翼身融合布局缩比模型飞行试验动力影响分析

动力系统的进排气效应是影响翼身融合布局飞机俯仰力矩特性和全机纵向配平的重要因素。为了研究动力对全机俯仰力矩的影响,基于飞行动力学方程,提出了一种动力影响计算方法。以某翼身融合布局缩比模型为研究对象,结合风洞试验数据,分析了模型飞行试验中爬升段、平飞段和下降段动力对全机俯仰力矩系数的影响,同时计算了迎角测量误差对俯仰力矩计算结果的影响。分析结果表明:动力使该翼身融合布局缩比模型低头力矩增加,会对全机纵向配平产生不利影响;迎角测量精度对俯仰力矩计算结果有较大影响。

Analysis of engine powered effect on scale model flight test of blended wing body layout

The inlet and exhaust effect of engine influenced the pitching moment and longitudinal trim of blended wing body layout.In order to analyze the pitching moment variation caused by inlet and exhaust effect,this paper presented a method which could get the engine powered effect based on flight dynamics equation.Scale model of blended wing body was taken as the research object,combing with wind-tunnel experimental data,the variation of pitching moment coefficients influenced by engine powered effect in climbing section,level-flight section and descending section during model flight test were calculated.Meanwhile,the influence of angle of attack measurement error on calculation results of pitching moment was carried out.The results indicate that engine increases the pitching down moment,which is not beneficial to longitudinal trim;measurement accuracy of angle of attack has certain impact on calculation results of pitching moment.