Comparison water spray characteristics for inlet air cooling of gas turbine by means of a Phase Doppler Anemometry

Abstract

The aim of this study is to understand the spray properties and to clarify an influence of spray formation on the cooling efficiency of air. A phase Doppler anemometry (PDA) provides spray properties. Air temperatures before cooling and after cooling are measured. A impaction pin type nozzle and hole type nozzle are tested. For both nozzles, evaporation of droplets becomes inactive when humidity is high. For pin type nozzles, spray droplets exist in large area and are smaller than those of hole type nozzle. For hole type nozzle, droplets size is larger and spray area is smaller compared with pin type nozzle. The cooling efficiency for pin type nozzle is larger than that of hole type nozzle. The cooling efficiency becomes large when droplets are small and spray area is large.