Flap Vortex Management Using Active Gurney Flaps
Flap Vortex Management Using Active Gurney Flaps
复制标题
使用主动轮床襟翼进行襟翼涡流管理
作者：
D. Greenblatt;S. Vey;O. Paschereit;R. Meyer
进行了一项试验研究，以评估有限翼展Gurney襟翼改变具有商用飞机翼型和增升系统（缝翼和襟翼）的后掠等弦半模型襟翼边缘涡特性的适用性。所采用的策略是基于众所周知的翼展载荷和尾流之间的涡卷关系，该关系被扩展和修改以包括有襟翼的机翼构型。研究的第一阶段包括安装在后缘和襟翼边缘的静态Gurney襟翼的试验，其中对不同的襟翼高度和襟翼翼展分数进行了评价。数据采集包括襟翼边缘下游的粒子图像测速测量、六分量载荷测量以及主元件和襟翼边缘区域的表面压力测量。Gurney襟翼使涡心产生显著的变化，达到半翼展的5.3%（弦长的13.1%），而相应的升力和阻力系数变化很小。研究的第二阶段涉及评价动态展开的Gurney襟翼，其中相位平均粒子图像速度测量法测量襟翼后的涡流。这是出于周期性扰动涡心的愿望，目的是激发尾流不稳定性，从而引发更快的衰减。当驱动Gurney襟翼，从而在比翼展短或长的波长上扰动涡时，涡心的权威性没有实质性的改变。
An experimental study was conducted to assess the applicability of limited-span Gurney flaps for altering the flap-edge vortex characteristics of a swept constant-chord half-model with a commercial aircraft airfoil and high-lift system (slat and flap). The strategy employed was based on the well-known vortex roll-up relations between the span loading and the wake that were extended and modified to include configurations with flapped wings. Phase I of the study involved the testing of static Gurney flaps mounted at the trailing edge and flap edge, in which different flap heights and fractions of flap span were evaluated. Data acquisition included particle image velocimetry measurements downstream of the flap edge, six-component load measurements, and surface pressure measurement on the main element and in the flap-edge region. The Gurney flaps produced significant variation of the vortex centroids, up to 5.3% of the semispan (13.1% of chord), with corresponding small changes to lift and drag coefficients. Phase II of the study involved the evaluation of dynamically deployed Gurney flaps, in which phase-averaged particle image velocimetry measurements were made of the vortex trailing the flap. This was motivated by the desire to periodically perturb the vortex centroids, with a view to exciting wake instabilities and thus triggering a faster decay. When driving the Gurney flap and hence perturbing the vortices at wavelengths shorter or longer than the wingspan, the authority over the vortex centroids did not materially change.