Wall Shear Stress Calorimetric Micro-Sensor Designed for Flow Separation Detection and Active Flow Control

Proceedings

Ghouila-Houri, Cécile¹ 

关键词: MEMS sensors;    wall shear stress sensors;    calorimetric sensors;    flow control;    separation detection;   

DOI  :  10.3390/proceedings1040376

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

This paper presents an efficient and high-sensitive micro-sensor designed for wall shear stress measurement. The main technical application targeted is flow separation detection for closed-loop active flow control. The sensor is a temperature-resistance transducer operating on heat transfer. The device is micro-structured with three substrate-free wires presenting a high aspect ratio, and periodic perpendicular micro-bridges ensuring mechanical toughness and thermal insulation. This design achieves a homogeneous temperature distribution along the wires. Welded on a flexible printed circuit, the sensor is wall-mounted on a wind tunnel. The experiments, conducted in both attached and separated flow configurations, demonstrate the sensor sensitivity to wall shear stress up to 2.4 Pa and the ability of the 3-wires based design to perform flow direction sensing for back-flow detection.

【 授权许可】

CC BY