Transducer Resolution Effect on Pressure Fluctuations Beneath Hypersonic Turbulent Boundary Layers

Huang, Junji; Duan, Lian; Casper, Katya Marie; Wagnild, Ross Martin; Bitter, Neal P.

doi:10.2514/1.j062994

Transducer Resolution Effect on Pressure Fluctuations Beneath Hypersonic Turbulent Boundary Layers

Journal Article · Wed Jan 10 23:00:00 EST 2024 · AIAA Journal

DOI:https://doi.org/10.2514/1.j062994· OSTI ID:2333740

Huang, Junji ^[1]; ^[1]; Casper, Katya Marie ^[2]; Wagnild, Ross Martin ^[2]; Bitter, Neal P. ^[3]

The Ohio State Univ., Columbus, OH (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Johns Hopkins Univ., Baltimore, MD (United States)

The size of a pressure transducer is known to affect the accuracy of measurements of wall-pressure fluctuations beneath a turbulent boundary layer because of spatial averaging over the sensing area of the transducer. In this paper, the effect of finite transducer size is investigated by applying spatial averaging or wavenumber filters to a database of hypersonic wall pressure generated from a direct numerical simulation (DNS) that simulates the turbulent portion of the boundary layer over a sharp 7° half-angle cone at nominally Mach 8. Here, a good comparison between the DNS and the experiment in the Sandia Hypersonic Wind Tunnel at Mach 8 is achieved after spatial averaging is applied to the DNS data over an area similar to the sensing area of the transducer. The study shows that a finite sensor size similar to that of the PCB132 transducer can cause significant attenuation in the root-mean-square and power spectral density (PSD) of wall-pressure fluctuations, and the attenuation effect is identical between cone and flat plate configurations at the same friction Reynolds number. The Corcos theory is found to successfully compensate for the attenuated high-frequency components of the wall-pressure PSD.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); US Department of the Navy, Office of Naval Research (ONR)

Grant/Contract Number:: NA0003525

OSTI ID:: 2333740

Report Number(s):: SAND--2024-03980J

Journal Information:: AIAA Journal, Journal Name: AIAA Journal Journal Issue: 3 Vol. 62; ISSN 0001-1452

Publisher:: AIAACopyright Statement

Country of Publication:: United States

Language:: English

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Transducer Resolution Effect on Pressure Fluctuations Beneath Hypersonic Turbulent Boundary Layers

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