摘要
针对大展弦比太阳能无人机的性能要求,开展碳纤维复合材料太阳能无人机机翼的优化设计。选用NACA4412为基准翼型,利用xfoil软件作为气动计算软件,基于NSGA-Ⅱ优化算法进行翼型优化。在此基础上对机翼进行三维建模,采用CFD软件进行气动特性分析,并利用ANSYS Workbench静力学模块对机翼进行流固耦合分析。结果表明:翼型优化后,升力系数提高4.20%,阻力系数降低8.74%,升阻比提高14.18%;在气动载荷作用下,从翼根向翼尖方向压力逐渐增大,翼尖处最大压力相对外界大气压力为242 Pa;在外载荷作用下,最大应力显示在翼根附近,为61.397 MPa,翼变形的最大值为40.262 mm,整体满足太阳能无人机的允许变形量在5%以内即翼尖变形不得大于半翼展长度值的5%的刚度要求。研究结果可为碳纤维复合材料太阳能无人机设计和研制提供理论参考。
Aiming at the performance requirements of solar UAV with high aspect ratio,the optimization design of the carbon fiber composite solar UAV wing was carried out in this paper.When NACA4412 was selected as the reference airfoil,the airfoil was optimized based on NSGA-Ⅱoptimization algorithm with xfoil software as the aero-dynamic calculation software.On this basis,the three-dimensional modeling of the wing was carried out,the aero-dynamic characteristics are analyzed using CFD software,and the fluid-structure coupling analysis of the wing was carried out using the ANSYS Workbench statics module.The results show that the lift coefficient increases by 4.20%,the drag coefficient decreases by 8.74%and the lift-drag ratio increases by 14.18% after the airfoil is op-timized.Under the aerodynamic load,the pressure increases gradually from the wing root to the wing tip,and the maximum pressure at the wing tip is 242 Pa relative to the external atmospheric pressure.Under the action of exter-nal load,the maximum stress is displayed near the wing root,which is 61.397 MPa,and the maximum value of wing deformation is 40.262 mm,which meets the rigidity requirement that the allowable deformation of solar UAV is within 5%,that is the wing tip deformation shall not be greater than 5% of the half-span length.The research re-sults can provide a theoretical reference for the design and development of carbon fiber composite solar UAV.
作者
苏桐
胡果馨
刘振
SU Tong;HU Guoxin;LIU Zhen(School of Physics,Xi’an Jiaotong University,Xi’an 710049,China;School of Aeronautics and Astronautics,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《复合材料科学与工程》
CAS
北大核心
2024年第3期79-83,共5页
Composites Science and Engineering
