Development of a PVDF Piezo-Film Sensor Array for Unsteady Wall-Pressure Measurements in a Turbulent SBLI

Corsi, Cosimo; Rohlfs, Lennart; Weiss, Julien; Wang, Bei; Kahf, Maria; Obloch, Pascal; Ngo, Ha-Duong

doi:10.2514/6.2022-4135

Cited by 3 publications

(4 citation statements)

References 32 publications

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“…They have been patterned using different methods (laser etching, wet etching, milling and additive using screen printing) to form small electrodes for the piezoelectric sensors. The figure below shows the sensor array foil schematically [12][13] [14]. For sensor integration we use four system concepts in this project.…”

Section: Sensor Array Conceptmentioning

confidence: 99%

“…In the second concept, the sensor foil is laminated on the surface of the test body in WTT (Wind Tunnel Test). a) 3D sensor concept using PCB [12] b) 3D concept using PET as carrier c) Concept using gluing method to integrate sensor foil on test body d) Concept using additive method to print PVDF and metal features / electrodes It has to be mentioned here, that the conducting lines have to be optimized further as they are contributing noises. It could be also implemented as shielding layer to reduce the signal noise.…”

Section: Sensor Array Conceptmentioning

confidence: 99%

“…The experimental investigations was carried out in the supersonic wind tunnel at the Chair of Aerodynamics of Technische Universität Berlin. A schematic representation is shown in figure 6 [12]. The tunnel has continuous indraft operation: the air is sucked in by a centrifugal compressor, driven up to 16 000 rpm by a 400 kW electric DC motor, it goes through a heated drying chamber in the basement of the laboratory , and after passing past the settling chamber and screens, to reduce the turbulence level, it gets inside the test section, which is composed of a Mach 2 supersonic nozzle and a shock generator responsible for generating an incident SBLI with the (turbulent) floor boundary layer.…”

Section: Measurement and Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

PVDF Sensor Arrays for Applications in Aerospace

Duong Ngo,

Wang,

Pang

et al. 2023

10th ECCOMAS Thematic Conference on Smart Structures and Materials

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The development of the next generation of engines, specifically the Geared Turbofan Engine (GTF Engine), presents a significant challenge. One of the key objectives is to provide a stable flow over the entire range, including at the edges, in order to achieve an 11% reduction in fuel burn. This objective is aligned with the EU's climate-neutral aviation Clean Sky 2 program [1], which aims to reduce CO2 and noise emissions by approximately 30% by the year 2030. To achieve this, it is necessary to optimize the aircraft structure to reduce internal and external noise generated by TBL pressure fluctuations. This requires high fidelity characterization of the wall pressure spectrum in spatial wavenumber space and in temporal frequency. Existing sensor solutions, such as bulky and expensive semiconductor-based pressure sensors, do not meet all the requirements. To address this limitation, a new highperformance wall-mounted sensor array for surface unsteady pressure and wall shear stress measurements has been developed. This new sensor array overcomes the limitations of existing solutions by providing more information about the interactions, as well as improved resolution and frequency domain capabilities. This will enable the development of more efficient and environmentally friendly aircraft engines.

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Section: Sensor Array Conceptmentioning

confidence: 99%

Section: Sensor Array Conceptmentioning

confidence: 99%

Section: Measurement and Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

PVDF Sensor Arrays for Applications in Aerospace

Duong Ngo,

Wang,

Pang

et al. 2023

10th ECCOMAS Thematic Conference on Smart Structures and Materials

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“…Existing sensor solutions in practice do not meet all the requirements. Up to now, bulky and expensive semiconductor-based pressure sensors such as silicon-based piezoresistive sensor solutions from company Kulite have been used [2]. They do not provide enough information about the interactions, and show limitations in resolution and frequence domain.…”

Section: Background / Motivationmentioning

confidence: 99%

P42 - PVDF Sensor Array for Unsteady Wall-Pressure Measurements in Shockwave-Boundary Layer Interactions Application

Ngo¹,

Corsi²,

Wang³

et al. 2023

Poster

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This paper presents the development and 3D integration of a PVDF piezo-film sensor array for unsteady wall-pressure measurements in a turbulent SBLI (Shockwave-boundary layer interactions). The sensor array is developed and tested inside the supersonic wind tunnel in an SBLI configuration. The sensor array is large and have no obstacles on the surface. The sensor system has been 3D integrated and no bond wires are needed. With this type of large area sensor array several local pointwise measurements can be taken without disturbing the flow field. The dynamic wall-pressure field of a turbulent SBLI at Mach 2 is measured and displayed. The obtained results show good agreement with other studies present in literature. The PVDF setup is compared with the standard state-of-the-art sensor used for unsteady pressure measurements, a reference piezoresistive transducer, highlighting the good qualities of the proposed sensor.

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Screen-Printed PVDF Piezoelectric Pressure Transducer for Unsteadiness Study of Oblique Shock Wave Boundary Layer Interaction

Wang,

Corsi,

Weiland

et al. 2024

Micromachines

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Shock wave boundary/layer interactions (SWBLIs) are critical in high-speed aerodynamic flows, particularly within supersonic regimes, where unsteady dynamics can induce structural fatigue and degrade vehicle performance. Conventional measurement techniques, such as pressure-sensitive paint (PSP), face limitations in frequency response, calibration complexity, and intrusive instrumentation. Similarly, MEMS-based sensors, like Kulite® sensors, present challenges in terms of intrusiveness, cost, and integration complexity. This study presents a flexible, lightweight polyvinylidene fluoride (PVDF) piezoelectric sensor array designed for high-resolution wall-pressure measurements in SWBLI research. The primary objective is to optimize low-frequency pressure fluctuation detection, addressing SWBLI’s need for accurate, real-time measurements of low-frequency unsteadiness. Fabricated using a double-sided screen-printing technique, this sensor array is low-cost, flexible, and provides stable, high-sensitivity data. Finite Element Method (FEM) simulations indicate that the sensor structure also has potential for high-frequency responses, behaving as a high-pass filter with minimal signal attenuation up to 300 kHz, although the current study’s experimental testing is focused on low-frequency calibration and validation. A custom low-frequency sound pressure setup was used to calibrate the PVDF sensor array, ensuring uniform pressure distribution across sensor elements. Wind tunnel tests at Mach 2 verified the PVDF sensor’s ability to capture pressure fluctuations and unsteady behaviors consistent with those recorded by Kulite sensors. The findings suggest that PVDF sensors are promising alternatives for capturing low-frequency disturbances and intricate flow structures in advanced aerodynamic research, with high-frequency performance to be further explored in future work.

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Development of a PVDF Piezo-Film Sensor Array for Unsteady Wall-Pressure Measurements in a Turbulent SBLI

Cited by 3 publications

References 32 publications

PVDF Sensor Arrays for Applications in Aerospace

PVDF Sensor Arrays for Applications in Aerospace

P42 - PVDF Sensor Array for Unsteady Wall-Pressure Measurements in Shockwave-Boundary Layer Interactions Application

Screen-Printed PVDF Piezoelectric Pressure Transducer for Unsteadiness Study of Oblique Shock Wave Boundary Layer Interaction

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