The measurement of adiabatic film cooling effectiveness data and heat transfer coefficient data for a row of fanshaped film cooling holes at different compound angles is presented in this paper. The measurements are performed at engine-like temperature ratios in a hot gas test facility on a flat test plate. For the film cooling geometry, a row of five laidback-fanshaped holes was used. The temperature distribution on the flat plate is measured using infrared-thermography (IR). Steady state measurements are used to obtain the film cooling effectiveness. For the determination of the heat transfer coefficient ratio with and without film cooling on the test plate, a transient measurement technique is applied. Results for both the adiabatic film cooling effectiveness and the heat transfer coefficient ratio are given. The influence of different blowing ratios on the injection with compound angles of 0°, 30° and 45° will be discussed. From this study, the increasing compound angle showed only small effects on the pitch-wise lateral averaged adiabatic film cooling effectiveness but increased the heat transfer on the film cooled flat plate with coolant injection.

This paper presents an application of infrared thermography measurements on a film cooled flat surface using a single cylindrical film cooling hole. Infrared thermography (IR) is used to obtain the full field surface distribution of the temperature and therefore the film cooling effectiveness. For accurate results in-situ calibration of the infrared radiation intensity during the experiment needs to be performed, which is usually done using surface mounted thermocouples. For the near hole region thermochromic liquid crystals (TLC) are applied to obtain additional information for the calibration. A mixture of two narrow band TLCs is used, leading to discrete temperature lines on the surface. Using small variations in the test temperature settings, the TLC-lines can be located on the test surface into the regions of interest and the influence on the obtained infrared calibration results can be investigated. Experimental results for the film cooling effectiveness are presented for several blowing rates.

This paper presents experimental investigations for the measurement of the adiabatic film cooling effectiveness as well as the heat transfer coefficient distribution in film cooling experiments with a row of fanshaped holes on a flat plate. The temperature distribution on the flat plate is measured using infraredthermography (IR). Adiabatic wall effectiveness data are obtained using a high-temperature plastic material. Although a low thermal conductivity material is used, the measured temperature distribution is not identical with the adiabatic temperature distribution. The measured temperature field shows influences of 3D heat conduction inside the test plate. The effects of the heat conduction inside the test plate are modeled using the FE-method to re-evaluate the adiabatic wall temperature and to calculate the coolant gas exit temperature, which is used for the adiabatic film cooling effectiveness. For the measurement of the heat transfer coefficient ratio with and without film cooling (h f /h 0 ) a transient method is used. Temperature transients on the test surface are initiated by switching the coolant flow and are recorded using IR-thermography. The measured wall temperature histories are converted into heat flux values assuming a semi-infinite wall model during the experiment. NOMENCLATURE α [°]stream-wise injection angle c p [J/(kgK)] heat capacity at constant pressure d [m] non-cylindrical length of the cooling hole 1