A Study on Control of Supersonic Combustion using Mixing Enhancement by Instability Excitation

不稳定激励混合强化控制超音速燃烧的研究

基本信息

批准号：
11450082
负责人：
KONO Michikata
金额：
$ 9.6万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

The objective of the present study is to investigate experimentally mixing enhancement of fuel and air and combustion enhancement in supersonic air flows. The instability of the mixing layer which formed between air flow and fuel flow is excited by injection of the acoustic disturbances. The cavity which is located on the wall of the flow channel is used as the source of acoustic disturbances. The mixing enhancement is expected to be appeared by acoustic disturbances, and consequently the combustion efficiency is expected to increase.Non-Combustion Experiments : Experiments without combustion are conducted at the first stage in order to investigate effects of acoustic disturbance on the growth of the mixing layer. Hydrogen is injected as a gaseous fuel parallel to the supersonic air flow. The acoustic disturbance is injected to the supersonic mixing layer in order to explore mixing enhancement by acoustic disturbances. Measurements of Pilot pressure distribution in the mixing layer is … More conducted and Schlieren photography is used for the visualization of the mixing layer by a CCD camera with the image intensifies The results show that the growth rate of the mixing layer is larger with the acoustic disturbance than that without it. This suggests that the injection of the acoustic disturbance is effective for the enhancement of the mixing of air and fuel.Combustion Experiments : The acoustic disturbance is injected to the mixing layer with combustion and the combustion efficiency is obtained in order to investigate effects of mixing enhancement mentioned above on the combustion behavior. The combustion efficiency is obtained from the measured wall pressure profiles in the combustion chamber. The combustion efficiency with the acoustic disturbance is larger than that without it. The results also show that the intense combustion mode appears stably using acoustic disturbances.These results indicate that, the injection of the acoustic disturbance is useful for the enhancement of mixing and increase in the combustion efficiency in the supersonic flow. Less

本研究的目的是研究超音速空气流中燃料，空气和组合增强的实验混合。在空气流和燃料流之间形成的混合层的不稳定性是通过注射声灾害激发的。位于流道壁上的空腔被用作声学灾难的来源。预计将通过声学灾难提出混合增强，因此预计混合有效性将增加。无燃烧实验：在第一阶段进行没有燃烧的实验，以研究声学灾难对混合层生长的影响。将氢注射为平行于超音速气流的气态燃料。声学灾难被注入超音速混合层，以探索声学灾难的混合增强。混合层中试验压力分布的测量是……进行了更多的执行，Schlieren摄影用于通过图像加剧的CCD摄像机可视化混合层，结果表明，混合层的生长速率在声学灾难中比没有它的灾难层更大。这表明，注射声学灾难对于增强空气和燃料的混合有效。Bustion实验：与混合物一起将声学灾难注入混合层，并获得了燃烧效率，以研究上面提到的增强对组合行为的混合效果。组合效率是从组合室中测得的壁压轮廓获得的。与声学灾难的结合效率大于没有灾难的效率。结果还表明，强烈的组合模式使用声学灾难稳定出现。这些结果表明，注入声学灾难对于增强混合和超音速流中混合效率的提高非常有用。较少的