Reconstructing shock front of unstable detonations based on multi-layer perceptron

查看全文 作　　者：Lin [1,2]Zhou;Honghui [1]Teng;Hoi Dick [3]Ng;Pengfei [4,5]Yang;Zonglin [4,5]Jiang

机构地区：[1]School of Aerospace Engineering,Beijing Institute of Technology,Beijing,100081,China;[2]State Key Laboratory of Laser Propulsion and Application,Beijing Power Machinery Institute,Beijing,100074,China;[3]Department of Mechanical,Industrial and Aerospace Engineering,Concordia University,Montreal,QC,H3G 1M8,Canada;[4]State Key Laboratory of High Temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences,Beijing,100190,China;[5]School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Acta Mechanica Sinica》索引2021年第37卷第11期,共15页

基　　金：This work was supported by the National Natural Science Foundation of China(Grant 11822202). 摘　　要：The dynamics of frontal and transverse shocks in gaseous detonation waves is a complex phenomenon bringing many difficulties to both numerical and experimental research.Advanced laser-optical visualization of detonation structure may provide certain information of its reactive front,but the corresponding lead shock needs to be reconstructed building the complete flow field.Using the multi-layer perceptron(MLP)approach,we propose a shock front reconstruction method which can predict evolution of the lead shock wavefront from the state of the reactive front.The method is verified through the numerical results of one-and two-dimensional unstable detonations based on the reactive Euler equations with a one-step irreversible chemical reaction model.Results show that the accuracy of the proposed method depends on the activation energy of the reactive mixture,which influences prominently the cellular detonation instability and hence,the distortion of the lead shock surface.To select the input variables for training and evaluate their influence on the effectiveness of the proposed method,five groups,one with six variables,and the other with four variables,are tested and analyzed in the MLP model.The trained MLP is tested in the cases with different activation energies,demonstrates the inspiring generalization capability.This paper offers a universal framework for predicting detonation frontal evolution and provides a novel way to interpret numerical and experimental results of detonation waves. 关键词：Cellular detonation Lead shock evolution Multi-layer perceptron Numerical simulations

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Reconstructing shock front of unstable detonations based on multi-layer perceptron

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