OH*-chemiluminescence during autoignition of hydrogen with air in a pressurised turbulent flow reactor

摘要: Autoignition of hydrogen in air was studied a turbulent flow reactor using OH*-chemiluminescence. High-speed imaging used to visualise the formation auto-ignition kernels flow, and analyse conditions under which temporary stabilisation flame occurred. The experiments were carried out at temperatures 800-850 K, pressures 0.8-1.2 MPa an equivalence ratio phi = 0.25. Measurements autoignition delays yielded values range tau 210-447 ms. delay results indicated that, over studied, ignition reduced with decreasing pressure. This observation contradicted homogeneous gas-phase kinetic calculations, predicted increase If model altered include surface reactions walls, calculations could be qualitatively reconciled experimental data, suggesting that wall had significant influence on delays. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. (Less)