投弃式海流剖面仪探头流场数值模拟

Numerical Simulation the Flow Field of Expendable Current Profiler Probe

以三维Navier-Stokes方程为控制方程,结合k-ε两方程湍流模型,采用隐式有限体积法对投弃式海洋剖面仪(XCP)探头进行数值模拟,分析XCP探头周围流场的分布情况。根据XCP探头周围流场分布,对探头的运动特性,重点是探头的头部和尾翼流场进行分析。研究表明,在探头迎流前端小于10cm处,流体层流边界层发展为湍流边界层,因此探头头部的弧线型设计对于保证探头获得稳定的下落速度作用至关重要,探头尾翼虽然会减小下落速度,但有利于保证探头稳定的垂直下落姿态。研究结果验证了模拟计算方法的准确性,同时为同类探头的优化设计提供了参考依据。

In order to study the flow field of the Expendable Current Profiler （XCP） probe, based on the 3D Navier-Stokes equations for viscous unsteady incompressible flow, two- equation turbulence models are applied, the interaction flow field over the XCP probe is numerically simulated by implicit finite volume methods. The motion characteristics of the XCP probe are analyzed based on the flow field, especially, the flow field at the probe＇s tail and head. The simulated results show that the flow field is symmetrical, and the flow separation does not occur around the XCP probe. The laminar boundary layer is transformed into the turbulent boundary layer, which appears in the front-end 10cm of XCP probe. The head of the probe＇s arc design plays a very important role in the rapid and steady falling. The probe＇s tail has no advantage for fast falling, but contributes in keeping the vertical falling stance. These results verify the feasibility and effectiveness of this numerical analysis method and also provide a guidance for the optimization design of similar probes.