Ignition experiment and numerical simulation on a combustion heater with hydrogen and oxygen
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摘要:
点火试验和数值仿真研究了氢氧燃烧加热器,对比了二组元和三组元两种不同构型的加热器性能。试验结果表明:二组元和三组元燃烧加热器均实现了“自点火”,相较于三组元燃烧加热器,二组元燃烧加热器点火延迟时间减小约17.0%。试验中二组元和三组元燃烧加热器分别稳定燃烧190 ms和189 ms,没有出现不稳定燃烧。试验和数值仿真得到的高温点火区分布类似,三组元加热器高温点火区更集中于氢气喷孔之后,二组元加热器高温点火区呈现V形。从试验喷嘴图像可见,相较于二组元燃烧加热器,三组元燃烧加热器在喷嘴出口处烧蚀的面积更大,烧蚀部位的温度更高,与数值仿真结果一致。
Abstract:Ignition experiments and numerical simulation were conducted to study a combustion heater with hydrogen and oxygen. Two different types of combustion heater, i.e: bipropellant combustion heater and tripropellant combustion heater, were studied. Both of them achieved self-ingition. Compared with the tripropellant combustion heater, the bipropellant combustion heater had shorter ignition delay time by 17.0%. The bipropellant combustion heater and tripropellant combustion heater worked stably and lasted for 190 ms and 189 ms, separately, in the experiments. The high temperature zones in the experiments and numerical simulations were similar. The high temperature zone in the tripropellant combustion heater located behind the hydrogen ignition hole, while the bipropellant combustion heater had a V-shape high temperature zone. From the experimental images of the injectors, the tripropellant combustion heater had a bigger ablation area, which was in consonance with the numerical results.
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Key words:
- combustion heater /
- hydrogen /
- injection type /
- ignition experiment /
- flame shape
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表 1 一级燃烧加热器参数
Table 1. Parameters of the first combustion heater
工况 配气压力/MPa 温度/K 喉道直径/mm 氢气 富氧空气 氢气 富氧空气 氢气 富氧空气 高温限流
喉道氧气 空气 二组元 9.39 2.49 7.65 280 280 2.4 8.0 18.7 三组元 9.50 2.54 7.80 表 2 二级燃烧加热器参数
Table 2. Parameters of the secondary combustion heater
工况 流量/(kg/s) 温度/K 等效喉道直径/mm 燃烧室尺寸/mm 喷管喉道
直径/mm氢气 氧气 氢气 氧气 氢气 氧气 长度 直径 二组元/三组元 0.03 0.342 280 280 2.62 5.14 400 120 29.68 -
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