DEVELOPMENTAL SCIENTIFIC RESEARCH ON CERAMIC CONTROLLABLE-STRUT FOR SUPERSONIC COMBUSTION

提出了一种新设计的冲压或超燃冲压发动机支板，并在实验台上进行了马赫数为1.5的超声速气流中的燃烧实验。该支杆模型由两部分组成，沿气流方向划分，并且支杆的一部分可以改变，例如，响应于气流条件。因此，希望在任何燃料和空气条件下都能实现火焰稳定。该可控支柱的两个部分之间的间隔可以改变到60 mm，并且后支柱的移动速度也可以变化。结果表明，在一定的流速范围内，火焰稳定性得到了改善，但由于流动的不稳定性，火焰稳定性取决于运动速度。支撑杆是陶瓷材料，可加工性非常好，经过多次十秒的实验，都没有任何问题。

A newly devised strut made on an experimental bais was proposed for the ramjet or scramjet engine and its combustion experiments were carried out in supersonic airflow of Mach number 1.5. This strut model is composed of two parts divided streamwise and a part of the strut can be changed, for example, in response to airflow condition. Therefore, it is expected that the flame-holdindg is always possible in any condition of fuel and air. The intervening space between two parts of this controllable strut can be changed up to 60 mm and also the moving speed of the rear strut can be variable. It was found that the flame-holding characteristics were improved, but that they depended on the moving speed beacause of its unstesdiness of the flow. The strut was made of ceramics, whose machinability was so good, and had no problem even after many times of ten-second experiment.