ABSTRACT

Hydrodynamic performance plays an important role on energy consuming and safety for autonomous underwater vehicles (AUVs). The hydrodynamics of the whole process of AUV free running pushed by a rotating propeller was investigated with physics-based simulations by using multi-block hybrid dynamic grids method, URANS, coupled to 6DOF and UDFs. The AUV had cruised for approximately 14.1 s and 7.105 m from stationary to a constant velocity at 300RPM. The simulation results included an acceleration state and a steady state. In the acceleration state, the thrust decreased quickly and had four periodic cycles in one propeller revolution. The thrust amplitude varied as the velocity increased. The computed velocity history was compared to tests and agreed well. In the steady state, the propulsion factors were compared with that in the literature and agreed well. The flow field variations of pressure and velocity were investigated temporally and spatially for the two states.

摘要

水动力性能对自主水下航行器 (AUV) 的能耗和安全性起着重要作用。通过使用多块混合动力网格方法 URANS 与 6DOF 和 UDF 耦合，通过基于物理的模拟研究了由旋转螺旋桨推动的 AUV 自由运行的整个过程的流体动力学。AUV 从静止到 300RPM 的恒定速度巡航了大约 14.1 s 和 7.105 m。仿真结果包括加速状态和稳态。在加速状态下，推力迅速下降，螺旋桨一转有四个周期循环。推力幅度随着速度的增加而变化。计算出的速度历史与测试进行了比较，结果一致。在稳定状态下，推进因素与文献比较，一致。针对两种状态在时间和空间上研究了压力和速度的流场变化。