Transient response in n-InP PEC cells and effect of surface modification

The transient photovoltaic response of single crystal n-InP electrodes in a PEC cell has been studied at different frequencies using a light chopper. The variables were light intensity, chopping frequency and redox species. The nature of the response and time constants were found to be sensitive to modification of the InP surface using ruthenium ions. The capture cross-section and density of traps at the semiconductor-electrolyte interfaces have thus been determined.     

Simultaneous TR-SPIV and CH* chemiluminescence during precursor to LBO in a lean premixed swirl dump combustor

Blowout process in premixed swirl dump combustors is known to have temporary partial extinction followed by re-ignition events as precursors. This re-ignition process is investigated using high-speed CH* chemiluminescence and simultaneous TR-SPIV. It was found that during the extinction phase, the flame split into two zones, causing fresh mixture to enter the inner recirculation zone. The sudden loss of heat release causes the flow field to change such that the stagnation point moves further downstream, causing high negative velocity paths in the flow. The flame that was convected downstream, now uses these negative velocity paths to consume the fresh mixture that entered the IRZ. This is the re-ignition phase of the precursor event.