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出于实际使用需求的考虑,运输机后体通常设计成上翘收缩的外形.这种外形会引起机身尾部出现比较强的负压区,使得飞机阻力大大增加.因此,通过运输机后体外形优化设计进行减阻是运输机减阻研究中重要的内容.选用典型上翘后体运输机的单独机身外形模型,采用外式张线天平测力和CFD数值模拟相结合的方法,分别研究了后体收缩比和后体上翘角两个主要的后体几何参数对阻力系数的影响.研究结果表明:阻力系数随后体收缩比的增大而增大,后体上翘角对阻力系数的影响与迎角相关;收缩比和上翘角对摩擦阻力系数影响较小,阻力系数的变化主要来源于收缩比和上翘角对压差阻力系数的影响;外式张线天平可以测量出后体参数变化引起的微小阻力差量,因此可以用于开展后体试验研究.
Due to the actual use requirements, the rear of the transporter is usually designed to upturned and contracted shape, which will lead to a strong negative pressure area at the rear of the fuselage, which greatly increases the resistance of the aircraft.Therefore, The design of drag reduction is an important part in the study of drag reduction.Selecting the typical fuselage profile model of typical upturned rear hull transporter, adopting the combination of the external tension balance measuring force and CFD numerical simulation, Shrinkage ratio and posterior body angle of the two main geometric parameters of the drag coefficient.The results show that: the drag coefficient increases with the increase of the body shrinkage ratio, the body back up angle on the drag coefficient and Angle of attack; shrinkage ratio and upturned angle on the friction coefficient of resistance is small, the drag coefficient mainly comes from the contraction ratio and up angle on the drag coefficient of resistance; external linear balance can measure the body parameters Change caused by the small resistance difference, it can be used to carry out post-mortem study.