影响导管桨内部流场的几个因素

用理论方法计算导管桨的内部流场，研究几个重要因素对内部流场的影响，以期获得导管桨内部的流体运动规律．用迭代方法分析螺旋桨和导管的相互影响，迭代计算结束后求解螺旋桨和导管表面的偶极强度和源汇强度，根据蒙瑞诺公式计算螺旋桨和导管的诱导速度，即可得到导管桨的内部流场．以面元法为数值求解方法，编制计算程序，研究影响导管桨内部流场的几个因素，包括螺旋桨的盘面比、叶数和导管的形状、位置．结果表明，上述参数对螺旋桨内部流场的大小和周期均有很大的影响．

Several Influence Factors for the Inner Flow Field of Ducted Propeller

The inner flow field of ducted propeller was calculated using theoretical method; several factors that influence the inner flow field were studied to obtain the movement regulation of inner liquid of ducted propeller. An iterative method was used to analyze the interaction between duct and propeller. The doublet and source strength on the surface of propeller and duct were solved with iterative calculation. Morino formula was used to calculate the induced velocities of propeller and duct,and so to achieve the inner flow field of ducted propeller. The panel method was taken as the numerical calculation method, and numerical program was compiled. Several factors that influence the inner flow field of ducted propeller were studied,which include the expanded area ratio,blade numbers of propeller,and shape and location of the duct. Results show that the above parameters have great influence on the magnitude and periodicity of the inner flow field of propeller.