冰致气流振荡对蒙皮的稳定性影响分析

在结冰试验过程中,由于积冰不断生成,翼型周围流场也会变化,从而对翼面形成不稳定影响。针对混合缩比翼型,采用不同材质蒙皮进行了试验,绘制冰型、考察结冰历程中蒙皮稳定特性,并确定模型的安全情况。结果表明,积冰增长对流场的扰动使得翼面产生不规则冰型。振荡流场作用于蒙皮产生不同的振动效果,碳纤维蒙皮在共振作用下,对振荡反应更迅速,上下表面振动频率在120 Hz和130 Hz左右;铝合金蒙皮则处于逐渐振动的过程,且上下表面相同且振动频率基本稳定在120 Hz左右。

Impact Aanlysis of Ice-induced Airflow Vibrationon Hybrid Airfoil Skin Stability

For large-seale model icing tests , test safety is very important. However,due to the contin-uous generation of ice accretion ,the flow field around the airfoil will change rapidly , which will formunstable effeet on the airfoil. For a hybrid airfoil ,experiments are carried out with different skins,icetypes are drawn respectively and stability characteristics of the skin during the icing process are stud.ied and are drawn the safety of the model is determined. It is shown that the disturbance of the flowfield caused by the accumulation of ice accretion makes the airfoil obtain an irregular ice shape;theskin with different elastic modulus has different response to the oscilating flow field, the vibrationfrequencyof upper and lower surfaceofcarbonfiberskinis arund 120 Hz and 130 Hz, respectivelywhile for Aluminum alloy skin ,which is about 120 Hz.