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首页> 外文会议>ICAM 2012 >Influence Analysis of Blade Fracture on Hydrodynamic Performance of Ducted Propellers Based on CFD
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Influence Analysis of Blade Fracture on Hydrodynamic Performance of Ducted Propellers Based on CFD

机译：叶片骨折对基于CFD的管道螺旋桨流体动力学性能的影响分析

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The numerical model of the unsteady flow field of ducted propellers is based on CFD (computational fluid dynamics). By applying the numerical model, the unsteady hydrodynamic performance of the ducted propeller with the fracture at different positions of a certain blade is numerically analyzed under three different wake current fields. Based on regress analysis, the relationships between the mean K_Q, mean K_T and the quantity of the blade fracture of ducted propellers are obtained; and the relationships between hydrodynamic coefficients K_p, K_Q, K_(Fy) (Bearing force coefficient of the propeller) and wake current fields, the quantity of the blade fracture are respectively further analyzed. The results show that: (1) with the increase of the quantity of the blade fracture, the amplitude of bearing force periodic variation of propellers increases, while the thrust and torque reduce; (2) the bearing force of propellers is similarly sine-varying, and the frequency of its variation is unrelated to the normal variation frequency of the wake current field. The more non-uniform the wake current field is, the more the amplitude of its periodic variation is; (3) the thrust and torque of propeller are similarly sine-varying, and the frequencies of their variation are related to the normal variation frequency of the wake current field. And the frequencies equal the shaft frequency multiplied the normal variation frequency of the wake current field. The more non-uniform the wake current field is, the more the amplitude of their periodic variation is.
机译：管道螺旋桨的非定常流场的数值模型基于CFD（计算流体动力学）。通过施加数值模型，在三个不同的唤醒电流场下进行数值分析在某个叶片的不同位置处的裂缝的不稳定流体动力学性能。基于回归分析，获得了平均值K_Q，平均K_T和管道螺旋桨叶片骨折数量之间的关系;并且流体动力系数K_P，K_Q，K_（FY）（螺旋桨的承载力系数）之间的关系和唤醒电流区域，进一步分析了叶片骨折的量。结果表明：（1）随着叶片断裂量的增加，螺旋桨的轴承力周期变化的幅度增加，而推力和扭矩减少; （2）螺旋桨的轴承力类似地是正弦变化的力，并且其变化的频率与唤醒电流场的正常变化频率无关。唤醒电流场的不均匀是，其周期性变化的幅度越多; （3）螺旋桨的推力和扭矩是类似的正弦变化，并且其变化的频率与唤醒电流场的正常变化频率有关。并且频率等于轴频率乘以唤醒电流场的正常变化频率。唤醒电流场的不均匀是，它们的周期性变化的幅度越多。

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