通过综述可知，超声速混合层燃烧研究仍需开展大量工作。
The review suggests that a large amount of research work on combustion in supersonic mixing layers still needs to be conducted.
超声速风洞的起动过程涉及到湍流、激波及低亚声速和高超声速混合流动，是一个非常复杂的瞬态过程。
The starting process of wind tunnel, involving turbulence, shock wave, low subsonic and high supersonic mixing flows, is a very complex transient process.
高超声速气流在燃烧室的停留时间非常短，使得超燃冲压发动机燃烧室内燃料与气流的混合及其燃烧变得非常困难。
Due to extremely short residence time of supersonic airflow, it is difficult to effectively mix and combust for the fuel and air in scramjet combustor.
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