PHOTOCHEMICAL IGNITION OF PREMIXED HYDROGEN/OXYGEN MIXTURES WITH ARF LASER

被引:32
作者
LAVID, M
NACHSHON, Y
GULATI, SK
STEVENS, JG
机构
[1] Energia, Inc., Princeton, NJ 08542
关键词
IGNITION; LASERS; PHOTOCHEMISTRY; HYDROGEN; FREE RADICALS;
D O I
10.1080/00102209408935357
中图分类号
O414.1 [热力学];
学科分类号
摘要
The current work seeks to determine the feasibility of using radicals to improve the combustion of propulsion systems fueled by hydrogen. An ArF excimer laser (193 nn) with focused optics was used to photodissociate molecular oxygen in hydrogen/oxygen mixtures, producing ground-state atomic oxygen, O(P-3). In these experiments, the laser penetrated more than 20 cm into the mixture, there producing a maximum atomic oxygen concentration which leads to pure photochemical ignition. The minimum laser pulse energy required for ignition has been determined over a range of equivalence ratios (0.2 to 2.0) and initial temperatures (400 to 520 degrees C) at a baseline pressure of 0.5 atm. Based on these values, the atomic oxygen concentration produced in the focal volume has been calculated. For these conditions, both the minimum Laser energy and atomic oxygen concentration decrease strikingly as the initial mixture temperature increases. Results from a simplified ignition model agree with the experimental data. Both show only a weak dependence of the atomic oxygen concentration required for ignition on the equivalence ratio of the mixture over the ranges studied.
引用
收藏
页码:231 / 245
页数:15
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