Structural modeling and validation of an active twist model rotor blade

Hoffmann, Frauke; Keimer, Ralf; Riemenschneider, Johannes

doi:10.1007/s13272-015-0173-0

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…Therein, the dynamic stress intensity of the blade is mainly affected by blade vibration characteristics and unsteady airflow exciting force [11,12]. Hoffmann et al [13] applied the finite element method to compute self-vibration frequencies and vibration modes of blades, wherein computation programs included DLR's rotor simulation code S4 and ANSYS. Then, experimental methods were used to measure self-vibration frequency of the blade at different orders under nonrotation and rotation states, wherein the effectiveness of numerical modeling was verified.…”

Section: Introductionmentioning

confidence: 99%

Axial Spacing Effects on Rotor-Rotor Interaction Noise and Vibration in a Contra-Rotating Fan

Luan

Weng

Liu

et al. 2019

International Journal of Aerospace Engineering

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Because of the potential technical advantages, the contra-rotation technology has become a renewed interest in aviation and other applications. Contra-rotation increases efficiency in comparison with the single-rotor design, but this advantage is not fully harnessed. The axial spacing of two-stage contra-rotating blade rows has a significant impact on a contra-rotating fan/compressor. The results show that with a contra-rotation pattern, the strong unsteadiness of two-stage rotors is caused by the rotor-rotor interaction. The unsteadiness of rotor 1 is caused by the potential disturbance, and the upstream wake leads to the strong unsteadiness of rotor 2. With the increase of axial spacing, the rotor-rotor interaction is weakened, while unsteady features of two-stage rotor blades tend to be consistent. The acoustic and vibration effects of axial spacing are studied. It is found that the axial spacing has great influence of aerodynamic noise. The mean value of sound pressure level decreases by 17.2 dB in total when the axial spacing increased to 1.1 chord from 0.3 chord. For the accuracy of calculation, the scattering effect of the casing wall should be considered in the prediction of the noise. The axial spacing does not have obvious effects on the natural frequencies of the two-stage rotor blades but has certain effect on blade deformation.

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Section: Introductionmentioning

confidence: 99%

Axial Spacing Effects on Rotor-Rotor Interaction Noise and Vibration in a Contra-Rotating Fan

Luan

Weng

Liu

et al. 2019

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

show abstract

Blade tip vortex measurements on actively twisted rotor blades

et al. 2017

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New smart twisting active rotor (STAR): pretest predictions

van der Wall,

Lim,

Riemenschneider

et al. 2024

CEAS Aeronaut J

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A Mach-scaled model rotor with an active twist capability is in preparation for a wind tunnel test in the large low-speed facility of the German-Dutch wind tunnel (DNW) with international participation by the German Aerospace Center (DLR), US Army Combat Capabilities Development Command (DEVCOM) Aviation & Missile Center, National Aeronautics and Space Administration, French Aerospace Lab (ONERA), Korea Aerospace Research Institute, Konkuk University, Japan Aerospace Exploration Agency, Glasgow University, and DNW. To get the maximum benefit from the test and the most valuable data within the available test time, the tentative test matrix was covered by predictions of the partners, active twist benefits were evaluated, and support was provided to the test team to focus on the key operational conditions.

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Structural modeling and validation of an active twist model rotor blade

Cited by 3 publications

References 3 publications

Axial Spacing Effects on Rotor-Rotor Interaction Noise and Vibration in a Contra-Rotating Fan

Axial Spacing Effects on Rotor-Rotor Interaction Noise and Vibration in a Contra-Rotating Fan

Blade tip vortex measurements on actively twisted rotor blades

New smart twisting active rotor (STAR): pretest predictions

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