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Temperature and pressure imaging using infrared planar laser-induced fluorescence
David A Rothamer1, Ronald K Hanson
1Mechanical Engineering Department, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA. rothamer@wisc.edu
Applied Optics
|November 25, 2010
Summary
A novel infrared planar laser-induced fluorescence (IR-PLIF) technique enables simultaneous temperature and pressure imaging in gaseous flows. This advancement offers precise, two-dimensional measurements for various IR-active species.
Area of Science:
- Combustion diagnostics
- Fluid dynamics
- Spectroscopy
Background:
- Accurate measurement of temperature and pressure distributions in gaseous flows is critical for understanding and optimizing various physical and chemical processes.
- Existing diagnostic techniques often face limitations in spatial resolution, temporal response, or applicability to a wide range of species.
- Infrared (IR) active species are prevalent in many important applications, including combustion and atmospheric studies, necessitating advanced diagnostic tools.
Purpose of the Study:
- To develop and demonstrate a new diagnostic technique for simultaneous, two-dimensional (2D) measurements of temperature and pressure in gaseous flows.
- To leverage infrared planar laser-induced fluorescence (IR-PLIF) for non-intrusive diagnostics applicable to all IR-active species.
- To validate the technique's capability through experimental application in a supersonic jet.
Main Methods:
- Development of an infrared planar laser-induced fluorescence (IR-PLIF) technique.
- Implementation of a two-line excitation strategy for temperature measurements.
- Utilization of online and offline excitation on distinct rotational lines for pressure measurements.
Main Results:
- Successful demonstration of the IR-PLIF technique for simultaneous temperature and pressure imaging.
- The technique was applied to a supersonic underexpanded jet composed of CO2 and N2.
- This represents the first reported instance of temperature and pressure imaging using IR-PLIF, providing 2D spatial distributions.
Conclusions:
- The developed IR-PLIF diagnostic technique is effective for measuring temperature and pressure distributions in gaseous flows.
- The method is applicable to all IR-active species, significantly broadening its utility.
- The technique shows strong potential for single-shot, 2D measurements, offering a valuable tool for fluid dynamics research and engineering applications.
