Numerical analysis of cavitation evolution and excited pressure fluctuation around a propeller in non-uniform wake
Numerical analysis of cavitation evolution and excited pressure fluctuation around a propeller in non-uniform wake
复制标题
非均匀尾流中螺旋桨周围空化演化和激发压力脉动的数值分析
DOI：
10.1016/j.ijmultiphaseflow.2012.02.006
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发表时间：
2012-07-01
影响因子：
3.8
通讯作者：
Xu, Hongyuan
中科院分区：
文献类型：
--
作者：
Ji, Bin;Luo, Xianwu;Xu, Hongyuan
对非均匀尾流中常规螺旋桨的非定常空泡湍流进行了数值模拟，预测了激励压力脉动。基于Navier-Stokes方程，采用传质空化模型、k-ω SST湍流模型和滑移网格，对螺旋桨空泡进行了数值模拟。与实验结果相比，预测的非定常空泡和周围的压力波动的非均匀流的演变相当不错。计算流体动力学结果验证了叶片扫过高速尾流区时压力波动和变化的空化模式之间的联系。此外，为了更好地揭示空泡压力场的物理机制，对空泡体积进行了计算和分析，以说明空泡演化与压力波动之间的关系。分析表明，空泡体积变化引起的加速度是螺旋桨空泡产生压力脉动的主要原因。这些结果表明，这种数值方法是适合于模拟螺旋桨周围的非定常空泡流。(C)2012爱思唯尔有限公司保留所有权利。
Unsteady cavitating turbulent flows around a conventional marine propeller in a non-uniform wake were analyzed to predict the excited pressure fluctuations. The numerical simulations of the propeller cavitation were based on the Navier-Stokes equations solved with a mass transfer cavitation model, the k-omega SST turbulence model and a sliding mesh. The evolution of the unsteady cavitation and the pressure fluctuations around the propeller in the non-uniform flow are predicted fairly well compared to experimental results. The CFD results verify the connection between the pressure fluctuations and the changing cavitation patterns as the blades sweep through the high velocity wake region. Furthermore, to better demonstrate the physical mechanism of the cavity-generated pressure field, the cavity volume was calculated and analyzed to illustrate the relationship between the cavity evolution and the pressure fluctuations. The analysis shows that the acceleration due to the cavity volume changes is the main source of the pressure fluctuations excited by the propeller cavitation. These results demonstrate that this numerical methodology is suitable for simulating unsteady cavitating flows around a propeller. (C) 2012 Elsevier Ltd. All rights reserved.