一种涵道螺旋桨的简便设计方法

由于涵道和螺旋桨互相干扰的复杂性，通常涵道螺旋桨的设计需要较多经验和较长时间。提出一种将动量定理、轴流式通风机相似理论和旋转机械叶素理论相结合的工程方法，该方法应用在涵道螺旋桨初步设计阶段，可快速确定桨叶和涵道初始外形。首先根据动量理论计算通过桨盘的流量，再由轴流通风机相似理论确定桨盘直径与轮毂比，然后运用叶素理论设计桨叶的几何形状。风洞实验结果表明：该设计方法实用、有效，从而可以加快涵道螺旋桨设计过程。

A Simple Approach to the Design of Ducted Propeller

Ducted propeller design is often by rule of thumb, and requires a long time for the complexity of the mutual interaction between duct and propeller. A simple method, which is combined with momentum theory, the axial fan similarity and the blade-element theory, is proposed for the purpose of designing the blades and duct during ducted propeller preliminary design stage. First, the mass flow through the propeller disk is calcu- lated using the momentum theory. Then the fan diameter and hub diameter are estimated by similarity of axial fan introduced by the authors. Finally the blade primary geometry is designed on the basis of blade element the- ory. To verify feasibility of this method, a ducted propeller is manufactured and tested in NF-3 low speed wind tunnel. The result shows that the method is useful and effective, and can accelerate ducted propeller design pro- cedure.