旋转天平试验预弯接头干扰研究

目前国内现有的旋转天平试验装置都是使用弧形弯轨的方式，为了获得较大的迎角范围，都采用了预弯接头的设计。小迎角下，预弯接头正好处于模型的尾流区内，预弯接头会对模型的气动力和气动力矩产生一定干扰。本文基于FD-09低速风洞旋转天平试验系统，采用将预弯接头安装到对称的负角度并翻转模型的方法来开展预弯接头干扰试验研究。试验研究表明：在小迎角下，当预弯接头处于模型尾流区内时，预弯接头对模型纵向和横航向气动特性都有干扰；但是其干扰主要是引起气动特性曲线的平移，对旋转导数几乎没有影响。本文提出的将预弯接头安装到对称的负角度并翻转模型的干扰修正方法非常简便，可以为旋转天平试验开展预弯接头干扰修正研究提供一种方便快捷的试验方法。

Investigation on the interference of pre-bending support joint in rotary balance test

In order to get a wide range of angles of attack, pre-bending support joints were used in rotary balance test. The pre-bending support joint was located in the model wake region at low angle of attack. The pre-bending support joint can cause interference with aerodynamic force and aerodynamic moment of model. The test was carried out by installing the pre-bending support joint at a symmetrical negative angle and rotating the model by 180 degrees. The test results show: the aerodynamic characteristic of the SDM model were interfered by the pre-bending support joint, when the pre-bending support joint was located in the model wake region at low angle of attack. But the interference of pre-bending support joint mainly caused the translation of the aerodynamic characteristic curve, and the interference of pre-bending support joint had little effect on the rotation derivative. The interference correction method proposed in this paper is very simple, which can provide a convenient and fast test method for the research of interference correction of the pre-bending support joint in rotary balance test.