Reduced-Order Modeling of Complex Aerodynamic Geometries Using Canonical Shapes

Koukpaizan, Nicholson; Wilks, Aaron L.; Grubb, Amanda L.; Smith, Marilyn J.

doi:10.2514/6.2018-0420

Cited by 2 publications

(1 citation statement)

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“…Most of the data from the additional GTWT tests have not been published, but initial key points are that full scale ReD tests were achieved, measurement and analysis procedures required for proper comparison between numerical and experimental results have been identified, a decrease in the drag force uncertainty has improved numerical-experimental correlations and a more detailed wake characterization has been developed (Schmitz et al, 2017). This work and related efforts have resulted in some significant advancements in numerical efforts related to improvements of the fluid/structure interactions (Quon et al, 2012;Jacobson & Smith, 2018) and reducing computational costs with physics-based reduced order modeling (Prosser & Smith, 2015;Koukpaizan et al 2018aKoukpaizan et al , 2018b. In addition, this collaboration has influenced additional lower Reynolds number water tunnel experiments (Reich et al, 2015;2017;2018) using a 1:17 scaled model similar to that of Reich et al (2014a).…”

Section: Introductionmentioning

confidence: 99%

Characterization of a canonical helicopter hub wake

2018

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The current study investigates the long-age wake behind rotating helicopter hub models composed of geometrically simple, canonical bluff body shapes. The models consisted of a 4-arm rotor mounted on a shaft above a 2-arm (scissor) rotor with all the rotor arms having a rectangular cross-section. The relative phase between the 2-and 4-arm rotors was either 0° (in-phase) or 45° (out-of-phase). The rotors were oriented at zero angle-of-attack and rotated at 30 Hz. Their wakes were measured with particle-image-velocimetry within a water tunnel at a hub diameter based Reynolds number of 820,000 and an advance ratio of 0.2. Mean profiles, fluctuating profiles and spectral analysis using time-series analysis as well as dynamic mode decomposition were used to characterize the wake and identify coherent structures associated with specific frequency content.The canonical geometry produced coherent structures that were consistent with previous results using more complex geometries. It was shown that the dominant structures (2 and 4 times per hub revolution) decay slowly and were not sensitive to the relative phase between the rotors.Conversely, the next strongest structure (6 times per hub revolution) was sensitive to the relative

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