The transient film-cooling technique is used to find the efficiency of the cooling system in gas turbine components. During experiments, the IR window is heating up gradually and the calibrations were done before the experiments are not useful in the experiments because the window is heating up and readings are overshooting. kindly help me with this problem.
I have tested gas turbines all over the world. This is perhaps the largest business area for my employer. I have dealt with similar issues of IR on several occasions. If the window is heating up, you have no choice but to move farther away. The results will not be meaningful and equipment damage will result. I always "calibrate" such measurements at multiple locations with one or more surface temperature probes, which I pre- and post-calibrate (at least with ice and boiling water). I have also calibrated film cooling with several solutions. On more than one occasion I had no equipment because it was all lost in shipping. I bought a variety of things at the bazaar and auto repair shops, took lots of measurements, including ice and boiling several liquids and also pressure in clear slack tubes filled with water. I have even used a sack of assorted coins to calibrate a precision balance. When it's all over, ship everything back to the laboratory and do it all over again to post-calibrate everything. Which cooling system are you interested in? Evaporative coolers? Foggers? Inlet chillers?
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