EXPERIMENTAL INVESTIGATION OF INITIAL TEMPERATURE FOR SPRAYED WATER INFLUENCE ON THE EVAPORATION INTENSITY AT THE MOVING THROUGH FLAME

The article presents scheme, technique and results of experimental investigation of initial temperature for sprayed water influence on the evaporation intensity at movement through the flame with fixed height. The modern high-speed measuring system of two-phase vapor-liquid streams diagnostics on the basis of Particle Image Velocimetry (PIV) method is used for the recording and processing of video frames. It is established that the measurement errors of liquid droplet sizes are no more than 0.001 mm, speed of the combustion products and water drops — 2 %. Video frames and the velocities fields of the sprayed liquid drops groups (water with “tracing” of the titan dioxide nanopowder particles) on an inlet and outlet of a high-temperature combustion products zone are provided. Limit changes of the drops sizes and speeds at movement through a flame are established. Essential influence of the sprayed liquid initial temperature on completeness of its evaporation at moving through the flame with fixed height is shown. The approximating expressions allowing to determine the optimal parameters of liquid dispersion at the flames localization for different initial temperatures are formulated