A Guide to Uncertainty Analysis of Hot-Wire Data

Yavuzkurt, Savas

doi:10.1115/1.3243096

Cited by 135 publications

(48 citation statements)

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“…Dantec single and X-array probes, types 55Pll, 14, 61 and 64, operated using Prosser type 6110 anemometer bridges interfaced to the PET computer, were used. Where necessary hot-wire mea- surements were corrected for the effects of high local turbulence levels using the methods of Tutu and Chevray (1975) and Yavuzkurt (1984). All probes were introduced to the flow through ports in the wall of the pipe.…”

Section: Apparatus and Instrumentationmentioning

confidence: 99%

An experimental study of two flows through an axisymmetric sudden expansion

Devenport

Sutton

1993

Experiments in Fluids

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Two turbulent separated and reattaching flows produced by a sudden expansion in a pipe have been studied. The first was produced by a simple axisymmetric sudden enlargement from a nozzle of diameter 80 mm to a pipe of diameter 150 mm. The second was the flow at the same enlargement with the addition of a centerbody 90 mm downstream of the nozzle exit. Detailed measurements of velocity and skin friction (made primarily using pulsed wires) and of wall static pressure are presented. Without the centerbody the flow structure is similar to that observed in other sudden pipe expansions and over backward-facing steps. A turbulent free shear layer, bearing some similarity to that of a round jet, grows from separation and then reattaches to the pipe wall downstream. Reattachment is a comparatively gradual process, the shear layer approaching the wall at a glancing angle. The introduction of the centerbody causes the shear layer to curve towards the wall and reattach at a much steeper angle. Reattachment is much more rapid; gradients of skin friction and pressure along the wall are many times those without the centerbody. The high curvature of the shear layer strongly influences its turbulent structure, locally suppressing turbulence levels and reducing its growth rate.

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Section: Apparatus and Instrumentationmentioning

confidence: 99%

An experimental study of two flows through an axisymmetric sudden expansion

Devenport

Sutton

1993

Experiments in Fluids

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“…Yavuzhurt (1984) calculated the errors in the Uem and ui by estimating the 0(2) terms in equations (A.6) using the data from Klebanoff and found that the total errors were less than 1-1.5% (assuming K,=0.2 and K 2 -1.02). …”

Section: Iw 2 W;mentioning

confidence: 99%

An experimental investigation of wall pressure fluctuations beneath nonequilibrium turbulent flows

Farabee¹

1986

The Journal of the Acoustical Society of America

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“…[28] is used to quantify the experimental uncertainties. The independent parameters such as atmospheric pressure, curve fitting error in calibration, A/D resolution uncertainty, probe positioning and humidity are considered in the uncertainty analysis.…”

Section: Methodsmentioning

confidence: 99%

Experimental study on correlation between turbulence and sound in a subsonic wind tunnel

2010

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In this paper, the effects of turbulence on sound generation and velocity fluctuations due to pressure waves in a large subsonic wind tunnel are studied. A trip strip located at different positions in the contraction part or at one position in the diffuser of a large wind tunnel is used to investigate the aforementioned phenomenon, and the results indicate that the trip strip has significant effects on sound reduction. The lowest turbulence intensity and sound are obtained from a trip strip with a diameter of 0.91 mm located either at X/L = 0.79 or at X/L = 0.115 in the wide portion of the contraction. Furthermore, the effect of monopole, dipole and quadrupole sources of aerodynamic noise at different velocities is investigated, and it is demonstrated that the contribution of the monopole is dominant, while the shares due to the dipole and quadrupole remain less important. In addition, it is found that the sound waves have a modest impact on the measured longitudinal turbulence and are generated essentially by eddies. List of symbolsbody force per unit volume P (r, t) instantaneous sound pressure (Pa) ρv i v j , T i j Lighthill tensor (kg·m −2 s −2 ) u 2 ,v 2 second order moments (m 2 ·s −2 ) U p wave propagation speed P sound pressure root mean square (Pa) ρ air density (kg·m −3 ) a 0 free stream sound velocity (m·s −1 ) v u ,u v shear stress tensor (m 2 ·s −2 ) Ma Mach number p pressure fluctuation u p x-component of the longitudinal velocity fluctuation due to the pressure field Cp fluctuating pressure coefficient R = |R| source-observer vector (R = r − r s) T e retarded time (r, t) time and space location of the observer Rs coordinates of the sources ϕ angle between r and r s n i unit normal to the body surface enclosed by S V i fluid velocity components F wall frequency (Hz) k H,n wind tunnel wavenumbers H width (height) of the test section λ H tunnel wavelength 123 532 M. D. Manshadi et al.

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A Guide to Uncertainty Analysis of Hot-Wire Data

Cited by 135 publications

References 0 publications

An experimental study of two flows through an axisymmetric sudden expansion

An experimental study of two flows through an axisymmetric sudden expansion

An experimental investigation of wall pressure fluctuations beneath nonequilibrium turbulent flows

Experimental study on correlation between turbulence and sound in a subsonic wind tunnel

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