The deep - stall characteristics of different aircraft configurations are analyzed with bifurcation analysis methods , and the convergence regions of a deep - stall attractor are constructed with backward integration techniques 摘要用分支分析方法分析了不同構(gòu)型飛機(jī)的深失速特性,用反向積分技術(shù)計(jì)算了深失速吸引子的吸引域。
3 . the characteristics of boundary layer ' s transition , shape and separation are researched . the details as follows : ( l ) airfoil surface is turbulent boundary layer flows ; ( 2 ) velocity figure changed unsteady near the point of boundary layer separation due to randomicity of turbulent flow ; ( 3 ) the airfoil have better state of boundary layer separation and poor stall characteristics because of the upper surface of airfoil is flat 給出了該翼型的附面層特性:翼型表面基本為湍流附面層;在靠近附面層分離位置處,速度型形狀、特別是靠近翼型表面的底部速度型形狀變化不定,是湍流流動(dòng)的隨機(jī)性所致;該翼型具有較好的附面層分離形態(tài),但在失速迎角附近,附面層分離形態(tài)變化劇烈、失速特性差,是翼型上翼面形狀較為平坦所致。