Based on the deformation behavior and mechanism of droplet deformation under supersonic conditions

the deformation and fracture process of sub-millimeter water droplets(0.44-1.09 mm) under shock was observed in a horizontal shock tube. The shock Mach number range was 1.07-2.11. Using the schlieren method

in combination with the high-resolution high-speed camera to record the deformation and fracture characteristics of droplets under different crush modes

the droplet streak images of the bag-shaped crushing

multi-modal crushing

shearing and explosive crushing modes were obtained. The droplet pattern image was analyzed on the temporal and spatial relationship of the motion parameters of the droplet. The development law of the droplet deformation stage with different diameters

the dimensionless lateral deformation width of the droplet and the dimensionless windward surface displacement of the droplet with the dimensionless time were obtained. And the maximum dimensionless lateral deformation was obtained with different droplet breaking modes when the initial diameter of the droplet was the same. As for the width changes

the dimensionless transverse maximum deformation widths variation range of the bag-shaped

multi-modal and shear crushing modes was 1.15-1.61

and the dimensionless maximum transverse deformation widths variation range of the explosive crushing mode was 0.21-0.68.