STUDY OF THE INFLUENCE OF A PARAXIAL POROUS INSERT ON COMBUSTION OF A SWIRLING FLOW OF A MIXTURE OF METHANE AND AIR

A study has been carried out on the influence of a paraxial porous insert on physical processes arising during the combustion of a swirling flow of a mixture of methane and air. With decrease of the porosity the role of conductive heat exchange in the porous layer grows. As a result, heat release in the peripheral combustion zone is transferred to the porous insert, causing ignition of the gas in the axial part of the channel. The combustion zone approaches the entrance to the channel, whereupon the flame front becomes less curved. The high thermal conductivity of the frame of the setup ensures stable combustion in the immediate vicinity of the entrance to the channel.