Combustion Enhancement by Plasma Jet Ignition in Lean Mixtures

概要

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In order to confirm the performance and characteristics of plasma jet ignition quantitatively, combustion tests were carried out by varying the governing parameters of the plasma jet ignition. Three plasma cavities of 37, 75, and 170 mm^3, two orifices with diameters of 1 and 2.5 mm, and three discharge energies of 0.3, 1.5, and 6.7 J were tested in two different types of combustion vessels with lean hydrogen-air mixtures at equivalence ratios of 0.3 and 0.4. From a series of tests, the combustion enhancement by the plasma jet ignition is revealed only in the initial stage of combustion. Then a comparing parameter for the performance of plasma jet ignition in its initial stage of combustion is proposed by comparing the pressure diagram of plasma jet ignition with that of conventional single-point center ignition. The performance and the characteristics of plasma jet ignition are revealed quantitatively by the comparing parameter.
1989-11-15