ESTIMATE OF DESPERSED PHASE VELOCITY AND TEMPERATURE IN PLASMA-ARC SPRAYING JETS
A system for optical control of dispersed phase velocity and temperature in plasma-arc spraying was developed. Based on the virtual instruments concept it integrates technical vision camera HD1-1312-1080-G2 photo-spectrometer LR1-T and MATLAB environment. Camera HD1-1312-1080-G is applied for thermo-physical data acquisition. LR1-T spectrometer provides spectral pyrometry channel and control of plasma line spectrum in the spectral range of the image sensor. A new models for particles velocity and temperature calculation based on their track images are introduced. A brightness pyrometry method for temperature measurements of moving objects based on calibration using stationary temperature standard is introduced. Experimental results on dispersed phase velocity and temperature measurements in spraying jets of “Plazer” facility are presented (Paton Electric Welding Institute of NAS of Ukraine, Kiev). Work performed in the framework of the joint project of RFBR (№ 14-08-90428) and of National Academy of Sciences Ukraine (№ 06-08-14), and also supported in part by the Ministry of Education of Russia (№ 2014/505 task to perform public works in the field of scientific activity within the base portion) and a grant Ugra State University.