火箭推进

为了研究富氢燃气与液氧之间的爆轰及补燃特性,以某发动机故障归零为依托,采用试验研究的方法,分析了非预混和预混两种情形下发生爆轰的可能性,探究了富氢燃气与液氧自动发生补燃的条件。通过分析试验现象和试验结果发现,在较低混合比和较低温度条件下富氢燃气与液氧不会自动发生补燃,火焰颜色呈无色透明状,白天不可见。管内预混状态下,富氢燃气和液氧可以发生爆轰,最大爆轰压比约34,且持续时间为毫秒级,在上游无预混物的情况下,爆轰波不会持续向上游传播。

In order to study the detonation and spontaneous combustion characteristics of hydrogen-rich gas and liquid oxygen, based on the failure analysis of a liquid rocket engine, the possibility of detonation of hydrogen-rich gas and liquid oxygen under non-premixed and premixed conditions was analyzed by means of experimental study, and the conditions of spontaneous combustion of hydrogen-rich gas were explored.Through the analysis of experimental phenomena and experimental results, it is found that the hydrogen-rich gas and liquid oxygen do not react automatically at lower mixing ratios and lower temperature conditions, and the flame color is colorless and transparent, and invisible during the daytime.Under the premixed condition, hydrogen-rich gas and liquid oxygen can detonate, the maximum detonation pressure ratio is about 34, and the duration is milliseconds.However, in the case of no premixed material upstream, the detonation wave will not continue to propagate upstream.

引言
1 试验系统
2 试验内容及结果分析
3 结论

图1 试验系统原理示意图<br/>Fig.1 Test system schematic

图1 试验系统原理示意图
Fig.1 Test system schematic

图2 试验件相关测点位置图<br/>Fig.2 Measuring point position

图2 试验件相关测点位置图
Fig.2 Measuring point position

图3 非预混状态爆轰模式示意图<br/>Fig.3 Non-premixed detonation mode schematic

图3 非预混状态爆轰模式示意图
Fig.3 Non-premixed detonation mode schematic

图4 燃气未与空气补燃时的形态<br/>Fig.4 None afterburning between burned gas with air

图4 燃气未与空气补燃时的形态
Fig.4 None afterburning between burned gas with air

图5 燃气与空气被点燃瞬间形态<br/>Fig.5 The picture of burned gas ignited

图5 燃气与空气被点燃瞬间形态
Fig.5 The picture of burned gas ignited

表1 非预混爆轰试验参数及状态<br/>Tab.1 Non-premixed detonation test parameters

表1 非预混爆轰试验参数及状态
Tab.1 Non-premixed detonation test parameters

图6 通入液氧后的火焰形态<br/>Fig.6 The picture of gas after the inflow of liquid oxygen

图6 通入液氧后的火焰形态
Fig.6 The picture of gas after the inflow of liquid oxygen

图7 预混状态爆轰模式示意图<br/>Fig.7 Premixed detonation mode schematic

图7 预混状态爆轰模式示意图
Fig.7 Premixed detonation mode schematic

图8 高频压力曲线<br/>Fig.8 High frequency pressure pulsation curve

图8 高频压力曲线
Fig.8 High frequency pressure pulsation curve

图9 爆轰瞬间火焰形态<br/>Fig.9 The picture of the flame at the moment of detonation

图9 爆轰瞬间火焰形态
Fig.9 The picture of the flame at the moment of detonation

图10 爆轰后试验件烧蚀火焰形态<br/>Fig.10 The picture of the ablative flame after detonation

图10 爆轰后试验件烧蚀火焰形态
Fig.10 The picture of the ablative flame after detonation

图11 爆轰后试验件外观<br/>Fig.11 The test product appearance after detonation

图11 爆轰后试验件外观
Fig.11 The test product appearance after detonation

图12 爆轰时压力曲线<br/>Fig.12 The pressure curve at the moment of detonation

图12 爆轰时压力曲线
Fig.12 The pressure curve at the moment of detonation

图13 燃气温度变化曲线<br/>Fig.13 The temperature curve of the gas

图13 燃气温度变化曲线
Fig.13 The temperature curve of the gas

图14 燃气压力变化曲线<br/>Fig.14 The pressure curve of the gas

图14 燃气压力变化曲线
Fig.14 The pressure curve of the gas

图15 液氧与燃气补燃瞬间<br/>Fig.15 The time of spontaneous combustion of liquid oxygen and gas

图15 液氧与燃气补燃瞬间
Fig.15 The time of spontaneous combustion of liquid oxygen and gas

图16 液氧出口小孔与燃气流相对位置示意图<br/>Fig.16 The schematic diagram of the relative position of a liquid oxygen outflow small hole and gas

图16 液氧出口小孔与燃气流相对位置示意图
Fig.16 The schematic diagram of the relative position of a liquid oxygen outflow small hole and gas

表2 小流量液氧与燃气补燃特性试验参数<br/>Tab.2 Test parameter table of the afterburning characteristics of small flow liquid oxygen andgas

表2 小流量液氧与燃气补燃特性试验参数
Tab.2 Test parameter table of the afterburning characteristics of small flow liquid oxygen andgas

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备注

引言

1 试验系统

2 试验内容及结果分析

3 结论

期刊信息