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A k-Omega Turbulence Model for Quasi-Three-Dimensional Turbomachinery Flows

机译:准三维涡轮机械流动的k-Omega湍流模型

摘要

A two-equation k-omega turbulence model has been developed and applied to a quasi-three-dimensional viscous analysis code for blade-to-blade flows in turbomachinery. the code includes the effects of rotation, radius change, and variable stream sheet thickness. The flow equations are given and the explicit runge-Kutta solution scheme is described. the k-omega model equations are also given and the upwind implicit approximate-factorization solution scheme is described. Three cases were calculated: transitional flow over a flat plate, a transonic compressor rotor, and transonic turbine vane with heat transfer. Results were compared to theory, experimental data, and to results using the Baldwin-Lomax turbulence model. The two models compared reasonably well with the data and surprisingly well with each other. Although the k-omega model behaves well numerically and simulates effects of transition, freestream turbulence, and wall roughness, it was not decisively better than the Baldwin-Lomax model for the cases considered here.
机译:已经开发了一个两方程的k-ω湍流模型,并将其应用于准三维粘性分析代码,用于涡轮机械中的叶片到叶片流动。该代码包括旋转,半径变化和可变的流板厚度的影响。给出了流动方程,并描述了显式的Runge-Kutta解决方案。给出了k-ω模型方程,并描述了迎风隐式近似分解方案。计算了三种情况:平板上的过渡流,跨音速压缩机转子和具有传热功能的跨音速涡轮叶片。将结果与理论,实验数据以及使用Baldwin-Lomax湍流模型的结果进行比较。这两个模型与数据进行了合理的比较,并且彼此之间出乎意料的良好。尽管k-omega模型在数值上表现良好,并模拟了过渡,自由流湍流和壁面粗糙度的影响,但在这里考虑的情况下,它并没有比Baldwin-Lomax模型具有决定性的优势。

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  • 作者

    Chima Rodrick V.;

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  • 年度 1995
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