冰阻塞参数对螺旋桨水动力性能影响试验研究

针对冰水混合环境下冰阻塞逼近效应对螺旋桨水动力性能影响,在空泡水筒开展了均流和冰阻塞条件下的螺旋桨模型水动力性能试验,测试了冰桨轴向、垂向间距等冰阻塞参数对不同运行工况的螺旋桨模型水动力性能影响。试验结果表明,冰阻塞物一方面改变流场特征直接影响螺旋桨模型推力和扭矩,另一方面改变桨叶的空泡特性进而影响水动力性能。在无空化状态,随着垂向和轴向阻塞逼近程度的加深,在冰阻塞环境螺旋桨模型推力系数相比于均流可产生40%和20%的增加;而在桨叶严重空泡的重载状态,螺旋桨水动力随冰桨间距的变化不明显,桨叶的空泡效应减缓了冰阻塞效应的影响程度。

Experimental research on the influence of ice block parameters on propeller hydrodynamic performance

Aiming at the influence of ice blockage proximity effect to propeller hydrodynamic performance in ice-water mixed environment, hydrodynamic performance experiment of model propeller in uniform flow and ice blocking condition are carried out in the cavitation tunnel.In the experiment, the influence of ice-propeller vertical distance, axial distance and other block parameters on propeller hydrodynamic perfor-mance is tested.Test results show that ice blockage affects thrust and torque of model propeller directly by changing the feature of flow field.On the other hand, it can change cavitation characteristics of blade to affect propeller hydrodynamic performance.In no cavitation condition, with the deepening of vertical and axial block proximity, thrust coefficient of model propeller can rise by 40% and 20% in ice blocking envi-ronment than in uniform flow.But in the serious cavitation of heavy load condition, the change of propeller hydrodynamic performance with ice-propeller distance is not sensitive, while the blade cavitation phe-nomenon may reduce the extent of ice blockage proximity effect.