直航和回转工况下吊舱推进器水动力性能数值计算方法研究

Numerical Study on Hydrodynamic Performance of Podded Propulsor in Straight Forward and Steering Conditions

关键词:  吊舱推进器  水动力性能  直航工况  回转工况  数值计算

Key words:  Podded propulsor  Hydrodynamic performance  Straight forward condition  Steering condition  Numerical study

摘要:

为了探索吊舱推进器在回转工况下的水动力性能变化规律，采用全结构化网格离散计算域，基于RANS方法结合SST[k-ω]湍流模型和滑移网格技术计算了吊舱推进器在直航和回转工况下的水动力性能，并与试验数据进行了对比，进一步详细分析了螺旋桨和吊舱之间的相互干扰作用。结果表明，RANS方法结合全结构化网格可以较精确地预报直航和回转工况下的水动力性能，设计工况下计算值与试验数据的偏差在[±3%]以内；由于螺旋桨与吊舱之间的强烈相互干扰作用，吊舱桨的瞬时推力系数和扭矩系数成周期性变化，波动频率与桨叶数相等；直航状态下，吊舱桨的推力系数和扭矩系数最小，其值随回转角的增大而增大；而吊舱单元的推力系数随回转角的增大而减小；吊舱单元的横向力系数最小，基本上为0，其值随回转角的增大而迅速增大。

Abstract:

In order to investigate unsteady hydrodynamic performance of podded propulsor in steering condition，structured grids were generated to discretize the flow domain，hydrodynamic performances of podded propulsor in straight forward and steering conditions were numerically solved by RANS method combined with SST[k-ω] turbulence model and moving mesh technique. Comparisons were made between numerical results and experimental data，and the interaction between propeller and pod was analyzed in detail. It shows that RANS method combined with structured grids can predict well on hydrodynamic performances of podded propulsor in straight forward and steering conditions，the error between numerical result and experimental data is below [±3%]in design condition. The transient thrust and torque coefficients of podded propeller vary periodically with phase angle due to the interaction between propeller and pod，and the frequency is equal to propeller blade number in a period. In straight forward condition，thrust and torque coefficients of podded propeller are minimum and increase with the increase of steering angle. The thrust coefficient of the podded unit decreases with the increase of steering angle. The transverse force coefficient increases significantly with the increase of steering angle.