The mechanism of self-ignition and flame holding in supersonic combustion chamber

The presented research has been concentrated to definition of conditions of self-ignition of hydrogen in the combustion chamber at the entrance Mach number 4. The experimental model was made in the form of rectangular channel with a flame holder in the form of backward facing step (BFS). Fuel injection was carried out in front of BFS on the top and bottom walls of model through 8 circular holes, which was located under angles of 45° or 90°. Performed investigations allowed determining effective model of fuel injection for self-ignition and flame stabilization and prevention of choking of the channel. It is shown that the choice of the fuel injection scheme determines the ignition conditions and controlling the combustion process.