多点喷射空气酒精燃气发生器试验验证

Test verification of multi-point injection air and ethanol gas generator

为有效解决现有燃气引射气源存在的诸多缺点,适应一种引射系统大流量、小型化的需要,在综合分析各燃气引射气源方案的基础上,研制了一种以空气、酒精作为推进剂的多点喷射结构的燃气发生器,并开展了多种工况下的试验研究。结果表明:采用的多点喷射方案大大提高了空间利用率,有效满足了引射系统小型化的要求;喷雾性能好,喷雾锥角及粒径优于设计指标要求;点火可靠性高,解决了领域内现有燃气发生器点火可靠性低的缺点;点火迅速,燃烧平稳,可实现较为均匀的出口温度场;燃气发生器工作范围较宽,能在余气系数2.52~4.34范围内稳定燃烧;高效的火焰筒内壁空气冷却方式有效保证了燃气发生器长时间工作运行。

In order to effectively solve the shortcomings of the existing gas ejection source,as well as meet the needs of large mass flowrate and miniaturization of an injection system,a gas generator with multi-point injection structure using air and alcohol as propellants was developed based on the comprehensive analysis of various gas injection source schemes,and the experimental research under various working conditions was carried out.Research results show as bellows:the multi-point injection scheme greatly improves the space utilization rate,which effectively meets the miniaturization requirements of ejection system.Spray performance is good,and the spray cone angle and particle diameter are superior to the index requirements.Ignition reliability is high,which solves the shortcomings of low ignition reliability of the existing gas generator in the field.The operation curve indicates a rapid ignition,stable combustion and uniform temperature field of gas generator.The excess air coefficient range for stable operation is 2.52~4.34,showing a wide mass flow-rate range.In addition,efficient film cooling on the combustion liner inner wall effectively ensures the long time operation of the gas generator.