Abstract
These experimental investigations are designed to study shock wave characteristics and spray structure. Supersonic liq- uid jets injected into ambient fields are empirically studied using projectile impacts in a two-stage light gas gun. This study looks primarily at the design of the nozzle assembly, the tip velocity of the high speed jet, the structure of the spray jet and the shock wave generation process. The supersonic liquid jets were visualized using an ultra high-speed camera and the schlieren system for visualization to quantitatively analyze the shock wave angle. The experimental re- sults with straight cone nozzle types and various non-Newtonian fluid viscosities are presented in this paper. The effects of nozzle geometry on the jet behavior are described. The characteristics of the shock wave generation and spray jet structure were found to be significantly related to the nozzle geometry. The expansion gases accelerated the projectile, which had a mass of 6 grams, from 250 m/s. As a result, it was found that the maximum jet velocity appeared in the liquid jet with high viscosity properties. Supersonic liquid jets, which occurred at the leading edge the shock waves and the compression waves in front of the jets, were observed. Also, the shock waves significantly affected the atomization process for each spray droplet.
Highlights
Supersonic liquid jets have been studied in various engineering fields such as material cutting, diesel injection and aerospace rocket nose design, to obtain the supersonic liquid jet break-up and shock wave structure mechanisms [1,2,3]
Supersonic liquid jets injected into ambient fields are empirically studied using projectile impacts in a two-stage light gas gun
The characteristics of the shock wave generation and spray jet structure were found to be significantly related to the nozzle geometry
Summary
Supersonic liquid jets have been studied in various engineering fields such as material cutting, diesel injection and aerospace rocket nose design, to obtain the supersonic liquid jet break-up and shock wave structure mechanisms [1,2,3]. A supersonic liquid jet can be generated with the impact of a high speed projectile made of bronze and stainless steel. When the liquid jet is injected into an outer field, supersonic liquid jets penetrate further away from the nozzle exit, and detached shock waves appear in front of the liquid jet. These shock waves are dependent on the injection velocity of the supersonic liquid jets. Supersonic liquid jets undergo an aerodynamic drag force that increases atomization performance
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