用解耦挂架抑制机翼/外挂颤振的低速风洞试验研究

A Study on Low Speed Wind Tunnel Test of Wing/Store Decoupler Pylon Flutter Suppressor

进行了用解耦挂架抑制机翼/外挂颤振的低速风洞试验研究。试验分别在二元机翼及大展弦比机翼颤振模型上进行。试验结果表明:机翼/固接外挂颤振速度低于单独机翼颤振速度;而当外挂俯仰频率落入柔性区范围时,机翼/铰接外挂颤振速度高于单独机翼颤振速度,且其颤振速度对外挂惯性特性的变化比较不敏感。试验结果还表明:阻尼对用解耦挂架抑制机翼/外挂颤振的效果有重要影响。阻尼过小时,可能发生以外挂模态为主的颤振,使颤振速度降低。文中还讨论了外挂铰点弦向、展向位置的影响。同时进行了相应的理论计算,计算结果与试验结果基本相符。

A study on low speed wind tunnel test of wing/store decoupler pylon flutter sttppressor is carried out.The tests are conducted both on a two-dimensional wing model and on a large aspect ratio wing model.The test results show that the flutter speed with rigid mounted store is lower than that glean wing's.In contrast to that,the flutter speed of the wing with the decoupler pylon mounted store is higher than that of the clean wing and is insensitive to the variation of inertia of the store when the store pitch frequency lies in the soft region.The testresults also show that the damper has a considerable influence on the effect of wing/store decoupler pylon flutter suppressor.If the damping coefficient of the damper is too low,a store-mode flutter may possibly appear,so that the flutter speed is decreased. The influence of other parameters is also discussed,such as the chordwise and spanwise location of the store pivot.A corresponding theoretical caleulation is also given,the results of which is in good agreement with that of the test.