Experimental Study of Ejectors Driven by a Pulse Detonation Engine
Experimental Study of Ejectors Driven by a Pulse Detonation Engine
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DOI：
10.2514/6.2007-447
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发表时间：
2007-01
期刊：
影响因子：
2.2
通讯作者：
A. Glaser;N. Caldwell;E. Gutmark;J. Hoke;R. Bradley;F. Schauer
中科院分区：
文献类型：
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作者：
A. Glaser;N. Caldwell;E. Gutmark;J. Hoke;R. Bradley;F. Schauer
为了更好地了解脉冲爆震发动机（PDE）驱动的引射加力器的工作情况，进行了实验研究。本研究采用了H2空气PDE在30 Hz的工作频率。沿喷射器的内表面（包括进气和排气部分）沿着测量静压。引射器提供的推力增加是通过沿引射器几何形状沿着测量的静压积分来计算的。计算出的推力增量与直接测量的推力增量吻合得很好。直和发散喷射器进行了研究。从发散引射器压力分布可以看出，发散段的作用是作为亚音速扩压器。还研究了喷射器的轴向位置。引射器压力数据遵循与直接推力测量相同的趋势。发现最佳轴向布置在PDE下游，接近x/DPDE=+2，而上游布置则趋向于减小推力增大。为了更好地解释所观察到的性能趋势，得到了爆震波和尾涡与引射器入口相互作用的阴影图像。
Experimental studies were performed in order to better understand the operation of ejector augmenters driven by a pulse detonation engine (PDE). This research employed a H2air PDE at 30 Hz operating frequency. Static pressure was measured along the interior surface of the ejector including the inlet and exhaust sections. Thrust augmentation provided by the ejector was calculated by integration of the static pressure measured along the ejector geometry. The calculated thrust augmentation was in good agreement with the augmentation found from direct thrust measurements. Both straight and diverging ejectors were investigated. It can be seen from the diverging ejector pressure distribution that the role of the diverging section is to act as a subsonic diffuser. Ejector axial position was also studied. The ejector pressure data follows the same trend as that of the direct thrust measurements. The optimum axial placement was found to be downstream of the PDE near x/DPDE=+2, while upstream placements tended towards a decreasing thrust augmentation. In order to better explain the observed performance trends, shadowgraph images of the detonation wave and trailing vortex interacting with the ejector inlet were obtained.