【摘要】 基于多层快速多极子方法和有限体积法，建立了两侧进气S弯进气道的电磁散射和气动仿真模型，对其雷达散射截面(RCS)和气动特性进行了数值研究。对比分析了进口形状和偏距这两个主要几何参数对进气道RCS和总压恢复系数的影响规律。仿真结果表明，(1)等边三角形进口的进气道隐身性能较好，RCS随偏距减小；(2)梯形进口进气道的隐身性能对极化方向较为敏感，偏距以刚好遮挡发动机为宜；(3)进口形状对气动性能的影响大于偏距的影响，梯形进口进气道气动性能优于三角进口，但差别不大；(4)综合比较气动和隐身性能，等边三角形进口进气道最优，适当增加偏距可以以较小的气动损失大大提升隐身性能。更多还原

【Abstract】 Electromagnetic scattering and aerodynamic simulation models for the side-mounted S-shaped inlet were built respectively based on the multilevel fast multipole method(MFLMM) and finite volume method. The influence of two main geometric parameters, inlet shape and offset, on the inlet RCS and total pressure recovery coefficient was compared and analyzed. The results show that: The inlet with equilateral triangle intake exerts better stealth performance, and its RCS decreases with offset. The inlet with trapezoidal intake gets better stealth performance when the terminator is just covered by the smallest offset, and its RCS is sensitive to the direction of polarization. The Influence of intake shape on aerodynamic performance is greater than that of the offset. The inlet with trapezoidal intake exerts better aerodynamic performance than triangular inlet, and the difference is small. Considering both aerodynamic and stealth performance, the inlet with equilateral triangle intake is better. By increasing its offset, the stealth performance can be greatly improved with less aerodynamic loss.更多还原