Abstract
The shadowgraph method, relatively close to Schlieren's method, its an optical method based on the non-uniformities from transparent environments. One makes a study of the burning process for a CH4 fuel mixture - synthetic air, of 11.56% concentration, in a static chamber. The mixture is classically ignited with a spark plug and a laser pulse. The experimental installation is also composed of an optical transmitter type “Quanta Ray DCR Nd-YAG” that is pulsed with a repetition frequency of 20 Hz, a rapid filming video camera and a pressure variation measuring and recording system inside the chamber. The fuel mixture is placed in a tank with an adjustable pressure regulator at 150 atm of pressure. Different parameters of the burning process, like the ones we will present, were determined during the experiments: the maximum achieved pressure, the pressure variation in the burning chamber depending on time, the propagation speed of the flame front, all determined for different values of the initial pressure as for different values of the laser pulse energy. In the end of the paper one made an analysis considering the advantages of laser ignition for the fuel mixture instead of the classic one.
Keywords: Static Chamber, Laser, Photographs, Shadowgraph, Explosion