Research on Couple Mechanism of Heat Release and Acoustic Characteristics during Combustion of Butane in Close Chamber 2007-01-2175

By introducing the combustion theories and acoustic theories, this paper combines a combustion model and an acoustic model and describes the oscillation in actual close combustion chamber. This is so called couple of heat release and acoustics characteristics, whose mechanism is that the pressure in combustion chamber increases violently during combustion. The changes in pressure field then cause the acoustic response named cavity oscillation. Then the gas in cavity behaves as wave. This kind of fluctuation will influence the combustion itself in reverse. According to the mathematic model, with the assumption of laminar combustion, a two-dimensional procedure is composed to calculate the isometric combustion of butane which is pre-mixed with atmosphere. After the wave equations being taken into account, the results of solution are different from those without wave equations. Contour graphs of pressure are drawn and compared. The coupled phenomena of heat release and acoustic characteristics are analyzed.