Research Papers

Computational Fluid Dynamics and Particle Image Velocimetry Supported Examination of Bidirectional Velocity Probes for Measurements in Flames

[+] Author and Article Information
Nadir Yilmaz

Department of Mechanical Engineering,
New Mexico Institute of Mining and Technology,
Socorro, NM 87810
e-mail: yilmaznadir@yahoo.com

Humberto Bocanegra

Department of Mechanical Engineering,
New Mexico State University,
Las Cruces, NM 88003

Walt Gill

Fire and Aerosol Sciences,
Sandia National Laboratories,
Albuquerque, NM 87123

1Corresponding author.

Manuscript received January 2, 2012; final manuscript received April 10, 2013; published online October 21, 2013. Assoc. Editor: Lili Zheng.

J. Thermal Sci. Eng. Appl 6(1), 011001 (Oct 21, 2013) (6 pages) Paper No: TSEA-12-1002; doi: 10.1115/1.4024795 History: Received January 02, 2012; Revised April 10, 2013

The bidirectional velocity probe has been used in various flames to measure local velocity. The device is based on the pressure difference between a closed forward facing cavity and a closed rearward facing cavity. The probes have been noted to indicate a pressure difference greater than that which would be predicted based on Bernoulli's equation. Each device must be experimentally calibrated in a wind tunnel at similar Reynolds number to determine its “amplification factor.” This study uses PIV, flow visualization and CFD to examine the flow field around the probe, as well as an experimental study which compares various probe configurations for measurement of velocity by pressure differential. The conclusion is that the amplification factor is indeed greater than unity but use of the wind tunnel for calibration is questionable.

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Fig. 1

BDVP design under investigation

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Fig. 2

Measured differential pressure from BDVP and FSPs compared to theoretical pitot-static tube pressure

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Fig. 3

Calculated amplification factors for the BDVP and FSPs

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Fig. 4

Measured upstream cavity pressures compared to measured pitot-static tube stagnation pressures

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Fig. 5

BDVP and H-beam models with laser sheet indicated in green

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Fig. 6

PIV indicated average velocity in the x-direction around the H-beam

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Fig. 7

PIV enlarge average velocity (m/s) in the x-direction for the wake and the downstream cavity of the H-beam

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Fig. 8

PIV indicated average velocity (m/s) in the x-direction around the BDVP and the wake region

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Fig. 9

Streamline indicating flow past the leading edge along the boundary layer (flow is from right to left)

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Fig. 10

CFD velocity (m/s) results for half of H-beam

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Fig. 11

CFD results for pressure (Pa) distribution for half of the H-beam




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