共轴刚性旋翼桨毂阻力特性试验研究

为研究高速直升机共轴刚性旋翼桨毂的阻力特性,采用自研的桨毂模型试验台,在中国空气动力研究与发展中心FL-14风洞开展了风洞试验。试验模型为典型的共轴刚性旋翼桨毂模型,包括上、下桨毂整流罩模型和4种中间轴整流罩模型,分别为基准中间轴和基于翼型的优化外形。主要试验内容包括多种桨毂模型在不同转速、不同风速及不同模型姿态角下的阻力特性试验,以及桨根对桨毂阻力特性的影响试验等。风洞试验结果较好地反映了不同桨毂构型的阻力特性差异,获得了中间轴整流罩外形对桨毂阻力的影响规律;试验结果表明最优桨毂构型相对基准桨毂构型,可减阻37%。

Experimental Investigation of Coaxial Rotors Hub Drag Characteristics

A full-scale wind tunnel tests have been conducted to investigate the rotor hub drag characteristics of a coaxial rigid rotor through a rotor hub test rigin China Aerodynamics Research and Development CenterFL-14 wind tunnel. The test modelsare typical coaxial rigid rotor hub models, including the upper and lower hub fairing models and four intermediate shaft fairing models. There are four interchangeable mid-shaft fairings designed, i.e. , three optimized fairings based on airfoil shape , and a bare shaft for reference. Multiple fairing geometries are tested at different rotational speeds, wind velocity and different attitude angle in wind tunnel to obtain basic aerodynamic loads. The effect of blade stub on drag of rotor hub is also analyzed. Drag characteristics between three fairings and bare shaft are compared, and the influence law of coaxial rotors hub drag is obtained. The experimental results show that the best fairing configurationreduces the drag from a bare hub by 37%.