Hub Flow Near-Wake Validation Using CREATETM-AV Helios and UMD Mercury Framework

IF 1.4 4区工程技术 Q2 ENGINEERING, AEROSPACE

Journal of the American Helicopter Society Pub Date : 2021-05-10 DOI:10.4050/jahs.68.012009

Bumseok Lee, Y. Jung, J. Baeder, M. Potsdam

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Abstract

Experimental near-wake flow field measurements from two Penn State University water tunnel tests of a defeatured helicopter hub are compared with two unsteady computational fluid dynamics (CFD) analyses: CREATETM-AV Helios and the University of Maryland Mercury. Both CFD frameworks employ an unstructured/Cartesian multimesh paradigm and turbulent Spalart–Allmaras detached eddy simulation (SA-DES) modeling. Experimental velocimetry measurements of mean wake velocities, harmonic content, and Reynolds stresses provide valuable validation data for CFD. Overall, the two CFD solvers were in good agreement with each other and qualitatively captured the mean and harmonic content of the wake structures with accuracy. Flow feature dissimilarities between the advancing and retreating sides were differentiated and indicated dominant regions of harmonic flow disturbances biased towards the retreating side, in good agreement with experimental observations. Quantitatively, some variation in velocity deficits and downwash were noted, either in profile character, magnitude, and/or location. Encouragingly, there was little tendency of excessive dissipation in the CFD near wake, and the harmonic content actually tended towards a common overprediction. Reynolds number effects were minimal, and grid density effects were studied but inconclusive. These efforts were part of the Third PSU Rotor Hub Flow Workshop in 2020.

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使用CREATETM-AV Helios和UMD Mercury框架的枢纽流近尾流验证

宾夕法尼亚州立大学对一个改造后的直升机轮毂进行的两次风洞试验的实验近尾流流场测量结果与两次非定常计算流体动力学（CFD）分析进行了比较：CREATETM-AV Helios和马里兰大学Mercury。两种CFD框架均采用非结构化/笛卡尔多网格范式和湍流Spalart–Allmaras分离涡模拟（SA-DES）建模。平均尾流速度、谐波含量和雷诺应力的实验测速测量为CFD提供了有价值的验证数据。总的来说，两个CFD求解器彼此一致，并准确地定性捕捉了尾流结构的平均和谐波含量。区分了前进侧和后退侧之间的流动特征差异，表明谐波流动扰动的主导区域偏向后退侧，与实验观测结果非常一致。定量地说，在剖面特征、震级和/或位置上，注意到了速度不足和下洗的一些变化。令人鼓舞的是，在尾流附近的CFD中几乎没有过度耗散的趋势，谐波含量实际上倾向于常见的过度预测。雷诺数效应很小，对网格密度效应进行了研究，但没有结论。这些工作是2020年第三届PSU转子轮毂流量研讨会的一部分。

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来源期刊

Journal of the American Helicopter Society 工程技术-工程：宇航

CiteScore

4.10

自引率

33.30%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of the American Helicopter Society is a peer-reviewed technical journal published quarterly (January, April, July and October) by AHS — The Vertical Flight Society. It is the world''s only scientific journal dedicated to vertical flight technology and is available in print and online. The Journal publishes original technical papers dealing with theory and practice of vertical flight. The Journal seeks to foster the exchange of significant new ideas and information about helicopters and V/STOL aircraft. The scope of the Journal covers the full range of research, analysis, design, manufacturing, test, operations, and support. A constantly growing list of specialty areas is included within that scope. These range from the classical specialties like aerodynamic, dynamics and structures to more recent priorities such as acoustics, materials and signature reduction and to operational issues such as design criteria, safety and reliability. (Note: semi- and nontechnical articles of more general interest reporting current events or experiences should be sent to the VFS magazine