受约束航行体跨介质试验方案设计及其CFD分析

doi:10.7527/S1000-6893.2023.28488

Abstract

Abstract:

The force load exerted on the vehicle and the surface pressure exhibit an essential nonlinear behaviour and a time-varying characteristic due to the complicated multiphase flow in the process as the vehicle crosses the water-air interface. Considering the load feature and the multiphase interface evolution， a visualization experiment for force load measurement and multiphase interface evolution is designed. To verify the experiment scheme， a numerical framework is established by adopting the Volume of Fluid （VOF） multiphase model coupled with the overset mesh. The force load， changed phase interface， pressure， velocity and vortex structure evolution of the vehicle at different maximum depths of water entry and water entry rotation speeds are simulated. The simulation results indicate that the force load in the upstream face plays a main role compared with that in the other two directions， and its evolution shows a quasi-axisymmetric characteristic with the depth of water entry. In addition， the increased rotation speed enhances the force load exerted on the vehicle. The high-pressure region always exists on the head of vehicle and the low-pressure region is distributed on the shoulder. The influence of maximum depth of water entry on the pressure peak is limited. The distribution of streamline illustrates the complexity of the trans-media flow， and the velocity peak exists in the tail of vehicle. The vortex structure generates differentiation， growth， dissipation and extension due to the changed motion state and the action of different fluid in the trans-media process. Besides， the decreased maximum depth of water entry results in more complex multiphase interface， vortex structure scale and vortex evolution characteristics.

Key words: trans-media flow, force load, multiphase interface, overset mesh, vorticity analysis

CLC Number:

V211.3

Junyao LIU, Yong YU. Experimental scheme design of constrained vehicle in a trans-media process and CFD analysis of scheme[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(21): 528488-528488.

Figures/Tables 17

Fig.1

Fig.2

Table 1

Fig.3

Fig.4

Table 2

Computational cases

工况编号

转速

ω/（r·min^-1）

最大入水深度

200，300，400，500

2.5 D

300

1.5 D

，

2.5 D

，

3.5 D

Table 2

Fig.5

Table 3

Comparative analysis of different grid nodes for vehicle under condition of 200 r/min

网格编号	$N X$	$N Y$	$N Z$	$N 1$	$N 2$	$N 3$	$N 4$	网格总节点数	$F X 1 ⁃ m a x / N$	$F Y 1 ⁃ m a x / N$
1	230	313	83	52	68	16	20	6 067 650	127	46
2	280	380	100	64	80	20	24	10 878 208	135	55
3	336	456	120	78	101	24	29	18 755 548	139	53

Table 3

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

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编号	设备名称	用途
1	数据处理终端	数据记录、分析等处理
2	伺服电机	航行体运动动力输出
3	伺服控制线	电机状态传递
4	伺服驱动器	电机转速等状态调定
5	应变式六轴力/力矩传感器	航行体气动/水动载荷测量
6	数据传递线	测量数据传递
7	连杆机构	运动支撑机构
8	航行体	主要运动体
9	透明水箱	水介质承载
10	CCD相机	可视化流场获取

[1]	CUI Pengcheng, TANG Jing, LI Bin, MA Mingsheng, DENG Youqi. A conservative interpolation method for overset mesh via super mesh [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(3): 121569-121569.
[2]	LI Xu, ZHU Xiaoping, ZHOU Zhou, GUO Jiahao. Numerical simulation of flow field during landing for carrier-based aircraft near a moving base [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(12): 122131-122131.

Experimental scheme design of constrained vehicle in a trans-media process and CFD analysis of scheme

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