Acoustic Measurements of Multiple Pulse Detonation Engines Firing Out of Phase
Acoustic Measurements of Multiple Pulse Detonation Engines Firing Out of Phase
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DOI：
10.2514/6.2007-445
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发表时间：
2007-01
期刊：
影响因子：
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通讯作者：
N. Caldwell;A. Glaser;E. Gutmark
中科院分区：
文献类型：
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作者：
N. Caldwell;A. Glaser;E. Gutmark
研究了由两台脉冲爆震发动机组成的系统的远场声学特性，以确定几何参数和定时参数的影响。首先对单管和双管系统进行了比较，以隔离增加第二管的效果。然后，通过改变爆轰管之间的发射时间延迟来确定是否有任何超前激波相互作用影响远场噪声。研究发现，完全异相发射的管子可以产生最大的总声压级。进一步研究了爆轰管之间的串扰，发现虽然每个爆轰管都经历了来自相邻管的前导激波的减弱形式，但由于管与管的相互作用，对爆轰周期没有明显的影响。最后一项研究量化了爆轰管间距的影响。
The far-field acoustics of a system comprised of two pulse detonation engines are investigated to determine the effects of geometric and timing parameters. Initially a comparison is made between a single detonation tube and the dual-tube system to isolate the effects of adding the second tube. Then a study is conducted in which the firing time delay between the detonation tubes is varied to determine if any leading shock interactions affect the far-field noise. It is found that tubes fired perfectly out of phase result in the greatest overall sound pressure levels. Further investigation is made into the cross-talk between the detonation tubes, and it is found that although each detonation tube experiences a weakened form of the leading shock from the adjacent tube, there is no significant effect on the detonation cycles due to tube interactions. A final study quantifies the effects of the separation distances of the detonation tubes.