Experimental investigation of oblique water entry of high-speed truncated cone projectiles: Cavity dynamics and impact load

Sui, Yu-Tong; Zhang, A‐Man; Ming, Fu-Ren; Li, Shuai

doi:10.1016/j.jfluidstructs.2021.103305

Cited by 46 publications

(3 citation statements)

References 32 publications

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“…The resistance of the paddy field mud to the fertiliser particle greatly determines the entering speed of fertiliser particles into the soil and ultimately affects the fertilisation depth. Therefore, by analysing the impacting process of fertiliser particles on the mud, the factors affecting the resistance of fertiliser particles can be determined (May & Woodhull, 1948;Shen et al, 2022;Jalalisendi & Porfiri, 2018;Wen et al, 2020;Sui et al, 2021). After the fertiliser particle is impacted, it enters the mud and moves from OAA' to O'BB', as shown in Figure 2.…”

Section: Analysis Of the Key Parameters Resistance Of Mud To Fertilis...mentioning

confidence: 99%

Study on the Effect of Key Parameters of a Fertilisation Device on Fertilisation Depth

et al. 2022

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In view of the problems of the uneven spatial distribution of particle fertiliser and unstable depths of side-deep fertilisation, caused by existing fertiliser application devices in fertile ditches, the influence of key factors of fertiliser application devices on the depth of fertilisation was studied, in combination with the agronomic characteristics of side-deep fertilisation for the direct seeding of rice in the middle and lower reaches of the Yangtze River. By analysing the incident mud process of fertiliser particles, the factors influencing the impact of mud resistance were determined. Through the theoretical and simulation analysis of the fertilisation device, it was determined that the impact distance, the impact surface radian and the fertiliser particle diameter have the greatest impact on the fertilisation depth of the device. Single factor and orthogonal tests were carried out, with three key factors as test factors and fertilisation depth as the test index. The test results revealed that the influence of the three factors on fertilisation depth follows the order of fertiliser particle diameter > impact distance > impact surface radian. With the maximum fertilisation depth as the objective, the optimal combination of the working parameters was identified as fertiliser particle diameter = 16.0 mm, impact distance = 56.5 mm, and impact surface radian = 29.6°. Furthermore, field tests were carried out in paddy fields with a water content of 37.00 ± 2.60%. When the fertilisation depth was pre-set as 50 mm, the relative error between the pre-set value and actual fertilisation depth was lower than 8.8%. The fertilisation depth can meet the agronomic requirements of side deep fertilisation and the results provide an important reference for the design of a non-contact fertilisation device for direct rice seeding.

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Section: Analysis Of the Key Parameters Resistance Of Mud To Fertilis...mentioning

confidence: 99%

Study on the Effect of Key Parameters of a Fertilisation Device on Fertilisation Depth

et al. 2022

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“…During the projectile's continuing motion, the cavity slides back along its surface and develops into supercavitation. The supercavitation separates the projectile from the water, lowers the underwater friction resistance of the projectile, and significantly increases the projectile's underwater navigation speed and target damage [9][10][11]. Some of these scholars have conducted numerical analysis and experimental studies on the parallel motion of high-speed projectiles in water, and found that double-tube parallel launching had more complex cavitation flow fields and ballistic characteristics than single-tube launching [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Research on multiphase flow field characteristics of underwater gun double‐tube parallel firing

Zhang

2023

Propellants Explo Pyrotec

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The underwater muzzle flow field formed by the double‐tube launch will interfere with each other, resulting in large changes in the characteristic parameters of the flow field and shock wave morphology. Therefore, the numerical model of three‐dimensional unsteady multiphase flow for underwater gun‐sealed launching was established. Meanwhile, an experimental platform for the underwater sealed launch was built and the rationality of the model was verified. The interior ballistic process compiled by UDF was coupled with the dynamic mesh technology, and the VOF multiphase flow model integrated with the Schnerr‐Sauer cavitation model was chosen to numerically calculate the muzzle flow field of the 30 mm underwater gun double‐tube parallel launch, and the numerical results were compared to those of the single‐tube launch. The results show that the gas is expelled from the muzzle and rapidly expands to form a gas cavity, and the “necking” phenomenon of the gas cavity occurs at 0.2 ms, while the Mach disk structure has formed. Due to the mutual interference between the flow fields formed by each tube, the diameters of the Mach disk are slightly different, and the flow field structure has a certain asymmetry in the evolution process. The core area of the shock wave is bowl‐shaped of the single‐tube launch, while it is not completely filled of the double‐tube launch. Within 0.5 ms, the diameter of the Mach disk increases monotonously when the single‐tube is launched, while it first increases and then decays by a double‐tube.

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“…Song et al [18] combined simulation and experimental methods to investigate the collapse and regeneration of cavities during the water-entry process of cylindrical projectiles. Sui et al [19] performed experiments on oblique water entry of high-speed projectiles with a truncated-cone head and cylindrical body, studying cavity evolution and impact loads. Hong et al [20] conducted an experimental study to investigate the transient cavity dynamics in the oblique water entry of a cylinder at a constant speed and proposed a simple theoretical model to describe the asymmetric cavity formation in the oblique water entry.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation into the Tail-Slapping Motion of a Projectile with an Oblique Water-Entry Speed

Lu,

Gao,

et al. 2023

JMSE

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In this study, the tail-slapping behavior of an oblique water-entry projectile is investigated through high-speed photography technology. The experimental images and data are captured, extracted and processed using a digital image processing method. The experimental repeatability is verified. By examining the formation, development and collapse process of the projectile’s cavity, this study investigates the impact of the tail-slapping motion on the cavity’s evolution. Furthermore, it examines the distinctive characteristics of both the tail-slapping cavity and the original cavity at varying initial water-entry speeds. By analyzing the formation, development and collapse process of the cavity of the projectile, the influence of the tail-slapping motion on the cavity evolution is explored. Furthermore, it examines the evolution characteristics of both the tail-slapping cavity and the original cavity under different initial water-entry speeds. The results indicate that a tail-slapping cavity is formed during the reciprocating motion of the projectile. The tail-slapping cavity fits closely with the original cavity and is finally pulled off from the surface of the original cavity to collapse. In addition, as the initial water-entry speed increases, both the maximum cross-section size of the tail-slapping cavity and the length of the original cavity gradually increase. With the increase in the number of tail-slapping motions, the speed attenuation amplitude of the projectile increases during each tail-slapping motion, the time interval between two tail-slapping motions is gradually shortened, the energy loss of the projectile correspondingly enlarges, and the speed storage capacity of the projectile decreases.

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Experimental investigation of oblique water entry of high-speed truncated cone projectiles: Cavity dynamics and impact load

Cited by 46 publications

References 32 publications

Study on the Effect of Key Parameters of a Fertilisation Device on Fertilisation Depth

Study on the Effect of Key Parameters of a Fertilisation Device on Fertilisation Depth

Research on multiphase flow field characteristics of underwater gun double‐tube parallel firing

Experimental Investigation into the Tail-Slapping Motion of a Projectile with an Oblique Water-Entry Speed

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