| 摘要: |
| 为研究火炬式点火器旋转液膜冷却的冷却机理,设计了气氧/酒精火炬式点火器,并在冲压发动机试车台上进行了试验,试验中设置的最长工作时间20 s,总流量变化范围8~40 g/s,获得了压力、燃烧室下游壁面附近温度等试验数据,并通过与相似结构以液氢为燃料的试验结果进行对比,得到了如下定性结论:在一定余氧系数下,液体燃料沿壁面旋转进入火炬点火器燃烧室时,若液体燃料沸点较低(如液氢),则燃烧室下游燃烧产物为气态;若液体燃料沸点较高(如酒精),则燃烧室下游燃烧产物核心部分为气态,周围为液态。 |
| 关键词: 火炬式点火器 设计 试验 液膜冷却 |
| DOI： |
| 分类号:V434.3 |
| 基金项目:国家自然科学基金(50376072) |
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| Experiment on gas-oxygen/ethanol spark torch igniter |
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LIU Wei1, YANG Tao2, HU Jian-xin3, LI Li4, YU Ning5
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1.Inst.of Aerospace and Material Engineering,National Univ.of Defence Technology,Changsha 410073,China;2.Inst.of Aerospace and Material Engineering,National Univ.of Defence Technology,Changsha 410074,China;3.Inst.of Aerospace and Material Engineering,National Univ.of Defence Technology,Changsha 410075,China;4.Inst.of Aerospace and Material Engineering,National Univ.of Defence Technology,Changsha 410076,China;5.Inst.of Aerospace and Material Engineering,National Univ.of Defence Technology,Changsha 410077,China
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| Abstract: |
| In order to study the mechanism of rotation liquid film cooling on the spark torch igniter,a new spark torch igniter with the fuel of gas-oxygen/ethanol was developed.Hot-fire tests were finished on the ramjet test system.The longest time duration was set to be 20 seconds and total mass flow rate was set to be between 8~40 g/s.The pressure and temperature of combustion resultants near the combustion chamber wall were obtained.A conclusion was obtained through analyzed similar structure in which the liquid fuel of liquid hydrogen was ejected into the combustion chamber from tangential injectors and under a certain excess-oxidizer coefficient,the region near the combustion chamber wall was filled with liquid fuel if the boiling point of the liquid fuel is relatively high(e.g.ethanol),and was filled with gas products if the boiling point of the liquid fuel is relatively low(e.g.liquid hydrogen). |
| Key words: Spark torch igniter Design Test Liquid film cooling |
