INVESTIGATION of EFFUSION COOLING FLOW CHARACTERISTICS in JET ENGINES via PIV METHOD

Effusion cooling technology is the most advanced cooling technology used in modern combustion chambers. In this study, the effects of effusion film cooling on the main stream in a 1/9 scaled combustion chamber walls were investigated experimentally using Particle image velocimetry (PIV) method. For this purpose, the main stream Reynolds number (Reynolds number) was fixed to 15000. For the 2.25mm hole diameter effusion plate, the hole angles were changed by 30° and 45°, and for 7 different effusion flow rates, tests were done, and the cooling film formation was examined. By examining the data obtained from the PIV experiments, the flow map in the crossflow jet blends was obtained and the film formation characteristics were determined. According to the results of the flow map, during the low flow rate coolant flow, coolant jets were defeated by the main flow, but instead at high coolant flow rate, coolant jets became dominant and coolant film formation was observed. Furthermore, the increase in the cooling holes angles has been shown to have a negative effect on the cooling film formatio