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对充满氢氧可燃气体、带扩容腔的正向爆轰驱动的激波风洞进行了数值模拟。计算采用了欧拉方程,频散可控耗散差分格式(DCD)和改进的二阶段化学反应模型。在扩容腔附近采用二维轴对称计算模型,而在驱动段和被驱动段的直管道部分则采用一维计算模型。本文分析了爆轰波在管道中的传播、反射和绕射过程。计算结果表明扩容腔的尺寸对爆轰波的传播、反射、汇聚等起着决定性的作用;带扩容腔的正向爆轰驱动的激波风洞能够得到平稳的持续时间较长的气流,提高了实验的精确度和可重复性。
A numerical simulation of a shock tunnel driven by a positive detonation filled with oxy-combustible gas and with a cavity is carried out. Euler equations, dispersion-controlled dissipative difference format (DCD) and improved two-stage chemical reaction model are used in the calculation. A two-dimensional axisymmetric calculation model is used near the expansion chamber, and a one-dimensional calculation model is used in the straight pipe section of the driven section and the driven section. This paper analyzes the propagation, reflection and diffraction of detonation waves in a pipeline. The calculation results show that the size of the expansion chamber plays a decisive role in the propagation, reflection and convergence of the detonation wave. The shock tunnel driven by the positive detonation with the expansion chamber can obtain steady and long-lasting airflow and improve Experimental accuracy and repeatability.