高压放电冲击波的变能量释放问题

以高压放电冲击波实验为基础,运用特征线法进行数值模拟,研究了变能量冲击波问题,得出了与实验结果符合较好的结果,对变能量冲击波的能量补充机理有了新的认识。

高重复频率准分子激光器中放电冲击波特性的实验研究

采用阴影法对高重复频率准分子激光器放电腔内的放电冲击波现象进行了实验研究,研究结果揭示了放电冲击波的产生以及演化过程。通过对观测结果进行分析,获得了放电冲击波的3种典型形式:横向冲击波、纵向冲击波(主电极冲击波)和预电离冲击波。估算了3种冲击波的波速,进而分析了可会受冲击波影响的重复频率。研究成果可以为高重复频率准分子放电腔的设计提供支持,尤其是可以在放电冲击波抑制结构的设计方面提供支持。

准分子激光器中放电冲击波的仿真研究

分析了准分子激光器放电腔内放电冲击波能量来源的计算方法,利用Fluent软件对放电冲击波物理过程进行了二维仿真,揭示了300μs内横向冲击波和纵向冲击波的演化过程,获得了此过程中气体速度、密度、压力和温度等关键参数的变化规律。对仿真结果进行分析,得出了高重复频率放电腔设计中应注意的关键位置以及处理方法,提出了选取放电腔尺寸和边界等参数时的参考依据。

冲击波增透煤层装备在煤矿中的应用

针对我国煤矿低透气性煤层抽采瓦斯困难、浓度低,提出了一种基于冲击波技术的煤层增透技术装备的设计思路;通过实际测试试验,煤层增透效果明显,瓦斯浓度由10%提高到了13.98%,提高了约40%;增透作业后,增透效果保持时间较长,能够满足矿井抽采瓦斯的需要。冲击波增透技术装备满足煤矿井下使用的技术要求,设备尺寸小、质量轻、移动操作方便。

Discharge of a Shock Wave from an Open End of a Tube

When a Pressure wave propagates along a constant area straight tube and reaches at the open end, an impulsive wave is emitted outward from the tube exit toward the surrounding area and causes an impulsive noise like a sonic boom. In order to clarify the magnitude of an impulsive wave obtained by the discharge of a weak shock wave born an open end of a tube in relation to the noise problem and the industrial devices, the experimental and numerical investigations have been carried out for various strength of a shock wave. A simple open end shock tube with the flange at the tube exit.was used and the numerical calculation using the TVD scheme was performed. The effective equations which concerns with the magnitude of an impulsive wave generated by the emission of a shock wave have been obtained from the procedure of the open end correction based on the aeroacoustic theory and the numerical results. The influence of open end correction length and the diameter of a flange on the magnitude of an impulsive wave has been discussed.