Corrections for Convective Heat Flux Gauges Subjected to a Surface Temperature Discontinuity

Kandula, Max; Reinarts, Thomas R.

doi:10.2514/6.2002-3087

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…Kandula and Reinarts [10] considered a quasi-2-D extension to approximately account for the cylindrical geometry of the heat flux gauge (Fig. 3).…”

Section: B Quasi-2-d Extensionmentioning

confidence: 99%

“…The purpose of this report is to extend the 2-D CFD study of Kandula and Reinarts [10] to a wider range of Mach numbers (1-5), and to further illustrate the role of property variations. This article is based on [12].…”

Section: Introductionmentioning

confidence: 98%

“…These analyses are based on constant thermal properties, and suffer from a number of simplifying assumptions. Two-dimensional computational fluid dynamics (CFD) calculations at Mach 4 on a flat plate by Kandula and Reinarts [10] accounted for the effect of property variations on the correction factors.…”

Section: Introductionmentioning

confidence: 99%

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Two-Dimensional Thermal Boundary Layer Corrections for Convective Heat Flux Gauges

Kandula

Haddad

2007

Journal of Thermophysics and Heat Transfer

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“…Kandula and Reinarts [10] considered a quasi-2-D extension to approximately account for the cylindrical geometry of the heat flux gauge (Fig. 3).…”

Section: B Quasi-2-d Extensionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Two-Dimensional Thermal Boundary Layer Corrections for Convective Heat Flux Gauges

Kandula

Haddad

2007

Journal of Thermophysics and Heat Transfer

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“…Schmidt-Boelter gauges are typically made of materials with relatively high specific heat and high thermal conductivity. A summary of this modeling can be found in Kandula and Reinarts (2002). In this situation, the heat flux into the gauge is not the same as the heat flux into the same area if the gauge is not present.…”

Section: Boundary Layer Analysismentioning

confidence: 99%

Corrections for Heat Flux Measurements Taken on Launch Vehicles

Reinarts¹

2004

AIP Conference Proceedings

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Knowledge of aerothermally induced convective heat transfer and plume induced radiative heat transfer loads is essential to the design of thermal protection systems (TPS) for launch vehicles. Aerothermal and radiative models are typically calibrated via the data from cylindrical, in-flight, flush-mounted surface heat flux gauges that are exposed to the external thermal and velocity boundary layers as well as thermal radiation. Typically, Schmidt-Boelter gauges, taking advantage of the 1-Dimensional Fourier's law, measure the incident heat flux. This instrumentation, when surrounded by low-conductivity insulation, has an exposed surface temperature significantly lower than the insulation. As a result of this substantial disturbance to the thermal boundary layer, the heat flux incident on the gauge tends to be considerably higher (potentially by factors of 2 or more) than it would have been on the insulation had the calorimeter not been there. In addition, the gauge can receive energy radially from the hotter insulation, contributing to the increase of the indicated heat flux. This paper will present an overview of an effort to model the heat flux gauge under typical flight conditions that includes an installation surrounded by high temperature insulation. The goal is to correct the measurements to reflect the local heat flux on the insulation had the instrument not been present. The three major components of this effort include: 1) a three-dimensional computational thermal math model including the internal conduction heat transfer details of a Schmidt-Boelter gauge, 2) a two-dimensional Navier-Stokes computational fluid dynamics (CFD) analysis to determine the effects on measurement of the rapidly changing thermal boundary layer over the near step changes in wall temperature, and 3) testing performed on flat plates exposed to an aerothermal environment in the Marshall Space Flight Center (MSFC) Improved Hot Gas Facility (IHGF). A brief summary of calibration issues will be presented, followed by the analytical efforts, as well as an update on testing results and preliminary model calibration results. Finally, recommendations will be made for installation and flight data corrections.

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“…Kandula and Reinarts [14] carried out a 2-D Navier-Stokes CID analysis with variable properties to investigate thermal boundary layer corrections for the local heat transfer coefficient. It was shown that the correction factor for convective heat transfer coefficient increases with the wall temperature.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional thermal boundary layer corrections for circular heat flux gauges mounted in a flat plate with a surface temperature discontinuity

Kandula¹,

Haddad²,

Chen³

2007

International Journal of Heat and Mass Transfer

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Corrections for Convective Heat Flux Gauges Subjected to a Surface Temperature Discontinuity

Cited by 6 publications

References 3 publications

Two-Dimensional Thermal Boundary Layer Corrections for Convective Heat Flux Gauges

Two-Dimensional Thermal Boundary Layer Corrections for Convective Heat Flux Gauges

Corrections for Heat Flux Measurements Taken on Launch Vehicles

Three-dimensional thermal boundary layer corrections for circular heat flux gauges mounted in a flat plate with a surface temperature discontinuity

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