Experimental Study on Spark Ignition of Non-premixed Hydrogen Jets  

作　　者：Jin Guo Changjian Wang Manhou Li Qize He 

机构地区：[1]School of Chemical Engineering,Anhui University of Science and Technology [2]State Key Laboratory of Fire Science,University of Science and Technology of China

出　　处：《Journal of Thermal Science》2014年第4期354-358,共5页热科学学报（英文版）

基　　金：Supported by the Fundamental Research Funds for the Central Universities;National Natural Science Foundation of China(No.50806071)and(No.51276177)

摘　　要：The leaks of pressurized hydrogen can be ignited if an ignition source is within a certain distance from the source of the leaks, and jet ftres or explosions may take place. In this paper, a high speed camera was used to investigate the ignition kernel development, ignition probability and flame propagation along the axis of hydrogen jets, which leaked from a 3-ram-internal-diameter nozzle and were ignited by an electric spark. Experimental results indicate that for successful ignition events, the ignition delay time increases with an increase of the distance between the nozzle and the electrode. Ignitable zone of the hydrogen jets is underestimated if using the predicted hydrogen concentration along the jets centerline. The average rate of downstream flame decreases but that of the upstream flame increases with the electrode going far from the nozzle.

关 键 词：HYDROGEN Spark ignition Ignition kernel Ignition probability Flame propagation 

分 类 号：TK16[动力工程及工程热物理—热能工程]