Abstract: In order to improve the methane-air mixture combustion rate, the experiment of a divided constant volume combustion bomb is carried out for fast burning of methane-air mixture by jet ignition. The effects of baffle plate parameters, such as location, orifice diameter and orifice number, on fast burning of methane-air mixture by jet ignition under various initial conditions are studied by means of schlieren method. The experimental data of constant volume combustion bombs with and without single and plural orificed baffle plates are compared. The results show that the combustion rate is improved by an orificed baffle plate. The location C in the constant volume combustion bomb is the best place since the main combustion chamber is easy to burn under certain experimental conditions. The peak combustion pressure of the methane- air mixture increases first and then decreases with the increase in the diameter and number of orifices.

Key words: engineering thermophysics, constant volume combustion bomb, methane-air mixture, transverse daptor parameter, jet ignition