Investigations on a dynamic forebody flow control system
Investigations on a dynamic forebody flow control system
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DOI：
10.1109/iciasf.1999.827168
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发表时间：
1999-06
期刊：
影响因子：
--
通讯作者：
E. Hanff;R. Lee;R. Kind
中科院分区：
文献类型：
--
作者：
E. Hanff;R. Lee;R. Kind
本文提出了一种新的方法，用于高性能飞机在大迎角飞行过程中前体涡的动态操纵，以便在常规操纵面的操纵能力由于严重的流动分离而急剧下降时，提供增加的横向操纵性。该方法利用了前体涡固有的非线性特性，有意地使它们在两种稳定状态之间高频切换。两个前向喷嘴交替吹气的占空比调制用于控制平均横向气动力和力矩。一系列关于拱形圆柱体和飞机布局示意图的风洞和水洞试验表明，通过适当地放置喷管，可以获得占空比和平均操纵载荷之间的线性关系，从飞行控制的观点来看，这是一个非常理想的特性。
A novel method is proposed for the dynamic manipulation of forebody vortices of high-performance aircraft during flight at high incidence to provide increased lateral controllability when the control authority available from conventional control surfaces is dramatically degraded due to severe flow separation. The method takes advantage of the inherently bistable nature of the forebody vortices by deliberately switching them between their two stable states at a high frequency. Duty cycle modulation of the alternating blowing from two forward facing nozzles is used to control the mean lateral aerodynamic forces and moments. A series of wind- and water-tunnel experiments on ogive-cylinders and a schematic aircraft configuration have shown that by appropriately placing the nozzles, it is possible to obtain a linear relationship between duty cycle and mean control load, a highly desirable characteristic from a flight control point of view.