Abstract
The SCRAM jet engine is characterized by supersonic combustion. In supersonic combustion, one of the most important issues is supersonic mixing. The main purpose of the present study is to find mixing enhancement methods in supersonic mixing. One method utilizing the flexible sheet flutter for supersonic mixing enhancement is proposed and investigated. As a flexible sheet, rubber thin sheets were examined with several elasticity moduli and flow direction lengths. Water was injected just upstream of a flexible sheet to in the supersonic flow. The flow and mixing fields were visualized by schlieren method and a high-speed camera. The frequency and modes of flutter and the mixing were calculated based on captured images. The results show that the flutter frequency decreases as sheet length increases. The flutter frequency decreases slightly with water injection compared to that without the injection. An increase of sheet length enlarges the diffusion region of water.
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