Numerical study of supercavitating flow around high-speed underwater projectile near different seabed obstacles

Fan, Chunyong; Li, Zengliang; Du, Mingchao; Yu, Ran

doi:10.1016/j.apor.2020.102440

Cited by 14 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Zhang

2023

Propellants Explo Pyrotec

View full text Add to dashboard Cite

show abstract

“…Super-cavitation morphological parameter information reflects the high-speed projectile motion characteristics [1]. Accurate measurement of super-cavitation morphological parameters for the cross-media projectile is the basis for highspeed projectile structural design and optimization, and has become one of the research hotspots of the underwater ballistic testing field [2]. With the development of the high-speed photography and the image processing technology, many researchers have conducted related researches on the super-cavitation contour feature extraction algorithms to reduce the huge workload of manual interpretation [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Super-cavitation contour extraction method based on multi-scale space

Kong

Chen

Wan

et al. 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

View full text Add to dashboard Cite

Super-cavitation morphological parameter information of the cross-media projectile reflects high-speed projectiles motion characteristics. Accurate measurement of super-cavitation morphological parameters is the basis for high-speed projectile structural design and optimization, becoming a research hotspot of the underwater ballistic testing field. With the development of the high-speed photography technology, recording the evolution process of projectile cavitation morphologies by high-speed cameras and acquiring super-cavitation morphological information through image processing methods have become one of the main research directions. Aiming at reducing the large workload of manual interpretation from super-cavitation images, a multi-scale space-based automatic contour extraction algorithm for supercavitation images captured by the array cross-media high-speed imaging system is introduced in this paper. The Canny edge detection method is applied to obtain the binary edge image with coarse extraction super-cavitation edge after image pre-processing. The super-cavitation contour point set is searched in the binary edge image and small gaps between adjacent endpoints are filled at the same time. The contour extraction algorithm based on the multi-space curvature characteristics is presented to calculate the curvature value of each contour point in the high-scale space, and the curvature feature points are determined by the threshold judgment approach. The contour feature points extracted in the high-scale space are located in the low-scale space precisely, and the super-cavitation contour is extracted. Experimental results show that, the proposed method can reduce the workload from manual interpretation while improve the accuracy of contour positioning, which can provide basic data support for the cross-media high-speed projectile super-cavitation morphological parameter measurement.

show abstract

“…7,8 studied the influence of free liquid on the cavity shape of the moving body and the flow field in the cavity through experiments and numerical methods. 9,10 used numerical methods to study the characteristics of supercavitation flow under complex environmental interference. The study obtained the law of the influence of environmental factors, such as density mutations and seabed obstacles, on the development of supercavitation morphology.…”

Section: Introductionmentioning

confidence: 99%

Numerical research of lateral flow influence on supercavitating flow

2022

Self Cite

View full text Add to dashboard Cite

In this paper, a recompiled multiphase flow solver, which introduced the lateral flow source into the code, is developed to investigate the effect of the lateral flow on the supercavitation phenomenon. The evolution of the supercavity profile and the resistance of the vehicle under different lateral flow speeds are studied. The results show that the recompiled solver can calculate the effect of the lateral flow on the supercavitation, and the influence of lateral flow on the supercavity is related to the speed of the counter flow. Under the same lateral flow velocity, the higher the convection velocity, the weaker the influence of lateral flow on the cavity profile and resistance. When the lateral flow velocity is less than 8% of the convection velocity, the effect of the lateral flow on the supercavity size and the resistance of the vehicle can be ignored. As the lateral flow strengthens, the supercavity will deform and even break and the resistance of the vehicle increases significantly. After removing the source of the lateral flow, the cavity re-grows again and forms a huge supercavity, which is much larger than the original one before introducing the velocity source. Then, the cavity gradually shrinks and reaches a new steady state.

show abstract

Numerical study of supercavitating flow around high-speed underwater projectile near different seabed obstacles

Cited by 14 publications

References 22 publications

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

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

Super-cavitation contour extraction method based on multi-scale space

Numerical research of lateral flow influence on supercavitating flow

Contact Info

Product

Resources

About