INDICIAL LIFT APPROXIMATIONS FOR 2-DIMENSIONAL SUBSONIC FLOW AS OBTAINED FROM OSCILLATORY MEASUREMENTS

被引：55

作者：

LEISHMAN, JG

机构：

[1] University of Maryland at College Park, Department of Aerospace Engineering, College Park, MD

来源：

JOURNAL OF AIRCRAFT | 1993年 / 30卷 / 03期

关键词：

D O I：

10.2514/3.46340

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

An approach is described to obtain generalized approximations to the indicial lift response due to angle of attack and pitch rate in two-dimensional subsonic flow. Starting from an assumed representation, the approximations are accomplished by means of a nongradient optimization algorithm in which the coefficients of the approximation are free parameters. The optimization is subject to prescribed constraints in terms of the known initial and asymptotic behavior of the indicial response, and by requiring the response duplicate the known exact (analytic) solutions at earlier values of time. The approach is applied to extract the intermediate forms of the indicial lift response, generalized in terms of Mach number and pitch axis location, from experimental measurements of the unsteady lift in the frequency domain.

引用

页码：340 / 351

页数：12

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