Experimental study of fluid-structure interaction at a model wind turbine blade using optical measurement techniques

Kröger, Lars; Wester, Tom T. B.; Langidis, Apostolos; Nietiedt, S.; Göring, Martina; Lühmann, Thomas; Peinke, Joachim; Hölling, Michael; Gülker, Gerd

doi:10.1088/1742-6596/1618/3/032025

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…To prevent the systems from diverging, they are reset to the same timestamp each time the blade passes through. This synchronization of the systems has already proven to be efficient and reliable in previous studies [ Kröger et al (2020); Nietiedt et al (2019)].…”

Section: Methodsmentioning

confidence: 74%

Fluid-Structure Interaction Experiments On A Scaled Model Wind Turbine Under Tailored Inflow Conditions Using PIV And Photogrammetry

Wester

Kröger

Langidis

et al. 2022

LXLASER

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Wind turbines are exposed to a variety of inflow conditions when operating in free field conditions. The inflow velocity can change on the scale of seconds. The resulting effects on the turbine itself are difficult to study due to their complexity and the size of such systems. For this reason, it is of great interest to investigate occurring effects in more detail using scaled experiments under as realistic conditions as possible. However, due to the complexity of such experiments, this remains a major challenge to this day. This study presents wind tunnel experiments on a scaled wind turbine with realistically bending rotor blades. The turbine is subjected to a tailored flow generated by an active grid. To investigate the aerodynamic effects and also the resulting fluid-structure interaction (FSI) of such a flow on the turbine, PIV measurements are performed at different positions of the blade span and additionally the deformation is measured by photogrammetry. This combination of experimental components provides the first holistic insight into the influences of dynamic inflows on a wind turbine.

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Section: Methodsmentioning

confidence: 74%

Fluid-Structure Interaction Experiments On A Scaled Model Wind Turbine Under Tailored Inflow Conditions Using PIV And Photogrammetry

Wester

Kröger

Langidis

et al. 2022

LXLASER

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“…Especially with the development of pulsed lasers and digital high-speed cameras, the frame rate could significantly increase. For example, [30] uses a high-speed stereo PIV system (2D-3C) to analyze dynamic stalls on rotor blades. The use of high-speed cameras allows a frame rate of several kilohertz, so the approach is referred to as time-resolved PIV in literature [31].…”

Section: Flow Measurement Techniquesmentioning

confidence: 99%

A Wind Tunnel Setup for Fluid-Structure Interaction Measurements Using Optical Methods

Nietiedt

Wester

Langidis

et al. 2022

Sensors

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The design of rotor blades is based on information about aerodynamic phenomena. An important one is fluid-structure interaction (FSI) which describes the interaction between a flexible object (rotor blade) and the surrounding fluid (wind). However, the acquisition of FSI is complex, and only a few practical concepts are known. This paper presents a measurement setup to acquire real information about the FSI of rotating wind turbines in wind tunnel experiments. The setup consists of two optical measurement systems to simultaneously record fluid (PIV system) and deformation (photogrammetry system) information in one global coordinate system. Techniques to combine both systems temporally and spatially are discussed in this paper. Furthermore, the successful application is shown by several experiments. Here, different wind conditions are applied. The experiments show that the new setup can acquire high-quality area-based information about fluid and deformation.

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“…A current alternative is photogrammetry, which allows dimensional measurements of large-scale volumes at a lower cost than LT technology and does not require operators to have extensive training. This technology has been used since the 19th century (e.g., mapping), and nowadays, it is very valuable in different sectors such as aeronautics, civil engineering, and manufacturing [10][11][12][13]. The issues related to this method include the absence of a normative foundation to determine the system's accuracy [1] and the lack of models to predict this accuracy.…”

Section: Introductionmentioning

confidence: 99%

Methodology to Evaluate the Performance of Portable Photogrammetry for Large-Volume Metrology

et al. 2022

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The increased relevance of large-volume metrology (LVM) in industrial applications entails certain challenges: measurements must be cost-efficient and the technologies must be easy to use while ensuring accuracy and reliability. Portable photogrammetry shows great potential to overcome such challenges, but industrial users do not yet rely on its accuracy for large scenarios (3 to 64 m), especially when mass-market cameras are not conceived of as industrial metrology instruments. Furthermore, the measurement results might also depend on the operator’s skills and knowledge of the key process variables. In this work, a methodology was designed so that the measurement uncertainty of portable photogrammetry can be evaluated under controlled conditions for LVM. To do so, PTB’s reference wall, which was designed to assess laser-based methods applied to large volumes, was used as a reference artefact to study the measurement performance under different conditions, enabling an analysis of the relative influence of two process variables: the spatial arrangement of the optical instruments on the scene, and the relative camera poses for an accurate triangulation. According to these variables, different measuring conditions were designed (Monte Carlo analysis), and experimentally evaluated and reported (LME, length measuring errors), analysing the performance figures expected from both unskilled and expert users.

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Experimental study of fluid-structure interaction at a model wind turbine blade using optical measurement techniques

Cited by 4 publications

References 4 publications

Fluid-Structure Interaction Experiments On A Scaled Model Wind Turbine Under Tailored Inflow Conditions Using PIV And Photogrammetry

Fluid-Structure Interaction Experiments On A Scaled Model Wind Turbine Under Tailored Inflow Conditions Using PIV And Photogrammetry

A Wind Tunnel Setup for Fluid-Structure Interaction Measurements Using Optical Methods

Methodology to Evaluate the Performance of Portable Photogrammetry for Large-Volume Metrology

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