局部粗糙机翼表面气动特性影响研究

摘要

采用柱型粗糙元,以尖劈和机翼外形为基础,利用CFD数值模拟方法,研究机翼表面局部粗糙区域对其周围气动特性的影响.研究相同粗糙元高度下,粗糙元位于尖劈表面不同位置时局部边界层和气动特性的变化情况;基于流动分区理论,采用空气动力学理论分析与数值模拟结合的方法,分析F16机翼可接受的局部粗糙元高度;根据分析结果,在改进平板外形基础上,验证不同粗糙元高度对改进目标块区域气动特性的影响程度,并给出流经局部粗糙区域的流体发展状况.为了验证数值结果的准确性,采用S-A与SST湍流模型进行对比求解.本文工作对复杂大气环境引起的飞行器局部粗糙表面区域气动特性变化的研究具有指导意义.%Base the shape of wedge and wing,the CFD numerical simulation method is adopted to study the variation of the aerodynamic characteristics and boundary layer when the rough strip at different situations of the wedge surface with the same thickness,the roughness element in the paper is trip disk.For the F16 wing,the theoretical analysis and numerical simulation is combined to analyze the aerodynamic characteristics of wing which with rough strip and find the acceptable height of roughness element.According to the analyzing results,based on the improved shape of flat plate,the influence degree of the aerodynamic characteristics of objective bulk will be found for different rough strip thickness,the fluid development condition of local rough region can be got.To validate the veracity of the numerical simulation,the results of S-A and SST model are compared in this paper.The paper work has directive significance to the variation of the aerodynamic characteristics of the local rough surface that the roughness is caused by complicated atmospheric environment.