一种新型转捩技术在跨音速风洞中的应用

针对传统金刚砂粗糙带在跨音速增压风洞实验中易脱落、随机误差大等问题,设计一种新型斑点型粗糙带,解决了大动压条件下,在模型表面实现固定转捩的问题。应用萘升华流动显示技术,分析了固定转捩和自由转捩条件下边界层变化情况;由测力实验得到GBM-01(AGARD-B)标准模型不同Ma数下的气动特性, 并与国外大风洞实验数据进行了比较。实验结果表明：新型斑点型粗糙带能够将层流边界层转变为湍流边界层,可以获得具有高雷诺数特点的数据,且强度高,是一种具有广阔应用前景的新型转捩技术。

Application of a New Transition Technology in Transonic Wind Tunnel

Aiming at the problems emerged in experiment of fixed transition on model surface under high dynamic pressure due to the traditional emery rough strip in transonic wind tunnel, such as is easy torn and peeled, large random errors, etc., a new spot pattern rough strip was designed. Sublimation flow visualization technique was used to check the effect of the new rough strip on transition, difference between the natural free transition and the artificial fixed transition was analyzed. At the same time, aerodynamic coefficients were measured for the GBM-01 (AGARD-B) calibration model and compared with that measured in other large-size wind tunnels. Result show that new spot pattern rough trip can trigger the boundary layer transition from laminar to turbulent one and can obtain aerodynamic results, which are comparable to that obtained under high Reynolds number atmospheric flight condition. At the same time, the new strip has high strength. So this is a new transition technology with wide prospective applications.