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迷宫通道内部流动和泄漏特性的数值分析 总被引:4,自引:1,他引:3
求解非定常N-S方程, 数值预测了深宽比H/W分别为0.1、0.3和0.5的单空腔直齿迷宫通道的内部流动, 计算结果展示了流动结构的振荡及出口泄漏量下降和回升的波动。3种结构的密封效果优劣与泄漏量波动幅度大小相对应, 其排列顺序是深宽比H/W分别为0.3、0.5和0.1的结构。还讨论了涡运动与涡合并、分离泡的迁移、射流的弯曲及对空腔壁面的冲击等复杂物理过程的内在联系, 分析了射流冲击所产生的多种效应对增加能耗减小泄漏的作用。 相似文献
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流动显示演示了轴对称钝体前缘分离剪切层中Kelvin-Helmholtz不稳定波的演化发展情况。声激励状态下的流场结构与自然状态相比发生了很大的变化,分离剪切层与外加声激励的相互艇蕴含着魔鬼台阶段象,该现象经常在两个振子相互耦合的动力系统中产生。 相似文献
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To satisfy the demand of measuring the velocity of ground moving target through unmanned aerial vehicle(UAV)electro-optical platform,two velocity measurement methods are proposed.Firstly,a velocity measurement method based on target localization is derived,using the position difference between two points with the advantages of easy deployment and realization.Then a mathematical model for measuring target velocity is built and described by 15 variables,i.e.UAV velocity,UAV attitude angular rate,camera direction angular rate and so on.Moreover,the causes of velocity measurement error are analyzed and a formula is derived for calculating the measurement error.Finally,the simulation results show that angular rate error has a strong influence on the velocity measurement accuracy,especially the UAV pitch angular rate error,roll angular rate error and the camera angular altitude rate error,thus indicating the direction for improving velocity measurement precision. 相似文献