Measurement of high-speed gas-droplet flow characteristics by pulse photography method

Abstract

The subject of this work is the optical probe measurement system for the measure of droplets parameters in high-speed two-phase flow. A system with dark-field illumination including two pulse lasers as illumination sources is used for droplets registration. Rays from lasers intersect at the angle of 120˚ and form a measurement volume. When a droplet crosses the volume, it refracts a part of the light. Refracted rays pass through the optical system and create two highlights on the sensor. Distance between two highlights is equal to the droplet diameter. System for measurement of coarse droplets parameters in wet steam flow, based on the described method, is developed. Main components of the system are the optical probe and PC with software. The system allows determining the following parameters of droplets: size distribution (20–600 µM), velocity distribution (0.1–300 m/s), movement direction. The results of measurements of the system in two-phase flow are presented in this work. The system is successfully operated as part of the complex for investigation of two-phase flow parameters on the model turbine.