喷水推进两栖车辆水面航行特性试验与数值计算研究

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.