Infrared thermography analysis of the transient aerothermal evolution in a turbofan core compartment model

Reulet, Philippe; Donjat, David; Divouron, Eric; Radenac, Emmanuel; Millan, Pierre

doi:10.3166/qirt.6.225-248

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…Optical-based techniques comprise infrared (IR) thermography [2,3], temperature sensitive paint (TSP) [4] or thermochromic liquid crystals [5]. In some applications, however, no optical access is available, and the experimentalist relies on thin film sensors [6], thermocouples [7], thermopiles [8], optical fibre probes [9] and calorimeters [10].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional (3D) inverse heat flux evaluation based on infrared thermography

Sousa

Lavagnoli

Paniagua

et al. 2012

Quantitative InfraRed Thermography Journal

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Inverse methods in heat transfer are generally associated with the estimation of unknown heat fluxes on inaccessible surfaces, based on temperature measurements performed on the accessible walls. In the present application, an inverse heat conduction method was developed that uses temperature measurements performed by infrared thermography. The threedimensional (3D) transient inverse heat transfer problem was solved by using an iterative regularisation with a conjugate gradient method. The inverse solver was coupled with a finite element commercial code. The efficiency of the method was demonstrated through numerical simulations and experimentally validated in a simplified set-up.

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Section: Introductionmentioning

confidence: 99%

Three-dimensional (3D) inverse heat flux evaluation based on infrared thermography

Sousa

Lavagnoli

Paniagua

et al. 2012

Quantitative InfraRed Thermography Journal

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show abstract

“…But their applicability is restricted to very simple configurations (such as forced convection over an infinite or semiinfinite thick plate [1,2] or in a channel with thick walls [3]). Alternatively, experiments are essential at least for validation (for instance, the study reported in paper [4]). But they are expensive.…”

Section: Introductionmentioning

confidence: 99%

Methodology of numerical coupling for transient conjugate heat transfer

Radenac¹,

Gressier²,

Millan³

2014

Computers & Fluids

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This paper deals with the construction of a conservative method for coupling a fluid mechanics solver and a heat diffusion code. This method has been designed for unsteady applications. Fluid and solid computational domains are simultaneously integrated by dedicated solvers. A coupling procedure is periodically called to compute and update the boundary conditions at the solid/fluid interface. First, the issue of general constraints for coupling methods is addressed. The concept of interpolation scheme is introduced to define the way to compute the interface conditions. Then, the case of the Finite Volume Method is thoroughly studied. The properties of stability and accuracy have been optimized to define the best coupling boundary conditions: the most robust method consists in assigning a Dirichlet condition on the fluid side of the interface and a Robin condition on the solid side. The accuracy is very dependent on the interpolation scheme. Moreover, conservativity has been specifically addressed in our methodology. This numerical property is made possible by the use of both the Finite Volume Method and the corrective method proposed in the current paper. The corrective method allows the cancellation of the possible difference between heat fluxes on the two sides of the interface. This method significantly improves accuracy in transient phases. The corrective process has also been designed to be as robust as possible. The verification of our coupling method is extensively discussed in this article: the numerical results are compared with the analytical solution of an infinite thick plate in a suddenly accelerated flow (and with the results of other coupling approaches).

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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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Infrared thermography analysis of the transient aerothermal evolution in a turbofan core compartment model

Cited by 5 publications

References 3 publications

Three-dimensional (3D) inverse heat flux evaluation based on infrared thermography

Three-dimensional (3D) inverse heat flux evaluation based on infrared thermography

Methodology of numerical coupling for transient conjugate heat transfer

Infrared thermography for convective heat transfer measurements

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