飞机防冰腔结构参数的重要性测度

Importance measure of aircraft anti-icing cavity stucture parameters

分析了常见的3种飞机防冰腔结构,应用Gambit软件建立了双蒙皮防冰腔结构网格模型。采用Spalart-Allmaras湍流模型模拟热气在防冰腔内的流动状况,采用Fluent软件进行传热效率分析,建立了防冰腔结构参数对传热效率的重要性测度模型。通过随机响应面法建立防冰腔结构参数与传热效率的函数关系,采用低分散性抽样法求解防冰腔结构参数的重要性测度,建立了防冰腔结构参数的重要性测度分析流程。分析结果表明:当笛形管中心到外蒙皮的距离从35.15mm增加到38.85mm时,传热系数由0.505减小到0.463;当双蒙皮通道高度从2.85mm增加到3.15mm时,传热系数由0.495减小到0.476;当射流孔孔径从1.90mm增加到2.10mm时,传热系数从0.505减小到0.494;当射流孔角度从14.25°增加到15.75°时,传热系数从0.476增加到0.494。防冰腔结构参数的重要性排序依次为射流孔角度、笛形管中心到外蒙皮距离、射流孔孔径、双蒙皮通道高度,在防冰腔结构加工与装配过程中,需要重点考虑射流孔角度与笛形管中心到外蒙皮距离这2个参数。

The three common aircraft anti-icing cavity structures were analyzed, the grid model of anti-icing cavity structure with double skins was set up by using Gambit software. The flowing condition of heat in anti-icing cavity structure was simulated by using Spalart-Allmaras turbulence model, the heat transfer efficiency was analyzed with Fluent software, and the importance measure model of anti-icing cavity structure on heat transfer efficiency was built. The function relationship between structure parameters and heat transfer coefficient for anti-icing cavity was established by using the stochastic response surface method, the low dispersion sampling method was used to solve the importance measure, and the analysis process of importance measure for anti-icing cavity structure parameters was set up. Analysis result shows that when the distance between piccolo tube center and outer skin increases from 35.15 mm to 38.85 mm, the heat transfer coefficient reduces from 0. 505 to 0. 463. When the channel height of double skins increases from 2.85 mm to 3. 15 mm, the heat transfer coefficient reduces from 0. 495 to 0. 476. When the jet hole diameter increases from 1.90 mm to 2.10 mm, the heat transfer coefficient reduces from 0. 505 to 0. 494. When the jet hole angle increases from 14. 25~ to 15.75~, the heat transfer coefficient increases from 0. 476 to 0. 494. The importance order of anti-icing cavity parameters is the jet hole angle, the distance between piccolo tube center and outer skin, the jet hole diameter, the channel height of double skins. In the machining and assembly process of anti- icing cavity structure, the jet hole angle and the distance between piccolo tube center and outer skin are mainly considered. 2 tabs, 12 figs, 27 refs.