Flex Circuit Sensor Array for Surface Unsteady Pressure Measurements

Leger, Tim; Johnston, David; Wolff, J. Mitch

doi:10.2514/1.9842

Cited by 13 publications

(1 citation statement)

References 5 publications

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“…Subsequently Berns et al [25] employed the MEMS pressure sensors for the timeresolved measurements of the complex unsteady flow field around wall mounted finite cylinder. The use of such miniature sensors for spatially and temporally well resolved pressure measurements on the surface of inlet guide vanes in a transonic compressor has also been reported in the literature [26]. The good spatial and temporal resolutions and the possibility of measuring low surface pressures of few hundred Pascals make MEMS pressure transducers a suitable diagnostic for shock tunnel flow fields.…”

Section: Introductionmentioning

confidence: 93%

Shock tunnel measurements of surface pressures in shock induced separated flow field using MEMS sensor array

Sriram

Ram

Hegde

et al. 2015

Meas. Sci. Technol.

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Characterized not just by high Mach numbers, but also high flow total enthalpies—often accompanied by dissociation and ionization of flowing gas itself—the experimental simulation of hypersonic flows requires impulse facilities like shock tunnels. However, shock tunnel simulation imposes challenges and restrictions on the flow diagnostics, not just because of the possible extreme flow conditions, but also the short run times—typically around 1 ms. The development, calibration and application of fast response MEMS sensors for surface pressure measurements in IISc hypersonic shock tunnel HST-2, with a typical test time of 600 μs, for the complex flow field of strong (impinging) shock boundary layer interaction with separation close to the leading edge, is delineated in this paper. For Mach numbers 5.96 (total enthalpy 1.3 MJ kg−1) and 8.67 (total enthalpy 1.6 MJ kg−1), surface pressures ranging from around 200 Pa to 50 000 Pa, in various regions of the flow field, are measured using the MEMS sensors. The measurements are found to compare well with the measurements using commercial sensors. It was possible to resolve important regions of the flow field involving significant spatial gradients of pressure, with a resolution of 5 data points within 12 mm in each MEMS array, which cannot be achieved with the other commercial sensors. In particular, MEMS sensors enabled the measurement of separation pressure (at Mach 8.67) near the leading edge and the sharply varying pressure in the reattachment zone.

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Section: Introductionmentioning

confidence: 93%