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Junji_Huang_Thesis.pdf (33.05 MB)

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DNS of hypersonic turbulent boundary layers: wall pressure fluctuations and acoustic radiation

HUANG, JUNJI
http://rave.ohiolink.edu/etdc/view?acc_num=osu1650552101277098

Abstract Details

2022, Doctor of Philosophy, Ohio State University, Aerospace Engineering.
Understanding the physics of the pressure fluctuations induced by high-speed turbulent boundary layers (TBLs) is of major practical importance. The fluctuating pressure on aerodynamic surfaces of flight vehicles determines the vibrational loading of the vehicles and often leads to damaging effects as fatigue and flutter. The freestream pressure fluctuations radiated from the tunnel-wall TBLs are responsible for the genesis of freestream acoustic noise in conventional (i.e., noisy) supersonic and hypersonic wind tunnels. In this manuscript, wall and freestream pressure fluctuations induced by high-speed TBLs were characterized by direct numerical simulations (DNS). The DNS database covered a broad range of flow conditions (Mach number of $M_\infty = 2.5-14$, wall-to-recovery temperature ratio of $T_w/T_r = 0.18-1.0$, Reynolds number of $Re_\tau=450-1172$) and geometric configurations (flat plate, sharp circular cone, two dimensional channel, realistic wind-tunnel nozzle). The DNS overcame multiple experimental difficulties and provided access to wall and freestream pressure statistics that were difficulty to obtain otherwise, including the root-mean-square fluctuations and higher order moments (skewness and flatness) , probability density function , two-point correlation, convection speed, and coherence function. The study yielded useful insights into the physics of the boundary-layer-induced pressure field and provided critical assessment to reduced-order models such as the Corcos theory for modeling the wall pressure and the eddy-Mach-wave radiation theory for predicting the freestream acoustic pressure.
Lian Duan (Advisor)
Datta Gaitonde (Committee Member)
Jack McNamara (Committee Member)
Mei Zhuang (Committee Member)
232 p.
Aerospace Engineering
DNS; turbulence; turbulent boundary layer; acoustic radiation; wall pressure fluctuations; nozzle; cone

Recommended Citations

Citations

  • HUANG, J. (2022). DNS of hypersonic turbulent boundary layers: wall pressure fluctuations and acoustic radiation [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1650552101277098

    APA Style (7th edition)

  • HUANG, JUNJI. DNS of hypersonic turbulent boundary layers: wall pressure fluctuations and acoustic radiation. 2022. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1650552101277098.

    MLA Style (8th edition)

  • HUANG, JUNJI. "DNS of hypersonic turbulent boundary layers: wall pressure fluctuations and acoustic radiation." Doctoral dissertation, Ohio State University, 2022. http://rave.ohiolink.edu/etdc/view?acc_num=osu1650552101277098

    Chicago Manual of Style (17th edition)

osu1650552101277098
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This open access ETD is published by The Ohio State University and OhioLINK.