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Infrared Thermography Technique for Measuring Heat Transfer to a Film Cooled Object

Chen, Liang
http://rave.ohiolink.edu/etdc/view?acc_num=osu1461231944

Abstract Details

2016, Master of Science, Ohio State University, Aero/Astro Engineering.
An experimental investigation has been performed to verify heat flux measurements on a metallic film-cooled flat plate by using infrared thermography in a transient facility. Infrared thermography provides high-resolution temperature distributions and makes it easy to locate hot spots on the object of interest. Previous work has shown that infrared thermography can produce accurate measurement for an uncooled flat plate. The goal of this thesis is to show that infrared thermography can also measure heat flux for film-cooled components and lay the foundation for its use in full-scale rotating experiments. A stainless steel plate with rows of cooling holes was built for testing in a blowdown facility. During the experiment, the plate was exposed to hot main flow and supplied with low temperature air through the cooling holes. The heat flux on the plate surface was determined by performing a 3D ANSYS transient thermal analysis using the infrared temperature distribution as time dependent top surface boundary conditions. The challenge of this technique for the film-cooled plate is that the boundary conditions are not known for the cooling channel walls and backside walls that exposed to cooling air since it is not practical to obtain measurements in those regions. Although strong jet impingement and forced convection are taking place on these walls, they are treated as adiabatic for the numerical analysis and the analysis time window is kept short so that through-wall conduction will not affect the top surface during the run. It is shown that the through-wall conduction from the backside and cooling channel walls only impact the regions right upstream the cooling holes and only after a relatively long run time. The fidelity of this technique is verified by comparing the results calculated based on the infrared images to the results obtained from traditional heat-flux gauges. The infrared thermography and the heat-flux gauges measurements agree within 10% for the regions that are not affected by backside and cooling channel walls boundary conditions. When the boundary conditions and through-wall conduction do impact the results, the adiabatic wall assumption causes the infrared thermography to predict a lower heat flux than the heat-flux gauges. After the method had been clearly demonstrated, it was used to make comparisons between cooled and uncooled cases to clearly identify how the film cooling spreads and mixes from the rows of cooling holes.
Randall Mathison, Dr (Advisor)
Michael Dunn, Dr (Committee Member)
Herman Shen, Dr (Committee Member)
114 p.
Aerospace Engineering
Infrared thermography; Heat transfer; Film Cooling

Recommended Citations

Citations

  • Chen, L. (2016). Infrared Thermography Technique for Measuring Heat Transfer to a Film Cooled Object [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461231944

    APA Style (7th edition)

  • Chen, Liang. Infrared Thermography Technique for Measuring Heat Transfer to a Film Cooled Object. 2016. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1461231944.

    MLA Style (8th edition)

  • Chen, Liang. "Infrared Thermography Technique for Measuring Heat Transfer to a Film Cooled Object." Master's thesis, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461231944

    Chicago Manual of Style (17th edition)

osu1461231944
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This open access ETD is published by The Ohio State University and OhioLINK.