Simultaneous determination of temperature and velocity flow fields by enhanced two-color PTV technique

Inherent or laser induced irradiation of individual solid/liquid tracer particles or distinguishable groups of molecules (e.g. injected into hot flow in the form of liquid evaporating droplets) is examined as an information source of both temperature and velocity fields in an assumption of accurately measurable radiation intensity, captured from individual tracer, associated with tracer´s temperature. Feasibility, limitations and most attractive embodiments of the technique as applying primarily to high-temperature flows using commercially available visible and near-infrared CCD sensors are considered. Error analysis of the measurement system has been carried out using numerically simulated images for preferred embodiments. Numerical simulation experiments carried out verify feasibility and estimated features of proposed technique. This technique seems to be quite attractive alternative to more sophisticated technologies for a number of particular applications most of all due to much less expensive implementation and simple calibration providing acceptable accuracy with sub-pixel spatial resolution. Undergoing demonstration experiments are described.