What is it about?

In this work, we explore the possibility of using a resonant ionization technique to more efficiently generate a dual-pulse plasma. Once developed, we investigate resulting air plasma properties and combustion characteristics, and assert the differences between the resonant dual-pulse plasma formed here and other non-resonant dual-pulse plasmas formed in other works.

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Why is it important?

The majority of existing laser ignition research delves into single source non-resonant ionization. Though a highly robust and applicable method, it is a much more of a brute force technique. Two less explored areas of laser plasma formation are multi-source and resonant ionization. By combining the two, the resonantly formed dual-pulse plasma becomes much more tailorable through input variable adjustments such as time delay, pulse energies, and laser wavelengths.

Perspectives

Resonant multi-pulse plasma formation is exciting because there are a variety of different variables which can be adjusted. Some of these parameters include, but are not limited to, the number of input beams, the beam wavelengths, the time offset between the pre-ionization pulse and the energy addition pulse(s), and the individual pulse energies and corresponding proportion(s) between them. Manipulation of each of these variables may result in entirely different plasma properties and ignition characteristics. Some combinations prove more energy efficient. Others generate extremely high electron densities and temperatures. Some ignite much leaner fuel/air combinations than others, while others still produce much more efficient combustion events. This of course means that a number of set of input conditions could have entirely different applications. As more and more of these variables are adjusted it will become apparent what input parameters are favorable for certain desirable outcomes.

Carter Butte
Colorado State University

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This page is a summary of: Dual-Pulse Laser Ignition Using Oxygen REMPI Preionization, June 2019, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2019-3117.
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