Direct Numerical Simulation of Acoustic Noise Generation from the Nozzle Wall of a Hypersonic Wind Tunnel | Zendy

Junji Huang | Zendy; Lian Duan | Zendy

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Direct Numerical Simulation of Acoustic Noise Generation from the Nozzle Wall of a Hypersonic Wind Tunnel

Author(s) -

Junji Huang,

Lian Duan

Publication year - 2017

Publication title -

46th aiaa fluid dynamics conference

Language(s) - English

Resource type - Conference proceedings

DOI - 10.2514/6.2017-3631

Subject(s) - wind tunnel , nozzle , hypersonic wind tunnel , acoustics , hypersonic speed , noise (video) , aerospace engineering , materials science , mechanics , physics , computer science , engineering , artificial intelligence , image (mathematics)

The acoustic radiation from the turbulent boundary layer on the nozzle wall of a Mach 6 Ludwieg Tube is simulated using Direct Numerical Simulations (DNS), with the flow conditions falling within the operational range of the Mach 6 Hypersonic Ludwieg Tube, Braunschweig (HLB). The mean and turbulence statistics of the nozzle-wall boundary layer show good agreement with those predicted by Pate’s correlation and Reynolds Averaged Navier-Stokes (RANS) computations. The rms pressure fluctuation prms/τw plateaus in the freestream core of the nozzle. The intensity of the freestream noise within the nozzle is approximately 20% higher than that radiated from a single flat pate with a similar freestream Mach number, potentially because of the contributions to the acoustic radiation from multiple azimuthal segments of the nozzle wall.

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