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首页> 外文期刊>International Journal of Heat and Fluid Flow >Contribution to tip leakage loss modeling in radial turbines based on 3D flow analysis and 1D characterization
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Contribution to tip leakage loss modeling in radial turbines based on 3D flow analysis and 1D characterization

机译:基于3D流量分析和1D表征的径向涡轮叶尖泄漏损失建模的贡献

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摘要

The characterization of tip leakage flow plays an important role for one-dimensional loss modeling and design in radial turbine research. Tip leakage losses can be expressed as function of fluid momentum and mass flow passing through the tip gap. Friction-driven flow and contrariwise oriented pressure gradient-driven flow are highly coupled. However, these numbers are mostly unknown and dependent on tip gap geometry and turbine running condition. Based on a commonly used definition of a non-dimensional tip leakage momentum ratio, a novel correlation has been derived. This allows a consistent characterization for variable tip gap sizes over a wide range of operating conditions. The correlation has been validated by means of CFD data with high variety in reduced speed tip gap geometry and expansion ratios. Results of the novel number show significant improvements of quantitative and qualitative results over a wide range of running conditions in comparison to existing correlations. Furthermore, correlations for tip leakage velocities, that can easily be used in one-dimensional models, have been derived. Finally, it has been demonstrated, that the influence of inlet flow momentum on the tip leakage flow can be analyzed with presented correlations.
机译:尖端泄漏流的表征对于径向涡轮研究中的一维损失建模和设计起着重要作用。尖端泄漏损失可以表示为通过尖端间隙的流体动量和质量流量的函数。摩擦驱动的流动与相反方向的压力梯度驱动的流动高度耦合。但是,这些数字大多未知,并且取决于叶尖间隙的几何形状和涡轮机的运行状况。基于无量纲尖端泄漏动量比的常用定义,得出了一种新颖的相关性。这样就可以在很宽的工作条件范围内对各种尖端间隙尺寸进行一致的表征。这种相关性已通过CFD数据进行了验证,这些数据具有多种多样的减速齿顶间隙几何形状和膨胀比。与现有的相关性相比,新数字的结果显示了在各种运行条件下定量和定性结果的显着改善。此外,已经推导出了可以在一维模型中轻松使用的尖端泄漏速度的相关性。最后,已经证明,可以用给出的相关性分析入口流动动量对尖端泄漏流动的影响。

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