摘要
椭球形整流罩产生较大的空气阻力,限制了精确制导武器的作战性能。以减小空气阻力为主要目标,针对二次曲面共形光学整流罩进行研究,设计综合性能较为完善的整流罩面型。应用计算流体力学方法,计算了共形整流罩的空气阻力系数,建立了共形整流罩空气阻力评价函数。基于光线追迹理论,以不同目标视场下的平均波前误差作为像质评价指标,构建了共形整流罩像质评价函数。以雷达散射理论为基础,计算了整流罩的雷达散射截面积,给出了共形整流罩雷达散射特性评价函数。结合空气阻力、光学成像质量和雷达散射特性,建立了二次曲面共形整流罩综合性能评价函数,确立了长径比为1.5的抛物线型整流罩具有较好的综合性能。相比椭球形整流罩,该抛物线形整流罩减少了约1/3的空气阻力。
The ellipsoidal domes generate huge air resistance, which limits the operational performance of precise guided weapons. To reduce the air drag, the conicoidal conformal optical domes are investigated and a better surface shape of the dome is designed. The computational fluid dynamics method is adopted to compute the drag coefficients produced by the conicoidal conformal optical domes. The evaluation function of the drag coefficient is established. Based on the ray tracing theory, the evaluation function of imaging quality of conformal domes is modeled by putting the average root mean square wavefront errors of different fields of regards to the evaluation parameters. Based on the radar scattering theory, the radar scattering cross sections of conformal domes are computed. The evaluation function of radar scattering property is established. Taking the air resistance, imaging quality and radar scattering property into account, the evaluation function of comprehensive performance of the conicoidal conformal optical domes is established. The parabolic dome with the fineness ratio of 1.5 is proved to possess better comprehensive performance. Compared with the ellipsoidal dome, the parabolic dome established in this paper just produces 2/3 air resistance of the ellipsoidal dome does. conformal optics; dome; conicoidal surface
出处
《光学学报》
EI
CAS
CSCD
北大核心
2014年第12期257-262,共6页
Acta Optica Sinica
基金
国家自然科学基金面上项目(61275020)
航空科学基金(20130177003)
