Fluctuating Pressure Loads Under High Speed Boundary Layers
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Total Pages | : 18 |
Release | : 1987 |
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Author | : |
Publisher | : |
Total Pages | : 18 |
Release | : 1987 |
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Author | : M. V. Lowson |
Publisher | : |
Total Pages | : 36 |
Release | : 1965 |
Genre | : Atmospheric pressure |
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Author | : Tony L. Parrott |
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Total Pages | : 84 |
Release | : 1992 |
Genre | : Noise control |
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Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 28 |
Release | : 2018-08-16 |
Genre | : |
ISBN | : 9781725096882 |
A database is established on the fluctuating pressure loads produced on aerodynamic surfaces beneath 3-D shock wave/boundary layer interactions. Such loads constitute a fundamental problem of critical concern to future supersonic and hypersonic flight vehicles. A turbulent boundary layer on a flat plate is subjected to interactions with swept planar shock waves generated by sharp fins. Fin angles from 5 to 25 deg at freestream Mach numbers between 2.5 and 4 produce a variety of interaction strengths from weak to very strong. Miniature Kulite pressure transducers mounted in the flat plate were used to measure interaction-induced wall pressure fluctuations. These data will be correlated with proposed new optical data on the fluctuations of the interaction structure, especially that of the lambda-shock system and its associated high-speed jet impingement. Settles, Gary S. Unspecified Center NASA-CR-188919, NAS 1.26:188919 NAG1-1070...
Author | : John S. Serafini |
Publisher | : |
Total Pages | : 88 |
Release | : 1963 |
Genre | : Fluid dynamics |
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This experimental study was carried out at a free-stream Mach number of 0.6 and a Reynolds number per foot of 3.45 x 106. The magnitudes of the wall-pressure fluctuations agree with the Lilley-Hodgson theoretical results. Space-time correlations of the wall-pressure fluctuations generally agree with Willmarth's results for longitudinal separation distances. The convection velocity of the fluctuations is found to increase with increasing separation distances, and its significance is explained. Measurements with the longitudinal component of the velocity fluctuations indicate that the contributions to the wall-pressure fluctuations are from two regions, an inner region near the wall and an outer region linked with the intermittency.
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Total Pages | : 892 |
Release | : 1994 |
Genre | : Aeronautics |
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Author | : Tony L. Parrott |
Publisher | : |
Total Pages | : 44 |
Release | : 1989 |
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Author | : Junji Huang |
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Total Pages | : 0 |
Release | : 2022 |
Genre | : Turbulence |
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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.
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Total Pages | : 716 |
Release | : 1990 |
Genre | : Aeronautics |
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Author | : |
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Total Pages | : 1388 |
Release | : 1971 |
Genre | : Government publications |
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