空气动力学学报2012，Vol.30Issue(3)：394-399,6.
工程约束下基于自由曲面方法的机头气动修形设计
Aerodynamic design of forward fuselage using NURBS with engineering constraints
摘要
Abstract
Conic curve is mostly used in traditional aircraft design process due to its good geometric characteristics, but its ability of shape deformation is limited to its single control parameter, while flexible shape deformation is the main characteristic of NURBS (Non-Uniform Rational B-Splines) curve. According to the configuration layout and the ergonomic constraints in the aircraft design process, NURBS curves and surfaces are used to implement shape parameterization and to generate flexible geometries for the forward fuselage. spikes were proposed. Secondly, wind characteristics including wind profile, angle of attack, gradient height, turbulence intensity, gust facotr, time scale, length scale and power density spectra et. al, were carefully analyzed. The results show that the exponential index a of power law profile is less than the recommended value for onshore wind in load code for the design of building structures! the angle of attack induced by typhoon field is about 3°～7°; the 3s gust facotr is 1. 23 over sea surface; the longitudinal turbulence intensity is 0. 1 and the ratio among the three dimensional trbulence intensity is 1 : 0. 80 : 0. 43, the horizontal time scales are less than 30s and the vertical time scales are less than 10s; the length scales in both the two horizontal directions are nearly equal, but greater than the values in vertical direction; the field measured power density spectra follow von Karman spectral model better in contrast wity other empirical power spectral model.关键词
NURBS/单曲风挡/几何参数化/CFD/横向控制线Key words
typhoon/wind profile/wind attack angle/turbulence intensity/integral scale/wind spectra分类
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黄杉,宋文滨,周峰,汪君红,张美红..工程约束下基于自由曲面方法的机头气动修形设计[J].空气动力学学报,2012,30(3):394-399,6.基金项目
中国商飞上海飞机设计研究院项目(10GFZ-ZZX-017) （10GFZ-ZZX-017）
