燃烧室流动混合过程的代理模型  

Surrogate model of combustor flow mixing process

作　　者：耿俊杰 王兴建 李嘉璐 费腾 祁海鹰[1] GENG Junjie;WANG Xingjian;LI Jialu;FEI Teng;QI Haiying(Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]清华大学能源与动力工程系,北京100084 [2]山东科技大学土木工程与建筑学院,青岛266590

出　　处：《清华大学学报（自然科学版）》2023年第4期633-641,共9页Journal of Tsinghua University(Science and Technology)

基　　金：国家科技重大专项(Y2019-I-0022-0021)。

摘　　要：为了构建适用于燃烧室冷态流动混合过程的代理模型(surrogate model,SM)的方法,该文研究了构建过程中的关键步骤,通过使用Latin超立方抽样(Latin hypercube sampling,LHS)方法进行样本选取,在完成数值模拟后使用本征正交分解提取样本间的主要特征进行降维,再通过Kriging插值法完成工况插值。结果表明:该构建方法能够处理冷态高速、高湍流度、强旋流动和燃料/空气掺混,精度高于国际平均水平。同时,该文提出了构建方法的应用准则,为后续更复杂、包含燃烧反应过程以及结构变化的燃烧室SM构建奠定基础。[Objective]Numerical simulation of a gas turbine combustor is an important step in its design process.Due to the complexity of the physical and chemical processes,the calculation cost is high.The calculation cost can be reduced by constructing surrogate model of combustor.This paper focuses on the key steps in the construction of a surrogate model suitable for cold gas flow and the mixing process of combustor.Furthermore,this paper proposes a surrogate model for the central nozzle and the subsequent combustor space of a heavy-duty gas turbine.[Methods]The construction of the surrogate model includes several key steps:design of experiments(DOE),numerical simulation,dimensionality reduction,and an interpolation process.Two parameters are selected as the input parameters for the surrogate model:The fuel mass flow rate Gf and the combustor inlet air pressure p2.Latin hypercube sampling is used in the DOE to determine 12 operating conditions for computational fluid dynamics(CFD)simulations,and the results are used to build the surrogate model.Proper orthogonal decomposition is used for dimensionality reduction,wherein a set of basis functions and corresponding coefficients are extracted.The basis functions reflects the main characteristics of the combustor flow field.Moreover,the data dimensionality is reduced from the number of grid nodes of the combustor to the number of basis functions,which do not exceed the number of operating conditions.The Kriging model is used to interpolate the coefficients of the basis function with the input parameters of the surrogate model.Four verification conditions are set up to determine the accuracy of the surrogate model through a comparison of the surrogate model results with the CFD simulation results.The outlet cross section of the central nozzle and the longitudinal section of the combustor are selected to compare multiple key parameter distributions,including axial velocity,radial velocity,tangential velocity,CH4 concentration,turbulent kinetic energy,and pressure.The vector op

关 键 词：燃烧室代理模型 Latin超立方抽样 本征正交分解 KRIGING插值 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]