【作者】 陈怀壮；

【导师】 邓宗白；

【作者基本信息】 南京航空航天大学 ， 工程力学， 2008， 硕士

【摘要】 为了在现代空战中取得战场优势,在新型战斗机设计中采用高新技术提高改善现代战斗机的技术战术性能是十分必要的。本文根据某型发动机的特定工作条件,为某型发动机改装二元推力矢量喷管进行了改装设计,将发动机喷管设计成了由导流管、调节板和导流板三部分组成的一个喷管,该结构喷管结构简单,成本低,发动机改动少,使用方便,且系统的可靠性、可维修性很好,使用寿命也很高。本文利用有限元软件对设计喷管的各个组成部件进行了分析计算,分别得出了导流管、调节板和导流板的应力分布和位移分布特征。其中导流管的应力分布和位移分布跟传统的轴流式喷管大不相同,特别是最大位移的出现位置发生了很大变化,为此,本文对导流管局部部位进行了加厚处理,并对局部部位加装了加强框,经过局部加强框的加装和局部厚度的加厚,导流管的最大应力和最大位移分布得到改善,减小了导流管的最大应力值和最大位移值,并且,最大应力和最大位移出现的位置也发生了变化,通过改进方案的实施,导流管的结构能够胜任发动机出口气流的要求,满足飞机的安全要求。本文在设计导流板时考虑到飞机特定的工作状态,为了防止翼尖失速现象的出现,参照国外飞机二元推力矢量喷管的设计,将导流板设计成由三角形板和矩形板组成的导流板,并分别对不同宽度的矩形板和不同高度的三角形板的组合进行了分析计算,得到了导流板的最大应力和最大位移分布跟三角形高度和矩形宽度之间的关系,并根据这个关系提出了优化设计方案。更多还原

【Abstract】 In order to achieve the superiority in the air in the modern battlefield, It is very necessary for us to improve the technical and tactics capability of the fighter in the design.The paper designed a dual-engine thrust-vectoring nozzle based on a certain type of the specific working conditions of the engine, the engine nozzle design will be a compose of the conductance, adjust board and the control board. The nozzle structure is good at simple structure, low cost, small engine changes, easy-to-use, and the system’s reliability, high maintainability. The paper analysed the various components of the nozzle by using the finite element software and get the character of the composing part。The diversion of the displacement and the stress distribution is different with the distribution of traditional axial-flow nozzle, particularly the largest displacement of a great changes have taken place here。The paper dealing with a thicker and enhanced box on the diversion of local sites, the diversion of the maximum displacement and stress distribution has improved and reduced,the biggest stress and the maximum displacement position has also undergone a change, by improving the implementation of the programmer, the structure can meet the need of the engine on airflow and the safety requirements of the aircraft. This paper designed the control board as a diversion of the triangular and rectangular plates, to take into account the specific working conditions to prevent the emergence of the phenomenon wingtips stall, the United States aircraft reference to the dual thrust vectoring nozzle design。The paper analyse the control board composed of different width heights of the rectangular plates and triangular plate, get the greatest stress and displacement distribution of the control board, then we get the optimized design .更多还原