On the Nature of the Acoustic Oscillations in Gas Explosions

Abstract

Abstract The possible existence of acoustic oscillations (oscillating combustion) in gas explosions in unclosed volumes is known. A significant increase in risks was confirmed, if it happens indoors, which makes studies in this direction relevant. But the solution to this problem has proven difficult for two reasons. First, the results of the experimental studies turned out to be reproducible with weak reliability. This circumstance takes place, despite the fact that the first classical experiments, resulting in acoustic oscillations during gas heating, date back to the 19th century. The second reason why research is difficult is that by now there are no reliable mathematical models describing the process of excitation and development of oscillating combustion in gas explosions. The gas explosion simulation using the example of cylindrical chamber with a diameter of 200 mm and a length of 1.5 meters and a window on the lateral surface. The chamber in the initial state is filled with propane-air mixture, which is ignited at the left end along the chamber axis. The validity of mathematical model was checked by comparing the results of the gas explosion development calculation in the tube with other known results obtained in the closed circular tubes.