另外，鉴于弯曲管道与直管道内激波串长度之间的明显差异，已有的基于直管道的激波串长度经验公式不能很好地适用于弯曲管道。
The existing empirical correlation based on straight duct can not predict well the length of shock train in bend duct due to their distinct difference in shock train length.
发现了在接近喷嘴出口的区域里，出现了与射流内的激波、膨胀波有关的振荡流。
At the region near the nozzle exit, a vibrating flow phenomenon is found, which is associated with the expansion waves and shock waves reflections inside the gas jet.
本文研究了激波与堆积粉尘相互作用后，气体和堆积粉尘内产生的复杂波系，主要从实验和理论两个方面对此进行了研究。
This paper is intended to study the complex wave structure generated in gas and starch dust bulk while interaction of shock wave with starch dust bulk through experiment and theory analysis.
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