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Application of fast-responding pressure-sensitive paint to a hemispherical dome in unsteady transonic flow

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Abstract

The current work focuses on the development and application of fast-responding polymer/ceramic pressure-sensitive paint (PSP) as an advanced surface pressure measurement technique for unsteady flow fields in large-scale wind tunnels. To demonstrate the unsteady PSP technique, the unsteady surface pressure distribution over a hemispherical dome placed in the United States Air Force Research Laboratory’s Trisonic Gasdynamics Facility (TGF) was studied by phase-locking to the characteristic frequency in the flow caused by an unsteady separated shear layer shed from the dome. The wind tunnel was operated at stagnation pressures of 23.92 and 71.84 kPa, with the test section flow at Mach 0.6. Under the two operating conditions, the predominant shear layer frequency was measured to be 272 and 400 Hz, respectively. The quasi-periodic shear layer frequency enabled a phase-averaged method to be employed for capturing the unsteady shock motion on the hemisphere. Unsteady pressure data resulting from this technique are shown to correlate well with measurements acquired by conventional measurement techniques. Measurement uncertainty in the phase-averaging technique will be discussed. To address measurement uncertainties from temperature sensitivity and model movement, a new implementation of an AC-coupled data representation is offered.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, The Ohio State University, 2300 West Case Road, Columbus, OH, 43235, USA

    Shuo Fang, Kevin J. Disotell, Samuel R. Long & James W. Gregory

  2. U.S. Air Force Research Laboratory, Wright-Patterson AFB, Dayton, OH, 45433, USA

    Frank C. Semmelmayer & Robert W. Guyton

Authors
  1. Shuo Fang
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  2. Kevin J. Disotell
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  3. Samuel R. Long
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  4. James W. Gregory
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  5. Frank C. Semmelmayer
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  6. Robert W. Guyton
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Correspondence to James W. Gregory.

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Fang, S., Disotell, K.J., Long, S.R. et al. Application of fast-responding pressure-sensitive paint to a hemispherical dome in unsteady transonic flow. Exp Fluids 50, 1495–1505 (2011). https://doi.org/10.1007/s00348-010-1010-1

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  • DOI: https://doi.org/10.1007/s00348-010-1010-1

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