ИСТИНА

Experiments on the visualization of the flame propagation in a lean hydrogen-air mixture were conducted. The flame was visualized using an infrared camera and a high-speed camera with a shadow device IAB-451. The main spectral mode of water steam emission is 2.7 µm and the location of combustion products is registered by the infrared camera. Shadow visualization of a flame is based on the deviation of a plane parallel beam of visible light on variations in the refractive index of the medium. It reveals the heat front ahead the flame. We suppose that the reaction zone is located between the heat front which is revealed by the shadow technique and the front of combustion products detected by the infrared camera. In this work we report the results of the investigation of the flame front and its wrinkled structure. The reported study was funded by RFBR according to the research project No. 20-31-70041.