models, and the results showed that the head deviation of the model was 7.69%, and that of the other models was less than 5%, and that of the RNG 魏-蔚 model was the smallest, which was the maximum of the efficiency deviation of the 3.76 SST model. The axial velocity distributions of the four models are basically the same in the suction section and the guide vane, the speed range of 魏-蠅 model for impeller axial velocity prediction is slightly better than the other three models, and the results of 魏-蔚 model and RNG 魏-蔚 model for predicting vorticity of oblique flow pump are similar. The results of 魏-蠅 model and SST model are similar. The results can provide a reference for predicting the performance and internal flow characteristics of oblique flow pumps.
【作者单位】：江苏大学流体机械工程技术研究中心;
【基金】：国家自然科学基金项目(51309119) 江苏省成果转化项目(BA2013127) 江苏省产学研项目(BY2014123-07) 江苏高校优势学科建设工程资助项目(PAPD)
【分类号】：TH31

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