Twenty-five years of aerodynamic research with infrared imaging

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.

show abstract

“…Gartenberg and Roberts (1992) reported an extensive retrospective on aerodynamic research with infrared cameras.…”

Section: Introductionmentioning

confidence: 99%

Infrared thermography for convective heat transfer measurements

2010

View full text Add to dashboard Cite

show abstract

“…The infrared technology has widespread successful applications in civil and military fields such as navigation, reconnaissance, medicine, remote sensing, space science, process control and device diagnostic. In the last two decades, with the infrared thermal imaging great success has been achieved in aerodynamics (Gartenberg and Roberts, 1992). In this paper, for the first time we apply the infrared thermal imager in the measurement of temperature of the waterjet.…”

Section: Introductionmentioning

confidence: 99%

Application of infrared thermal testing and mathematical models for studying the temperature distributions of the high-speed waterjet

Cui

Mao

2009

Journal of Materials Processing Technology

View full text Add to dashboard Cite

“…In both case the external heating can cause modification of interaction phenomena between solid bodies and the surrounding fluid flow. Anyway the passive technique is to prefer to the active one: in fact it has minimal interaction [4].…”

Section: (X)mentioning

confidence: 99%

“…Later, it became to be wider and wider applied in all the aforementioned sectors. Nowadays it is one of the most advanced measurements and fuses the positive aspects of traditional and advanced measurements; indeed it could be set in hostile ambient, if properly employed, no time-consuming and it performs a non-intrusive measurement of thermal surface distribution, caused by interaction between fluid and body [4]. These maps get information about boundary layer and can be reduced in convective coefficient distributions by an ad hoc thermal model or, using the following Reynolds' analogy, in any parameter of interest for aerodynamic aspects.…”

Section: Figure 1: a Typical Convective Coefficient Map Obtainedmentioning

confidence: 99%