MEMS High Temperature Gradient Sensor for Skin-Friction Measurements in Highly Turbulent Flows

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Ghouila-Houri, Cécile | Talbi, Abdelkrim | Viard, Romain | Gallas, Quentin | Garnier, Eric | Molton, Pascal | Delva, Jerome | Merlen, Alain | Pernod, Philippe

Edité par HAL CCSD ; Institute of Electrical and Electronics Engineers

This article was presented in part at the IEEE Sensors 2019 and in part at the Selected Papers from the IEEE SENSORS 2019 Conference.. International audience. This paper presents and discusses the results obtained with a MEMS (Micro-Electro-Mechanical System) high temperature gradient sensor for time-averaged and fluctuating skin-friction measurements in highly turbulent flows. Designed as a robust wall-mounted suspended hot-wire structure, the micro-sensor was made using conventional microfabrication techniques, compatible with microelectronics for designing integrated smart systems. Successfully implemented into two air wind tunnels, the sensor was tested in a large range of turbulent flows, with mainstream velocities going up to 270 m/s (Mach number of 0.79), which corresponds to the mean velocity of airliner cruise flights. The experiments demonstrated the wide dynamic range of the micro-sensor without reaching its limits. The micro-sensor thereby demonstrated its value for measuring turbulence in aerodynamic applications, being particularly suitable for aeronautics.

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