Novel Method for Measuring Fine Particle Distribution in Shock-Induced Atomization

Abstract

The objective of this study is to obtain the particle size distribution of fine droplets formed by a breakup behind the shock wave. The algorithm for measuring the droplet diameter using the shadow sizing method was evaluated. The images of the liquid droplet breakup behavior were obtained using a high-speed camera attached to a long-range microscope. Calibration experiments were performed to obtain the relationship between the particle-camera distance, particle size, and particle image, and an algorithm was developed to derive a surface equation that identifies the particle-focus distance (-2 mm to 2 mm) within 0.3 mm error in depth of field and particle size (5-80 μm) within 6 μm error. The proposed particle size distribution measurement method was used to measure the particle size distribution of fine droplets by shock-induced atomization, and the volume probability density distribution of fine droplets in atomization was obtained in accordance with previous studies.