Heat Transfer Studies with IR Thermography Techniques

Abstract

The work carried out that is described on this report focuses on some experimental studies involving IR thermography techniques. The first part of the study has been centered in the investigation of IR transparent materials to be implemented as a window for the Linear Cascade facility that Chalmers has in the Applied Dynamics department. The results obtained for the material chosen are compared with the optical properties that the supplier provides. The main application of these results is intended to be used in the fluid dynamics laboratory, but it can be of application in many fields as for example combustion chamber measurements. Also, a new calibration and NUC (Non Uniformity Correction) has been made so that all the image corrections can be made automatically using MatLab code and LabView without any need of intermediate software. This will be explained more deeply in the report. Heat transfer experiments have been done in a subsonic Linear Cascade facility to simulate the thermal behaviour of Outlet Guide Vanes (OGVs) in jet engines. These are focused on measuring the convective heat transfer coefficient (HTC). This could help us optimize the design of this section of aeroengines. Finally, Temperature measurements have been carried out in the Linear Cascade facility using the window studied in the first part of the experiment in order to validate some correlations obtained for the transmittance of the window.