Effects of density and water-entry angle on variations of the maximum impact acceleration of the projectile in water-entry process

Projectile water-entry experiments under the working medium with different densities and various water entry angles were performed. Under the temperature of 30°C, mass fraction of lithium bromide solution was changed to obtain various densities. The mass fraction was 1%, 2%, and 3%. The water-entry angles were 25°, 27.5°, and 30°. Real-time variation of the impact acceleration was got by acceleration transducer. Via the analysis, the maximum impact accelerations under all conditions were obtained. Results indicated that with the increase of density, the maximum impact acceleration grew gradually. The maximum impact acceleration increased steadily with the growing of water-entry angle. Variation degree of the maximum impact acceleration indicated that effects of density were more significant than that of water entry angle.