Aerodynamics of Gurney flaps on a wing in ground effect
Aerodynamics of Gurney flaps on a wing in ground effect
复制标题
DOI：
10.2514/2.1396
复制
发表时间：
2001
期刊：
影响因子：
2.5
通讯作者：
Jonathan Zerihan;Xin Zhang
中科院分区：
文献类型：
--
作者：
Jonathan Zerihan;Xin Zhang
对地面效应下装有Gurney襟翼的单元件增升机翼进行了研究。在气动性能和流场特性方面，对Gurney的影响进行了量化。结果是直接相关的航空和赛车应用。Gurney在地面效应中的定性性能与自由起落相比;机翼的法向力增加，失速更剧烈。用激光多普勒测速仪研究了Gurney对机翼后湍流尾迹特性的影响。采用粒子图像测速技术研究了Gurney后的非定常流场，其特征是一条交替脱落的、远离地面的离散涡。当吸力面后缘气流开始分离时，地面效应失速机制和非定常尾迹产生，气动性能恶化。
A study was performed of a single-element, high-lift wing fitted with Gurney flaps in ground effect. The effect of the Gurney has been quantified in terms of aerodynamic performance and flow field characteristics. The results are of direct relevance to both aeronautical and racing car applications. The qualitative performance of the Gurney in ground effect compares with freestream; the normal force of the wing is increased and a sharper stall results. Laser Doppler anemometry was used to investigate the effect of the Gurney on the turbulent wake characteristics behind the wing. Particle image velocimetry was employed to elucidate the unsteady flow behind the Gurney, which is characterized by a street of alternately shedding, discrete vortices away from the ground. When flow starts toseparate from the trailing edge of the suction surface, the stall mechanism in ground effect, an unsteady wake results and the aerodynamic performance deteriorates.