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1 Transactions of the Institute of Fluid-Flow Machinery

1 2007

1 Kanazawa S.

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Laser diagnostics of NO molecules and OH radicals in DC positive streamer corona discharges

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Kanazawa S.

Transactions of the Institute of Fluid-Flow Machinery

2007

tom nr 119

39-54

The streamer observation and LIF detection of the NO molecules and OH radicals were performed during the steady-state positive DC corona discharge at atmospheric pressure. The time relationship between the regular streamer coronas, laser pulse, LIF signal and laser-induced streamer was explained for no time synchronization LIF measurement. Using the corona radical shower reactor, two-dimensional distributions of ground-state NO (X_2II) could be observed not only in the discharge zone but also both in the downstream and the upstream regions of the reactor. The presence of the ground-state OH (X_2II) and excited-state OH (A_2...) radicals in DC streamer discharge was also investigated. Moreover, the effect of electrohydrodynamic (EHD) flow on NO profiles in the reactor and ozone interference in OH LIF measurement were discussed. The obtained results sllOwed that the density of NO molecules decreased not only in the plasma region formed by the corona streamers and the downstream region of the reactor but also in the upstream region of the reactor. On the other hand, the ground-state OH radicals were generated and stayed mainly in the region where streamers propagated betweell the electrodes.