自由流turbulence对AUV船型水动力特性的影响
The effects of free stream turbulence on the hydrodynamic characteristics of an AUV hull form
摘要：
本文通过实验和数值模拟的方法研究了自由流湍流对自主水下航行器（AUV）在三种不同雷诺数、不同下潜深度和不同攻角下的流场演化的影响。实验在循环水槽中进行，利用声学多普勒测速仪（ADV）记录了水下机器人沿程的瞬时速度分布。利用实验测量的流向平均速度、湍流动能（TKE）和雷诺应力，验证了压力应变关联式中加入壁面反射项的雷诺应力模型（RSM）的预测能力。从基于高保真RSM的模拟中可以观察到，在存在自由流湍流的情况下，AUV船体上的压力、表面摩擦、阻力和升力系数减小。还绘制了不同淹没深度和迎角以及不同自由流湍流度下AUV船体水动力系数的变化曲线。从这个实验和数值研究的结论为AUV的设计提供了改进的设计范例的指导。
英文摘要：
This article presents experimental and numerical studies on the effect of free stream turbulence on evolution of flow over an autonomous underwater vehicle (AUV) hull form at three Reynolds numbers with different submergence depths and angles of attack. The experiments were conducted in a recirculating water tank and the instantaneous velocity profiles were recorded along the AUV using Acoustic Doppler Velocimetry (ADV). The experimental results of stream-wise mean velocity, turbulent kinetic energy(TKE) and Reynolds stresses were used to validate the predictive capability of a Reynolds stress model (RSM) with the wall reflection term of the pressure strain correlation. From the high fidelity RSM based simulations it is observed that in presence of free stream turbulence, the pressure, skin friction, drag and lift coefficients decrease on the AUV hull. The variation of the hydrodynamic coefficients were also plotted along the AUV hull for different values of submergence depth and angle of attack with different levels of free stream turbulence. The conclusions from this experimental and numerical investigation give guidance for improved design paradigms for the design of AUVs.
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