The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
Home Program Author Index Search

EXPERIMENTAL VERIFICATION OF WALL SHEAR STRESS MEASUREMENT WITH MEMS SENSORS ARRAY FOR UNDERWATER APPLICATIONS WITH FLAT PLATE BENCHMARK TESTS


Go-down ichd2016 Tracking Number 88

Presentation:
Session: Advanced experimental techniques
Room: Room 2
Session start: 10:30 Wed 21 Sep 2016

Tian Yu Kui   tyk702@sina.com
Affifliation:

Shen Xue   sxsnow@qq.com
Affifliation:

Sun Hai Lang   sun.hl@163.com
Affifliation:

Zhang Xuan   zhangxuan0302@126.com
Affifliation:

Xie Hua   xie621@163.com
Affifliation:

Zhang Nan   Zn_nan@sina.com
Affifliation:


Topics: - Advanced experimental techniques

Abstract:

Underwater wall shear stress measurement based on a newly developed MEMS sensors array is experimentally verified by means of a set of flat plate benchmark tests conducted in a precision water flume. The array consisting of 8 MEMS sensors is firstly calibrated in a well defined 2D flow and then flush embeded on the plate surface at the location centred 80% chord to measure WSS directly. The local freestream velocities ranging 0.1m/s to 0.7m/s are adopted for the test cases of naturally developing flow and deliberately stimulated turbulence. The boundary layer profiles of the investigated area upon the plate surface are correspondingly detected with LDV and mean WSS values are extrapolated from suitable fits to known profile shapes for flat plate with a zero pressure gradient. The results from the MEMS sensors match well with those from the LDV velocity profile fits and are in good agreement with empirical estimations with an overall bias less than 5% when compared in combination, as well, the direct simutaneous measurements from multiple sensors on the MEMS array favorably exibit the streamwise variation of the wall-bounded flow. Generally the MEMS sensors array based underwater wall shear stress measurement is characterized of desirable accuracy and spatial resolution for further practical applications.