Goertler instability of a hypersonic boundary layer

Luca, Luigi De; Cardone, Gennaro; Chevalerie, D. Aymer de la; Fonteneau, A.

doi:10.1007/bf00188500

Cited by 42 publications

(26 citation statements)

References 13 publications

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“…This wavelength would be the one most likely to grow. However, the value of K l obtained experimentally is usually greater than that predicted theoretically, and it has been suggested the wavelength selection mechanism strongly depends on particular experimental configurations, such as the tunnel characteristics and leading edge imperfections [23]. A Gö rtler number can defined from K l as…”

Section: Gö Rtler Numbersmentioning

confidence: 98%

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Numerical simulation of Görtler vortices in hypersonic compression ramps

Navarro‐Martinez

Tutty

2005

Computers & Fluids

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Section: Gö Rtler Numbersmentioning

confidence: 98%

“…However, as widely suggested [11,23,33,35], for better comparison with linear theory, the length given by (3) has been used as a reference value. The appropriate value to use for R in the critical region of reattachment is not obvious, because the curvature is not constant.…”

Section: Gö Rtler Numbersmentioning

confidence: 99%

Numerical simulation of Görtler vortices in hypersonic compression ramps

Navarro‐Martinez

Tutty

2005

Computers & Fluids

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“…E.g., as shown by de Luca et al (1990ade Luca et al ( , 1993 and Simeonides et al (1993) in the study of Goertler vortices in hypersonic flow, the requirement of data restoration is stressed in heat transfer phenomena where relatively high temperature gradients are present. In fact, the possibility that accurate measurements of variable convective heat transfer coefficients may be performed by means of IR thermography depends on the chance that all potential error sources, linked to environment, thermal sensor and IR camera, can be removed.…”

Section: Analysis Of Measurement Errorsmentioning

confidence: 99%

Infrared thermography for convective heat transfer measurements

2010

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This paper deals with the evolution of infrared (IR) thermography into a powerful optical tool that can be used in complex fluid flows to either evaluate wall convective heat fluxes or investigate the surface flow field behavior. Measurement of convective heat fluxes must be performed by means of a thermal sensor, where temperatures have to be measured with proper transducers. By correctly choosing the thermal sensor, IR thermography can be successfully exploited to resolve convective heat flux distributions with both steady and transient techniques. When comparing it to standard transducers, the IR camera appears very valuable because it is non-intrusive, it has a high sensitivity (down to 20 mK), it has a low response time (down to 20 ls), it is fully two dimensional (from 80 k up to 1 M pixels, at 50 Hz) and, therefore, it allows for better evaluation of errors due to tangential conduction within the sensor. This paper analyses the capability of IR thermography to perform convective heat transfer measurements and surface visualizations in complex fluid flows. In particular, it includes the following: the necessary radiation theory background, a review of the main IR camera features, a description of the pertinent heat flux sensors, an analysis of the IR image processing methods and a report on some applications to complex fluid flows, ranging from natural convection to hypersonic regime.

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“…These vortices alter the heat transfer coefficient distribution on the wall and under certain conditions cause boundary layer transition, [16][17][18] making the measurement of the heat transfer coefficient a critical parameter.…”

Section: Introductionmentioning

confidence: 99%