Author: College of Aeronautics (Cranfield, Bedfordshire)Publisher:
ISBN:
Category :
Languages : en
Pages : 47
Book Description
On Surface Pressure Fluctuations in Turbulent Boundary Layer
Author: College of Aeronautics (Cranfield, Bedfordshire)Publisher:
ISBN:
Category :
Languages : en
Pages : 47
Book Description
Some Features of Surface Pressure Fluctuations in Turbulent Boundary Layers with Zero and Favorable Pressure Gradients
Author: Brian E. McGrathPublisher:
ISBN:
Category : Boundary layer noise
Languages : en
Pages : 138
Book Description
On Surface Pressure Fluctuations in Turbulent Boundary Layers
Author: G. M. LilleyPublisher:
ISBN:
Category : Pressure
Languages : en
Pages : 26
Book Description
Bursts and Pressure Fluctuations in Turbulent Boundary Layers
Author: Peter BradshawPublisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 52
Book Description
Surface pressure fluctuations below turbulent boundary layers were studied, in part, because they can be regarded as 'footprints' of passing turbulent eddies. The pressure fluctuations are formally described by a Poisson equation, implying that the pressure fluctuation at a given point is mathematically represented by the integral of a 'source' term over the whole flow field, with a weighting inversely proportional to the distance of the source from the given point. In turbulent boundary layers, fluctuations were made in a low-speed constant pressure the high-frequency part of the wall pressure fluctuations is generated mainly within the inner layer - say, the first 20% of the boundary layer thickness - and the low-frequency part is generated mainly in the outer layer. Measurements of velocity and surface-pressure turbulent boundary layer well downstream of an extensive region of wall roughness. The turbulence near the wall was representative of a smooth-wall flow, while that in the outer layer was typical of the upper stream rough-wall flow. Comparison with previous measurements on an entirely smooth wall illustrates the relative contributions of the inner and outer layers to the surface pressure fluctuations. Further work has been done to compare the VITA (Variable ge) conditional-sampling algorithm withuctuations were more advanced algorithms. Keywords: Turbulent boundary layer, Noise measurement, Statistical analysis, Surface roughness, and VITA algorithm.
An Experimental Study of Surface Pressure Fluctuations in a Separating Turbulent Boundary Layer
Author: A Study of Surface Pressure Fluctuations in Hypersonic Turbulent Boundary Layers
Author: Kizhanatham Raghavachary RamanPublisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 100
Book Description
Computation of the Spectra of Turbulent Boundary Layer Surface- Pressure Fluctuations
Author: John H. LinebargerPublisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 288
Book Description
Pressure Fluctuations in Turbulent Boundary Layers
Author: M. V. LowsonPublisher:
ISBN:
Category : Atmospheric pressure
Languages : en
Pages : 36
Book Description
Surface Pressure Fluctuations Produced by Attached and Separated Supersonic Boundary Layers
Author: Alan L. KistlerPublisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 26
Book Description
Measurements were obtained of the pressure fluctuations on a solid surface immersed in a supersonic stream for Mach numbers up to 5.0. The pressures resulting from both the attached and separated turbulent boundary layers were investigated. The results for the attached layer show that the root mean square value of the pressure fluctuation is proportional to the mean shear stress at the wall with a proportionality constant that is only weakly dependent on Mach number. The convection velocity characterizing the space-time correlations of pressure on the wall decreases with increasing Mach number, as does the ratio of the scale of the pressure fluctuations to the geometrical boundary layer thickness. The pressures associated with the separated flow produced by a forward facing step were significantly larger than the pressures produced by an attached boundary layer. The data can be interpreted as showing that the pressure fluctuations originate from two distinct causes, fluctuations due to changes in geometry of the separated region and fluctuations due to the disturbed motion within the separation bubble. (Author).
Author: D.J.M. Williams