Hydrodynamic characterization of manned deep-sea submersible surfacing attitude
In order to study the hydrodynamic characteristics of the manned deep-sea submersible in different surfacing attitudes,this paper carries out hydrodynamic tests on the scaled-down simplified model of the Jiaolong deep submersible of 1:36.The drag,lift and pitching moment of the submersible in different surfacing attitudes are obtained by six-component sensors,and the lift power spectrum is obtained based on the Fourier transform method;the flow field in the wake of the sub-mersible is captured by the particle image velocimetry method,and the main modes of the flow field are obtained based on the intrinsic orthogonal decomposition(POD)method.The results show that,compared with the vertical surfacing attitude,the drag drops by 38.2％,the lift magnitude rises by 98.9％,the pitching moment drops by 20.8％,the vortex disappears in the stern wake area,and the maximal turbulent kinetic energy drops by 33.6％when surfacing at a 30° longitudinal rake angle;the increase of the surfacing longitudinal rake angle from 0° to 10° shifted the wake countercurrent area from the bow of the submersible to the stern,which resulted in the change of lift direction.In the POD first-order mode,the surfacing rake angle increases from 0° to 10°,the area of the stern wake countercurrent region decreases,and the area of the bow wake high-velocity region increases,resulting in a decrease in the bow pressure and an increase in the stern pressure,which makes the direction of lift change.
万方数据
维普
