基于Fine/Marine的PC456桨水动力数值模拟

Numerical simulation of hydrodynamic performance of PC456 propeller based on Fine/Marine

  • 摘要:
    目的 旨在研究自行设计的空化桨模PC 456在斜流中的水动力及空化流场特性。
    方法 采用商用软件Fine/Marine中集成的ISIS-CFD求解器,结合 SST k-\omega 湍流模型和Schnerr-Sauer空化模型,利用滑移面网格技术进行数值模拟。首先,将标准桨模DTMB 4119在无空化均匀流条件下的敞水性能模拟结果与实验数据进行对比,并对 4 套网格进行无关性验证,验证本文所建立数值模型的精度;然后,对PC456桨的敞水性能进行预报,并应用 Schnerr −Sauer 空化模型对其进行均匀来流以及不同斜流条件下的空化数值模拟。
    结果 结果表明,斜流会对空化桨模PC 456的水动力造成干扰,一方面表现在斜流造成的单桨叶推力系数和扭矩系数在不同位置的波动;另一方面表现在斜流对螺旋桨空化产生影响,进而对性能产生不同程度的扰动。
    结论 研究表明,螺旋桨倾斜角越大,桨叶在不同位置推力系数和扭矩系数的波动越大;而螺旋桨空化使两个倾角下的推力系数和转矩系数都出现了不同程度的扰动,且扰动的程度与空化面积并不成正比。

     

    Abstract:
    Objective The purpose of this paper is to study the hydrodynamic and cavitation flow characteristics of the self-designed cavitation propeller model PC 456 in oblique flow.
    Methods The numerical solution was solved using the ISIS-CFD solver integrated in the commercial software Fine/Marine, combined with turbulence models and Schnerr−Sauer cavitation models, and used sliding surface mesh technology for numerical simulation. First, the open water performance simulation results of the standard blade model DTMB 4119 under non cavitation uniform flow conditions were compared with experimental data, and the independence of four sets of grids was studied to verify the accuracy of the numerical model established in this paper. Then, the open water performance of the PC 456 propeller was predicted, and the Schnerr−Sauer cavitation model was applied to simulate its uniform inflow and cavitation under different oblique flow conditions.
    Results The results indicate that oblique flow can interfere with the hydrodynamic performance of propeller model PC 456. On the one hand, it is manifested in the fluctuation of single blade thrust coefficient and torque coefficient caused by oblique flow at different positions; On the other hand, it is manifested in the influence of oblique flow on propeller cavitation, which in turn causes varying degrees of disturbance to performance.
    Conclusions The larger the inclination angle of the propeller, the greater the fluctuation of the thrust coefficient and torque coefficient of the blade at different positions; However, propeller cavitation causes varying degrees of disturbance in both thrust and torque coefficients at two different inclinations, and the degree of disturbance is not directly proportional to the cavitation area.

     

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