低速全模颤振试验悬挂支撑系统
Floating suspension system for full model flutter tests at low speed
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摘要: 为适应日益增多的低速风洞全模颤振试验的需要,发展颤振试验技术,在气动中心低速所3.2m 风洞建立了一套通用的悬挂支撑系统。该悬挂系统分为垂直和水平两部分,水平悬挂系统由水平钢索装置和张紧机构组成。系统可提供模型沉浮、俯仰、横侧向、偏航和滚转5个方向的自由度;可单独改变模型某一方向的自由度而不影响其它方向的自由度;可确保模型上下、左右、前后位置都处于试验段正中心;可方便地调整模型的迎角和滚转角。对采用该悬挂系统的颤振模型,文中提供了技术要求和参数选择方法。采用同一颤振模型在3.2m 风洞与TsAGI 的 T-103风洞进行了对比试验,得到的颤振临界速度、频率基本一致,证明该套悬挂系统设计合理,可以应用于低速全模颤振试验。Abstract: To meet the increasing requirement for full model flutter tests in low speed wind tunnel,a sort of floating suspension system(FSS)is built in WT 3.2m of LSAI of CARDC. The FSS is divided into two parts:vertical part and horizontal part.The horizontal part of FSS consists of horizontal cable device and tensioning mechanism.For general function,the FSS can provide a model 5 degrees of freedom:in the vertical and lateral directions,pitch,yaw and roll. Each degree of freedom of the model can be changed individually with other degrees of freedom unaffected.The FSS can ensure a model supported in the middle of the test section in the verti-cal,lateral and fore-and-aft directions.It is convenient to adjust the attack angle and roll angle of a model in FSS.For a flutter model in FSS,technical requirement and method of choosing pa-rameters are presented in this paper.The same flutter model has been used in contrast tests in WT 3.2m of LSAI of CARDC and WT T-103 of TsAGI.The critical flutter speed and frequency of the model in the contrast tests are almost the same.It is testified that the FSS is reasonably designed and can be well put in use in low speed full model flutter tests.
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