流体机械旋转湍流计算模型研究进展

发布时间：2018-03-26 07:43

本文选题：流体机械　切入点：旋转湍流　出处：《农业机械学报》2016年02期

【摘要】：旋转湍流是泵、水轮机、风力机和压缩机等流体机械中的典型流动现象,其三维随机脉动特性很强,具有逆压梯度高、流线曲率大、壁面影响突出等特点。目前存在多种湍流模型,但都有各自的适用范围,尚不存在一个通用的湍流模型。现有湍流模型在物理和数值方面的预测性能还未达到流体机械实际需求。针对强旋转和大曲率流动,本文阐述了湍流模型的发展。从湍流核心区的高雷诺数流动、近壁区低雷诺数流动和层流到湍流的转捩流动等不同方面,分析了现有湍流模型在流体机械中的适用性。指出了典型湍流模型在求解旋转湍流时存在的问题,探索了针对不同求解目标引用不同湍流模型的有效途径和方法,对湍流模型的发展趋势及湍流模型在流体机械中的应用进行了展望。
[Abstract]:Rotating turbulence is a typical flow phenomenon in fluid machinery such as pumps, turbines, wind turbines and compressors. Its three-dimensional random pulsation is very strong, with high inverse pressure gradient and high streamline curvature. At present, there are many turbulence models, but each has its own scope of application. There is not a universal turbulence model. The physical and numerical prediction performance of the existing turbulence model is not up to the actual demand of fluid machinery. In this paper, the development of turbulence model is described, from the high Reynolds number flow in the turbulent core region, the low Reynolds number flow near the wall and the laminar to turbulent transition flow, etc. The applicability of the existing turbulence models in fluid machinery is analyzed. The problems of the typical turbulence models in solving rotational turbulence are pointed out, and the effective ways and methods to use different turbulence models for different targets are explored. The development trend of turbulence model and the application of turbulence model in fluid machinery are prospected.
【作者单位】：中国农业大学北京市供水管网系统安全与节能工程技术研究中心;
【基金】：国家自然科学基金项目(51139007) “十二五”国家科技支撑计划项目(2015BAD20B01)
【分类号】：TH123

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