A micro surface fence probe for the application in flow reversal areas

Papen, Tilmann von; Steffes, H.; Ngo, Ha-Duong; Obermeier, Ε.

doi:10.1016/s0924-4247(01)00873-1

Cited by 24 publications

(10 citation statements)

References 8 publications

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“…Several methods such as wall-wire measurements [ 9 ], diverse micro-cantilevers or the assessment of the wall-shear stress from near-wall micro-Particle-Image Velocimetry ( μ PIV) measurements [ 10 ] have been proposed to indirectly measure the wall-shear stress by applying its relation to the near-wall velocity gradient. Static sublayer surface fences have been used to measure mean surface skin friction in turbulent flows, for which the shear stress is taken to be proportional to a pressure drop ∂ p /∂ x i across the fence [ 9 , 11 ].…”

Section: General Description Of the Micro-pillar Shear-stress Sensor mentioning

confidence: 99%

The Micro-Pillar Shear-Stress Sensor MPS3 for Turbulent Flow

Große

Schröder

2009

Sensors

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Wall-shear stress results from the relative motion of a fluid over a body surface as a consequence of the no-slip condition of the fluid in the vicinity of the wall. To determine the two-dimensional wall-shear stress distribution is of utter importance in theoretical and applied turbulence research. In this article, characteristics of the Micro-Pillar Shear-Stress Sensor MPS3, which has been shown to offer the potential to measure the two-directional dynamic wall-shear stress distribution in turbulent flows, will be summarized. After a brief general description of the sensor concept, material characteristics, possible sensor-structure related error sources, various sensitivity and distinct sensor performance aspects will be addressed. Especially, pressure-sensitivity related aspects will be discussed. This discussion will serve as ‘design rules’ for possible new fields of applications of the sensor technology.

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Section: General Description Of the Micro-pillar Shear-stress Sensor mentioning

confidence: 99%

The Micro-Pillar Shear-Stress Sensor MPS3 for Turbulent Flow

Große

Schröder

2009

Sensors

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“…Unfortunately, details on the flow calibration are not provided other than to state the calibration was conducted in a known flow in a reference wind tunnel. [8][9][10][11] An important consideration in the use and design of any device based on an obstruction to the flow is for it not to alter the flow field. These type devices have similar issues with the validity of a calibration extending to the actual use of the sensor.…”

Section: American Institute Of Aeronautics and Astronauticsmentioning

confidence: 99%

The Need for a Shear Stress Calibration Standard (Invited)

Scott

2004

24th AIAA Aerodynamic Measurement Technology and Ground Testing Conference

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By surveying current research of various micro-electro mechanical systems (MEMS) shear stress sensor development efforts we illustrate the wide variety of methods used to test and characterize these sensors. The different methods of testing these sensors make comparison of results difficult in some cases, and also this comparison is further complicated by the different formats used in reporting the results of these tests. The fact that making these comparisons can be so difficult at times clearly illustrates a need for standardized testing and reporting methodologies. This need indicates that the development of a national or international standard for the calibration of MEMS shear stress sensors should be undertaken. As a first step towards the development of this standard, two types of devices are compared and contrasted. The first type device is a laminar flow channel with two different versions considered: the first built with standard manufacturing techniques and the second with advanced precision manufacturing techniques. The second type of device is a new concept for creating a known shear stress consisting of a rotating wheel with the sensor mounted tangentially to the rim and positioned in close proximity to the rim. The shear stress generated by the flow at the sensor position is simply τ = µ rω /h, where µ is the viscosity of the ambient gas, r the wheel radius, ω the angular velocity of the wheel, and h the

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“…This implicit measuring technique is able to provide directional information of the adjacent mean wall shear stress and its absolute value. The measurement principle was first introduced by Patel (1965) and later adopted on the basis of micro-electro-mechanical systems (MEMS) (Von Papen et al 2002;Schober et al 2004). The present work utilizes this method in an annular compressor rig demonstrating its capabilities in general turbomachinery applications.…”

Section: Introductionmentioning

confidence: 99%

Advanced application of a sublayer fence probe in highly instationary turbomachinery flows: observations on prestall instabilities

Eck¹,

Rückert²,

Peitsch³

2019

Exp Fluids

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The present paper introduces a novel approach for measuring near wall flow velocities by utilizing a sublayer surface fence probe. Hereby, a difference in static pressure builds up over a microscopic obstacle within the viscous sublayer. An analytical model of the angular dependent pressure difference is employed to derive information about the flow direction. Furthermore, a computational preston tube approach has been used to calibrate the surface fence probe with regard to a flow velocity to be assigned to half of the fence height. Through the use of a sophisticated analyzing algorithm the flow direction and its velocity can be determined as a function of time. As a proof of concept measurements were conducted within the radial gap of an annular compressor rig yielding both mean and time resolved near wall flow fields. Former are in very good compliance with oil flow visualizations proving the methods accuracy. The experimental results give unprecedented insights into an unsteady flow phenomenon that arises when an axial compressor is operating close to its stalling limit. The presented technique allows for investigating turbomachinery areas which formerly were observable only by computational means.

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A micro surface fence probe for the application in flow reversal areas

Cited by 24 publications

References 8 publications

The Micro-Pillar Shear-Stress Sensor MPS3 for Turbulent Flow

The Micro-Pillar Shear-Stress Sensor MPS3 for Turbulent Flow

The Need for a Shear Stress Calibration Standard (Invited)

Advanced application of a sublayer fence probe in highly instationary turbomachinery flows: observations on prestall instabilities

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