發(fā)布時(shí)間：2018-05-10 18:45

  本文選題：集成單元 + 邊界元法�。� 參考：《力學(xué)學(xué)報(bào)》2016年04期

【摘要】：隨著高超聲速飛行器的快速發(fā)展,飛行器及發(fā)動(dòng)機(jī)所面臨的熱防護(hù)壓力越來越大.傳統(tǒng)的被動(dòng)熱防護(hù)系統(tǒng)已很難滿足設(shè)計(jì)要求,因此主動(dòng)冷卻熱防護(hù)系統(tǒng)受到了越來越多的關(guān)注.主動(dòng)冷卻熱防護(hù)系統(tǒng)因?yàn)楣艿烂懿�、結(jié)構(gòu)復(fù)雜,傳統(tǒng)的分析方法需要花費(fèi)大量的精力和時(shí)間來建模和計(jì)算分析.針對(duì)管道陣列排布的主動(dòng)冷卻系統(tǒng),提出了一種用邊界元法求解空間周期性結(jié)構(gòu)的集成單元法,并將其用來分析具有冷卻通道的熱防護(hù)系統(tǒng)的傳熱與受力變形問題.此方法求解空間周期性結(jié)構(gòu)問題,僅需要針對(duì)一個(gè)胞元建立邊界元胞元方程,并由其形成由指定胞元數(shù)組成的集成單元,然后由集成單元組集成總體系統(tǒng)方程組.提出的集成單元法既有常規(guī)子結(jié)構(gòu)法的消元思想,又有傳統(tǒng)有限單元、邊界單元易于組集的特征,便于大型空間周期性結(jié)構(gòu)的快速分析.由于集成單元的系數(shù)矩陣只需形成一次,且最終方程只含邊界節(jié)點(diǎn)未知量,計(jì)算效率顯著提高.論文最后用功能梯度平板和主動(dòng)冷卻燃燒室算例驗(yàn)證了本文所述算法的正確性和計(jì)算效率.
[Abstract]:With the rapid development of hypersonic vehicle, the thermal protection pressure of aircraft and engine is increasing. Traditional passive thermal protection system has been difficult to meet the design requirements, so active cooling thermal protection system has received more and more attention. Active cooling thermal protection system needs a lot of effort and time to model and analyze because of the complex structure of pipeline and the traditional analysis method. For the active cooling system with pipeline array, an integrated element method is proposed to solve the problem of heat transfer and deformation of thermal protection system with cooling channel by using the boundary element method (BEM) to solve the problem of space periodic structure. In order to solve the spatial periodic structure problem, the boundary cell equation should be established for only one cell, and an integrated unit consisting of a specified number of cells should be formed, and then the system equations of the whole system should be integrated by the integrated unit group. The integrated element method not only has the element elimination idea of the conventional substructure method, but also has the traditional finite element method. The boundary element is easy to set up and can be used for fast analysis of large spatial periodic structures. Because the coefficient matrix of the integrated unit only needs to be formed once, and the final equation only contains the unknown quantity of the boundary node, the computational efficiency is improved significantly. Finally, the correctness and efficiency of the proposed algorithm are verified by using functional gradient plate and active cooling combustor.
【作者單位】： 大連理工大學(xué)航空航天學(xué)院工業(yè)裝備結(jié)構(gòu)分析國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(11172055)
【分類號(hào)】：V244.1

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