跨音速翼型多参数多约束优化设计方法

本文通过采用EXTREM数值优化方法并基于求解全速势方程的跨音速粘流翼型计算方法, 研究发展了一种应用形状函数修形的跨音速翼型多参数多约束数值优化设计方法, 应用该方法可以从普通低速翼型和超临界翼型出发通过数值优化后得到在跨音速区阻力系数最小化的翼型几何外形。设计表明, 该方法具有收敛快、调用目标函数次数少等优点。 

EXPERIMENTAL RESEARCH ON AN APPARATUS FOR MEASURING ALFORD FORCE

Abstract A lateral destabilizing force (Alford force) emerges as a rotor of an axial turbomachinery is offset in relation to its case.Existence and mechanism of the Alford force have been verified and researched in literature.However it is very difficult to measure the stationary destabilizing forces and especially the rotational destabilizing forces for lack of an effective test apparatus and efficient measuring methods.As a result of investigation on the experimental measuring methods for years,a testing apparatus has been designed and established through several practical tests and improvements.Therefrom the destabilizing forces under various conditions are successfully measured.