Operational Sensitivities of an Integrated Scramjet Ignition/Fuel-Injection System
Operational Sensitivities of an Integrated Scramjet Ignition/Fuel-Injection System
复制标题
集成超燃冲压发动机点火/燃油喷射系统的操作灵敏度
DOI：
10.2514/2.6116
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Schetz
中科院分区：
文献类型：
--
作者：
S. Gallimore;L. Jacobsen;W. O'Brien;J. Schetz
给出了在超音速风洞中对集成燃料喷射/点火系统进行的实验的结果，该系统由空气放大器喷射器和等离子炬点火器组成。这项工作的主要目标是确定空气灯的升力效应如何影响等离子射流，确定通过空气灯的燃料喷射和提供给火炬的电力如何影响设备下游激发态物质的分布，并研究组合产生的任何协同效应。据观察，空气坡道对等离子射流具有很强的提升作用，特别是对于喷射器动量-出口比高于 1.5 的情况。此外，炬管输入功率的增加对等离子体射流下游激发态物质的发射强度产生指数效应，但没有观察到对射流穿透高度的影响。结果表明，燃烧增强自由基的渗透增加在很大程度上是喷射器产生的流体机制的函数，因此有助于等离子炬将燃烧动力学影响到比通常可能的更远的自由流中。
Results are presented of experiments conducted in a supersonic wind tunnel on an integrated fuelinjection/ignition system, consisting of an aeroramp injector and a plasma-torch igniter. The main goals of the work were to determine how the lifting effect of the aeroramp affected the plasma jet, to ascertain how the injection of fuel through the aeroramp and the power supplied to the torch ine uenced the distributions of excited species downstream of the device, and to investigate any synergistic effects from the combination. The aeroramp was observed to have a strong lifting effect on the plasma jet, especially for injector momentum-e ux ratios above 1.5. In addition, increases in the torch input power produced an exponential effect on the emission intensity of the excited-state species downstream of the plasma jet, but was not observed to ine uence the jet penetration height. The results demonstrate that the increased penetration of combustion enhancing radicals is largely a function of the e uidic mechanisms generated by the injector and, thus, aids the plasma torch in ine uencing the combustion kinetics farther into the freestream than would normally be possible.