To investigate the characteristics of 3-D viscous flow outside multi-tube Pulse Detonation Engine (PDE), the 3-D viscous space-time Conservation Element and Solution Element(CE/SE) method was deduced to simulate the flow-flied inside and outside Pulse Detonation Engine with seven tubes. In the multi-tube model, one tube is in the midst and the other six tubes are around it with a circle. One-dimensional model was used for the flow inside PDE, and three -dimensional model was adopted for the flow outside PDE to obtain the varieties of the flow outside the multi-tube PDE. The results indicate that there are vortexes, shocks and expansion waves outside the multi-tube PDE. In addition, the results might be referrible to research the characteristics of the flow-field outside multi-tube Pulse Detonation Engine.%为研究多管脉冲爆轰发动机黏性外流场变化特点,推导了三维黏性CE/SE方法,并对7管脉冲爆轰发动机的内、外流场进行了数值计算. 7个爆轰管的排列方式是1个居中、另外6个绕其形成环状排列.管内流场采用一维模型进行处理;管外流场采用三维模型进行计算,得到多管脉冲爆轰发动机黏性外流场的变化规律.计算结果表明,此多管脉冲爆轰发动机黏性外流场中存在旋涡及多道相互作用的激波与膨胀波,该结果对多管脉冲爆轰发动机外流场特性研究具有一定的参考价值.
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