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通过实验和数值方法,对脉冲爆震发动机(Pulse Detonation Engine,PDE)外流场进行了可视化研究。实验中采用YA-16高速阴影系统,拍摄了爆震外流场的时序阴影照片。对高温火团引发的氢气-氧气-氮气爆震过程和管内、外流场分布进行轴对称数值模拟,其中考虑了包含19个基元反应和9种组份的H2-O2-N2详细化学反应动力学机理。根据计算结果,由计算光学获得爆震外流场的时序计算阴影图。数值计算结果和实验结果基本一致,均形象地描述了管外流场的变化。根据实验和数值计算结果,详细地讨论了涡环和悬吊激波产生的动力学机理及其发展变化过程。
The external flow field of Pulse Detonation Engine (PDE) was visualized through experiments and numerical methods. YA-16 high-speed shading system was used in the experiment to photograph the timing shadow photo of the knockout flow field. Axisymmetric numerical simulation of the hydrogen-oxygen-nitrogen detonation process and the distribution of the internal and external flow fields caused by the high-temperature fire group was carried out. The detailed chemical reaction of H2-O2-N2 containing 19 elementary reactions and 9 components was considered Kinetic mechanism. According to the calculation results, the shading diagram is calculated by calculating the optical timing of the knocking outflow field. The results of numerical calculation and experimental results are basically the same, which all vividly describe the change of the flow field outside the tube. Based on the experimental and numerical results, the dynamic mechanism of vortex ring and suspension shock wave and its development and change process are discussed in detail.