Experimental and Numerical Study on Navigation Characteristics of Waterjet Propulsion Amphibian Vehicle

doi:10.12382/bgxb.2023.0620

Abstract

Abstract:

Special amphibious vehicles with the ability to maneuver on land, sail on water, and operate in the water-land interface zone are an important part of future multi-domain collaborative systems. The navigation characteristics of a waterjet propulsion amphibious vehicle under weak constraints are experimentally and numerically investigated. A numerical calculation method for the integrated control of waterjet propulsor and amphibious vehicles is established. The hydrodynamic performance of waterjet propulsion amphibious vehicle is studied. And the accuracy of the numerical calculation method is fully verified. The navigation characteristics of the amphibious vehicle under the conditions of towing and constrained self-propulsion at the designed speed are compared and analyzed. Compared with the conventional “ship-pump” integrated research, the research results on the mutual influence of waterjet propulsor and surface vehicle have been enriched from the perspective of amphibious vehicle. Under constrained self-propelled condition, the resistance of vehicle is increased by 17.6% compared to the resistance without waterjet propulsor. The change of vehicle attitude caused by the operation of waterjet propulsor is the main factor causing the increase of resistance. Compared with the condition of towing, the extension length of virtual length increases from -0.864 X/L (X is the length from the center of gravity of the vehicle, L is the total length of amphibious vehicle) to -1.513 X/L under the constrained self-propelled condition. At the same time, the wave height and divergent wave area of the chicken wake significantly increase from 0.037 H/L (H is the wave height)to 0.061 H/L, which leads to the increase of the energy loss near the wake field.

Key words: amphibious vehicle, waterjet propulsion, tank test, numerical simulation, navigation characteristics

CLC Number:

U469.6⁺93

LU Hang, LIU Haoran, CHEN Tairan, HUANG Biao, WANG Guoyu, CHEN Huiyan. Experimental and Numerical Study on Navigation Characteristics of Waterjet Propulsion Amphibian Vehicle[J]. Acta Armamentarii, 2024, 45(8): 2629-2645.

Figures/Tables 26

Fig.1 Test pool and trailer

Fig.2 Schematic diagram of amphibious vehicle model

Table 1 Parameters of amphibious vehicle and waterjet propulsor

参数	数值
两栖车总长L/m	2.14
两栖车总宽B/m	0.87
两栖车高/m	0.52
两栖车质量M/kg	240.05
喷水推进器叶轮直径/mm	149.5
喷水推进器喷口直径/mm	105
喷水推进器转速/(r·min^-1)	2286
喷水推进器流量/(m³·s^-1)	0.108
喷水推进器扬程/m	7.12
喷水推进器叶轮叶片数	6
喷水推进器导叶叶片数	8

Fig.3 Amphibious vehicle model

Table 2 Test bench instrument and equipment parameters

名称	参数	量程	精度
拖车	速度/(m·s^-1)	0.1~8.0	0.001
阻力传感器	力/N	1000	0.0005
三向测力天平	力/N	500	0.001
纵摇传感器	角度/(°)	45	0.1
升沉传感器	升沉值/mm	800	0.1
转矩转速功率测量仪	转矩/(N·m) 转速/(r·min^-1)	-99999~99999 0~20000	不超过 ±0.5%FS

Fig.4 Schematic diagram of towing device

Fig.5 Installation schematic diagram of amphibious vehicle

Fig.6 Resistance and attitude parameters of amphibious vehicle under different Froude number

Fig.7 Vehicle resistance and posture for Fr=0.629

Table 3 Image of vehicle body wave making test for Fr=0.629

Fig.8 Schematic diagram of computational domain and boundary conditions

Fig.9 Mesh of water-jet inlet duct

Fig.10 The distribution of y+ on the surface of vehicle

Table 4 Number of grids and time step size under different accuracies

参数	数值	参数	数值
G₁/10⁴	2082	T₁/s	0.007
G₂/10⁴	1150	T₂/s	0.005
G₃/10⁴	426	T₃/s	0.0035

Table 5 Grid and time step uncertainty calculation

航行条件	网格与时间步	参数	S₁	S₂	S₃	γ	p	U_SN[S₁%]
拖曳	网格	C_d	0.0309	0.031	0.0316	0.167	2.585	1.786
	时间步	C_d	0.0308	0.031	0.0322	0.0167	2.585	3.584
约束自航	网格	H^*	2.166	2.157	2.146	0.8182	0.290	4.121
		Q_rel	0.975	0.969	0.948	0.286	1.807	3.653
	时间步	H^*	2.172	2.157	2.137	0.75	0.415	4.345
		Q_rel	0.977	0.969	0.938	0.258	1.954	4.913

Fig.11 Comparison of calculated and experimental values of vehicle resistance and attitude

Fig.12 Comparison of numerical and experimental results[31] of characteristics of waterjet propulsor

Table 6 Comparison among wave pattern values and experimental results

Fig.13 Comparison of resistance of amphibious vehicle under towing and constrained sel-navigation

Fig.14 Comparison of vehicle bottom pressure nephograms

Fig.15 Pressure distribution and force of amphibious vehicle

Table 7 Comparison of vehicle headstream lines and Q nephograms

Fig.16 Comparison of water phase distributions of amphibious vehicle bottom

Table 8 Comparison of velocity profiles of central longitudinal section under towing and constrained self-propelled conditions

Fig.17 Wave-making characteristics under towed and constrained self-propelled conditions

Fig.18 Comparison of wave heights of different longitudinal sections

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