A Test Case for the Numerical Investigation of Wake Passing Effects on a Highly Loaded LP Turbine Cascade Blade
A Test Case for the Numerical Investigation of Wake Passing Effects on a Highly Loaded LP Turbine Cascade Blade
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DOI：
10.1115/2001-gt-0311
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发表时间：
2001-06
期刊：
影响因子：
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通讯作者：
P. Stadtmüller;L. Fottner
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文献类型：
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作者：
P. Stadtmüller;L. Fottner
本文介绍了一组高负荷低压涡轮机叶栅上尾流诱导转捩效应的实验数据，这些数据将用于进一步的数值计算工作。虽然基本物理尚未完全理解，但尾流通过的好处已经知道并用于现代燃气轮机的设计过程中。为了进一步优化，下一步似乎是现在启用足够详细的数值模拟，以捕获主要影响，同时尽可能简单，同时具有成本效益。本系统研究中的实验结果可供下载，并应作为未来不同湍流和转捩模型计算的基本数据集，因此，对于尾流诱导转捩过程的适当数值处理所需的复杂性和建模，给出了一些解释。本试验案例中介绍的数据是使用称为T106 D的涡轮机叶栅获得的。与设计点条件相比，EIZ具有增加的叶片桨距，以实现更高的负载。在吸力面形成一个大的分离气泡，可以非常详细地研究附面层的发展。上游叶栅采用动杆式尾流发生器模拟。测量包括叶栅进口平面内的杆尾流特性的热线数据（速度差和湍流度）、在不同位置用表面安装的热膜传感器和热线探针进行的边界层调查以及总压损失系数的测量。非定常压力传感器被嵌入叶栅叶片的吸力面和尾流耙中，以解决随时间的局部压力分布。它们产生的定量值很容易媲美的数值模拟的输出。本文的目的是使和邀请感兴趣的研究人员验证他们的代码的数据集。从广泛的测试计划中，选择了数量非常有限的操作点来集中工作。标准化数据文件包括一个出口雷诺数为200.000和出口马赫数为0.4的“参考”情况，以及两个较高马赫数或较低雷诺数的点，用于恒定的尾流通过频率和背景湍流水平。
The paper presents a compilation of experimental data on the effects of wake-induced transition on a highly loaded LP turbine cascade intended to be used for further numerical work. Although the underlying physics is not yet completely understood, the benefits of wake passing are already known and employed in the design process of modern gas turbines. For further optimizations, the next step seems to be now to enable numerical simulations detailed enough to capture the major effects while being as uncomplicated as possible at the same time to be cost-effective. The experimental results constituted in this systematic investigation are available for download and should serve as a basic data set for future calculations with different turbulence and transition models, thereby shedding some light on the complexity and modeling required for a suitable numerical treatment of the wake-induced transition process.The data introduced in this test case was acquired using a turbine cascade called T106D-EIZ with increased blade pitch compared to design point conditions in order to achieve a higher loading. A large separation bubble forms on the suction side and allows to study boundary layer development in great detail. The upstream blade row was simulated by a moving bar type wake generator. The measurements comprise hot wire data of the bar wake characteristics in the cascade inlet plane (velocity deficit and turbulence level), boundary layer surveys with surface-mounted hot films sensors and a hot wire probe at various locations and measurements of the total pressure loss coefficient. Unsteady pressure transducers are embedded into the suction side of a cascade blade and in a wake rake to resolve the local pressure distributions over time. They yield quantitative values easily comparable to the output of numerical simulations.The objective of this paper is to enable and to invite interested researchers to validate their code on the data set. From the extensive test program, a very limited number of operating points have been selected to focus the work. The standardized data files include a “reference” case with an exit Reynolds number of 200.000 and an exit Mach number of 0.4 as well as two points with higher Mach or lower Reynolds number for constant wake passing frequencies and background turbulence levels.Copyright © 2001 by ASME