气动外形光顺及其对气动力数值模拟效果的影响

 对飞行器及其部件进行气动力数值模拟时,气动外形常常是以离散数据形式给出。若外形的~、二阶导数不能保持连续且光滑就称其为不光滑表面。为解决由此带来的问题,用总体光顺方法(包括横轴转换、分段最小二乘多项式和最小二乘三次样条技术)和基于加权方式的局部光顺方法对不光滑表面进行光滑化处理。经光滑处理后可改善气动外形的几何特性,进而改善气动力数值模拟的效果。

AERODYNAMIC SHAPE SMOOTHING AND ITS INFLUENCE ON THE EFFECT OF AERODYNAMIC NUMERICAL SIMULATION

When aerodynamic numerical simulation for flight vehicle and its components is conducted, the aerodynamic shape is generally given in the manner of discrete data. It is called an unsmooth surface if its first and second derivatives can't be both continuous and smooth. In order to resolve the problems caused by this phemomenon, the overall smoothing method based on x-axis transformationm, piecewise least-squares polynomial and least-squares cubic spline techniques and the local smoothing method based on weighting procedure are used to smooth the unsmooth surface. These methods improve the geometric characteristics of the aerodynamic shape first, and then improve the effect of the aerodynamic numerical simulation.