Flow Modulation at Micro-combustor Inlet

Recirculation zones formed in micro-combustors due to flow modulating geometries such as backward facing step and block inserts have been found to enhance the outer wall temperatures. Numerical investigations of micro-combustors with variable aspect ratio (AR) and blockage ratio (BR) triangular block inserts have been made for premixed H2-air combustion with inlet velocities ranging from 4 to 48 m/s using commercial CFD software ANSYS Fluent software. AR = 3 was found effective at lower velocities, while AR = 1 performed better at higher velocities for all blockage ratios.