间断伽辽金方法在燃机空气系统中的应用  

Discontinuous Galerkin Method and Application for Gas Turbine's Secondary Air System

作　　者：谭勤学[1] 林立[2] 吴康[1] 任静[1] 蒋洪德[1] 

机构地区：[1]清华大学热能工程系,北京100084 [2]福州大学石油化工学院,福州350116

出　　处：《工程热物理学报》2015年第6期1201-1206,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51376099)

摘　　要：间断伽辽金方法(DGM)对守恒变量及梯度变量具有一致的任意高阶计算精度,因此该方法也具有较高的热流计算精度。本文搭建了二次空气系统单元机理实验台,并采用DGM对中心进气转静系开展了数值计算,取得了误差小于10%的对流换热系数计算结果。此外本文结合SST-γ-Re_θ转捩模型,应用有限体积方法(FVM)及DGM,对燃气轮机旋转盘腔内流动与传热进行了预测,并取得了与实验结果吻合较好的传热预测结果。此两转转系及转静系典型问题验证了DGM对燃气轮机二次空气冷却流动传热预测具有一定优势,展现了DGM在燃气轮机二次空气系统中广阔的应用前景。As Discontinuous Galerkin Method(DGM) can fulfill arbitrary high-order accuracy consistently for conservation variables and gradient variables,high-order accuracy of heat flux is also expected.The test rig which focused on the mechanism studies of the secondary air system typical cavities was built in this paper.DGM was used for the calculation of one case about this test rigs,and less than 10%numerical errors were achieved.Furthermore,the SST-γ-Re_θ transition model combined with FVM and DGM were applied to the unsteady calculation of buoyancy induced flow in rotating cavity.By comparing with the traditional FVM and experimental data,the performance of DGM was much better in terms of heat transfer.These two cases both showed that the DGM could be suitable for the simulation of flow and heat transfer of secondary air system in gas turbine,and having a bright future,especially for the prediction of the heat flux.

关 键 词：间断伽辽金方法(DGM) 二次空气系统 中心进气转静腔室 轴向通流转转腔室 

分 类 号：TK472[动力工程及工程热物理—动力机械及工程]