Ignition Systems for Gasoline Engines by Michael Günther & Marc Sens

Author:Michael Günther & Marc Sens
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

The current paper describes experiments performed in a custom-built, optically accessible spark calorimeter used to evaluate high-voltage PND. For all experiments, the test gas was ultra-air with a point-to-point electrode configuration selected so that the local E/N, and hence active radical formation, was maximized near the anode and cathode. Pressure-rise calorimetry was used to measure the electrical-to-thermal energy conversion efficiency for single PND discharges as a function of ambient pressure and electrode gap distance. Calorimetry results were further used to determine the SSB probability for each pressure and gap distance; the electric-to-thermal efficiency was conditionally averaged based on whether the PND remained an LTP or transitioned to a SSB discharge. The SSB probability as a function of initial pressure was further determined for a 10-pulse burst with a fixed 5.0 mm electrode gap distance. Post-discharge in situ O-atom populations were also directly measured via two-photon absorption laser induced fluorescence (TALIF) [35, 36] for select LTP-only conditions. Finally, the calorimetry results are used to evaluate potential thermal and chemical mechanisms believed to be responsible for SSB.

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