Effect of Ignition Energy on the Initial Propagation of Hydrogen-Oxygen Premixed Flame

Abstract

The purpose of this study is to determine the effect of changes in the ignition energy and hydrogen volume percentage of a hydrogen oxygen combustible mixture on the Markstein length of the hydrogen flame at the beginning of ignition. A – static combustor with a diameter of approximately 60 mm and an internal volume of 350 ml was manufactured, and flame propagation images were obtained under various ignition energies and hydrogen volume percentages of the hydrogen oxygen – mixed combustible to measure the initial propagation of the flame. Using the captured images, the stretched burning velocity (<i>S_b</i>) and stretch rate (<i>K</i>) under stretch were measured. The unstretched burning velocity (<i>S_b⁰</i>) was calculated using the Chemkin code, and the effects of the ignition energy and hydrogen volume percentage of the combustible mixture were analyzed. As the hydrogen volume percentage of the combustible mixture increased, the Markstein length decreased. When the hydrogen percentage of the combustible mixture was held constant, the Markstein length decreased as the ignition energy decreased. The influence of the ignition energy increased as the hydrogen volume percentage of the combustible mixture decreased.