近冰面航行条件下冰-水耦合作用对极区AUV水动力性能影响机理研究

极区AUV近冰面航行时，冰-水-艇体复杂相互耦合作用使其水动力特性及绕流场不同于自由面和大潜深航行工况。连续冰层及自由面-浮冰-水耦合作用下的壁面效应对AUV的水动力特性及绕流场影响机理问题是目前极地AUV水动力性能设计及优化过程中亟待解决的问题。本项目针对AUV在极区连续冰层、浮冰、自由面和水等多物理场耦合作用下的水动力性能和绕流场分布特性影响问题，拟采用数值计算和模型试验相结合的研究方法，数值研究中采用大涡模拟结合离散元方法对连续冰层及浮冰影响下的AUV水动力性能进行计算；试验研究中，基于粒子图像测试技术（PIV）开展AUV受连续冰层及浮冰影响下的水动力及绕流场测试研究。结合数值及试验结果，揭示近冰面复杂边界条件下AUV水动力性能及绕流场影响机理，为极地AUV的优化设计及航行安全稳定性研究提供参考。

AUV sailing near ice surface involves the interaction of ice-water-hull. Thus, the hydrodynamic characteristics and flow field are different from those of free surface and deep submergence sailing. The nonlinear motion characteristics and hydrodynamic performance influence mechanism of AUV sailing near ice surface are significant for its accurate capture in the process of launching and recovery near ice surface. The effect of ice sheet and free surface-pack ice- water coupling on the hydrodynamic characteristics and flow field of AUV is an urgent problem to be solved in the design and optimization of hydrodynamic performance of polar AUV. In this project, the hydrodynamic performance and flow field distribution characteristics of AUV under the coupling effect of ice sheet, pack ice, free surface and water are studied by combining numerical calculation and model test. In the numerical study, large eddy simulation(LES) combined with discrete element method(DEM) is used to calculate the hydrodynamic performance of AUV under the influence of ice sheet and pack ice. In the experimental study, the particle image velocimetry (PIV) was used to measure the hydrodynamics and flow field of AUV under the influence of ice sheet and pack ice. Combined with the numerical and experimental results, the hydrodynamic performance and flow field influence mechanism of the AUV under the complex boundary conditions near the ice surface are revealed, which provides a reference for the optimization design, safety and stability research of the polar AUV sailing in the ice area.