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Multi-point laser-induced ignition of air-methane mixtures by a high peak-power passively Q-switched Nd:YAG/Cr4+:YAG laser by Vasile, Nicolae-Tiberius (author);Pavel, Nicolaie (author) is a Engineering article available to read on EtoBox.

What is Multi-point laser-induced ignition of air-methane mixtures by a high peak-power passively Q-switched Nd:YAG/Cr4+:YAG laser about?

We report on multi-point laser ignition of air-methane mixtures in a static, constant-volume spherical chamber. A fiber-coupled diode-pumped, monolithic, passively Q-switched Nd:YAG/Cr 4+ :YAG composite ceramic laser with four-output beams, each beam containing laser pulses with 3.8 mJ energy at 0.9 ns duration, was built for the experiments. The ignition was done in one to four points, in a compact area located close to the wall of the combustion chamber. In a first set of experiments, ignition was investigated for air-methane mixtures with relative equivalence ratio λ ranging from 0.94 (rich mixtures) to 1.7 (lean mixtures) at 1 bar initial pressure. Next, the ignition of lean air-methane mixtures was studied for high initial pressures up to 8 bar. Analysis of pressure history diagrams indicates increases (within a few percent) of the maximum pressure when ignition was done in four points in comparison with ignition at one location. It is concluded that the main advantage of multipoint ignition, for this configuration, is a decrease (around 10%) in combustion time, leading to a faster combustion. Also, it has been observed that multi-point ignition widens the ignition range of λ,

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Author

Vasile, Nicolae-Tiberius (author);Pavel, Nicolaie (author)

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Engineering (Physical Sciences)