Measurements on rotating blades using IR thermography

Mori, Mitja; Novak, Lovrenc; Sekavčnik, Mihael

doi:10.1016/j.expthermflusci.2007.05.002

Cited by 41 publications

(21 citation statements)

References 12 publications

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“…With the improvement in sensitivity, IR thermography has been used to characterize the boundary-layer development over a model wing (de Luca et al 1990) and in convective heat transfer applications (Astarita et al 2000). However, recent investigations have also been focused toward aerodynamic measurements in rotating systems (Mori et al 2007;Richter and Schülein 2014). IR thermography has the advantage of high temperature resolution (~0.02 K), in comparison with TSP (~0.1 K) (Tropea et al 2007).…”

Section: Infrared Thermographymentioning

confidence: 99%

“…Recently, efforts have been focused more toward optical techniques for their high spatial resolution and relative ease of use. Investigations include the detection of boundary-layer transition and flow separation in propellers, helicopter rotors and turbine blades by temperaturesensitive paint (TSP) and pressure-sensitive paint (PSP) (Yorita et al 2012;Klein et al 2013), thermography (Mori et al 2007;Richter and Schülein 2014;Schülein 2014), oil film interferometry (Wadcock et al 1999;Schülein et al 2012) and micro-tuft imaging (Yamauchi et al 1997).…”

Section: Introductionmentioning

confidence: 99%

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Boundary-layer transition on a rotor blade measured by temperature-sensitive paint, thermal imaging and image derotation

et al. 2015

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Section: Infrared Thermographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Boundary-layer transition on a rotor blade measured by temperature-sensitive paint, thermal imaging and image derotation

et al. 2015

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“…The printed circuit is generally manufactured with several adjacent thin (down to 5 lm) copper tracks, closely spaced, arranged in a Greek fret mode (see Fig. 5) (2000), Dorignac et al (2001Dorignac et al ( ,2005 and Petre et al (2003) T (1990b, 1995a) HTF S/LW Gartenberg and Roberts (1991a, b), and Gartenberg and Wright (1994) T S/LW Cardone et al (1996Cardone et al ( , 1997b, Astarita et al (2002) and Astarita and Cardone ( (1990a, 1993, 1995b) (2007) T FPA/MW Rotating surfaces Cardone et al (1996Cardone et al ( , 1997a, Astarita et al (2002) and Astarita and Cardone (2008) HTF S/LW Boutarfa and Harmand (2005) and Pelle and Harmand (2006 T S -Seghir-Ouali et al (2006) T S - Mori et al (2007Mori et al ( , 2008, Sekavcnik et al (2008) and Novak et al (2008) T FPA/SW Bajcar et al (2008) T FPA/B Lyons et al (2008) TF -Separation/bluff body de Luca et al (1992Luca et al ( , 1995b TF S/LW Cardone et al (1997b) HTF S/LW Meinders et al (1997Meinders et al ( , 1999a and Meinders and Hanjalic (2002) HTF S/MW Ghisalberti and Kondjoyan (2001) HTF FPA/MW Montelpare and Ricci (2004a), Montelpare (2005, 2006) and Ricci et al (2007) HTF FPA/LW Mai et al (2008) T - Menfoukh et al (2008) T FPA/B Hypersonic flows de Luca et al (1990ade Luca et al ( , 1992…”

Section: Errors Due To the Thermal Sensormentioning

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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“…Transient techniques involve the measurement of the temperature change with time at a location near to or at the body. An example of this method is the determination of the surface temperature analyzing the emitted radiation intensity and wavelength using infrared cameras [10,11]. A direct heat transfer measurement method is the energy supply technique, in which the temperature of a solid surface is measured while actively providing heat [12,13].…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of the heat transfer coefficient for the optimal design of the cooling system of a PEM fuel cell placed inside the fuselage of an UAV

Barroso

Renau

Lozano

et al. 2015

Applied Thermal Engineering

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h i g h l i g h t sHeat transfer coefficients to refrigerate a HT-PEMFC stack are calculated. Experiments are performed in 2 wind tunnels, for 3 form factors and real conditions. The calculated heat transfer coefficient varies from 8 to 44 W m À2 K À1 . Results at sea level are suitably extrapolated for a target altitude of 10 km. Flow area is optimized as a function of the power required to cool the stack down. a b s t r a c tThe objective of this research is to calculate the heat transfer coefficients needed for the further design of the optimal cooling system of a high-temperature polymer electrolyte membrane fuel cell (HT-PEMFC) stack that will be incorporated to the powerplant of a light unmanned aerial vehicle (UAV) capable of reaching an altitude of 10,000 m. Experiments are performed in two rectangular tunnels, for three different form factors, in experimental conditions as close as possible to the actual ones in the HT-PEMFC stack. For the calculations, all the relevant thermal processes are considered (i.e., convection and radiation). Different parameters are measured, such as air mass flow rate, inlet and outlet air temperatures, and wall temperatures for bipolar plates and endplates. Different numerical models are fitted revealing the influence of the diverse relevant non-dimensional groups on the Nusselt number. Heat transfer coefficients calculated for the air cooling flow vary from 8 to 44 W m À2 K À1 . Results obtained at sea level are extrapolated for a flight ceiling of 10 km. The flow section is optimized as a function of the power required to cool the stack down to the temperature recommended by the membrane-electrode assembly (MEA) manufacturer using a numerical code specifically developed for this purpose.

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Measurements on rotating blades using IR thermography

Cited by 41 publications

References 12 publications

Boundary-layer transition on a rotor blade measured by temperature-sensitive paint, thermal imaging and image derotation

Boundary-layer transition on a rotor blade measured by temperature-sensitive paint, thermal imaging and image derotation

Infrared thermography for convective heat transfer measurements

Experimental determination of the heat transfer coefficient for the optimal design of the cooling system of a PEM fuel cell placed inside the fuselage of an UAV

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