Vortex Dynamics Analysis of Straight-Body-Type-Fuselage Fighter Using CFD Simulation

ABSTRACT: The choice for using a fighter fuselage in a fighter jet design affects a vortex generation advantageous in maneuverability. To study the effect of straight-body-type-fuselage (SBTF) on the vortex dynamic, a computational fluid dynamics (CFD) method is used, in order to simulate a model of SBTF fighter. The simulation uses Q-criterion to probe vortices, and a logarithmic grid to emphasize the micro-gridding effect of the turbulent boundary layer. The results show detailed quantitative velocity, pressure, trajectory of the vortex core, and wing negative surface pressure distribution (SPD), providing clear pictures of opportunity for performance improvement, better lift, agility, and maneuverability of a fighter if a model requires a new design.摘要：在战斗机设计中选用机身构型，会对有利于提升机动性的涡流生成效果产生影响。为研究直身型机身（straight-body-type-fuselage, SBTF）对涡流动力学的影响，本文采用计算流体动力学（CFD）方法对直身型机身战斗机模型开展数值模拟。本次模拟采用Q准则对涡流进行探测，并使用对数网格以强化湍流边界层的微网格划分效果。研究结果给出了涡流核心的速度、压力及轨迹的详细定量数据，同时提供了机翼表面负压分布（SPD）的相关信息，可为战斗机新构型设计提供清晰的性能优化方向，助力提升其升力、敏捷性与机动性。