基于等离子体的新型燃烧室头部工作特性实验研究

Experimental Study on Working Characteristics of New Combustion Chamber Head Based on Plasma

关键词:  三维旋转滑动弧  等离子体  燃烧室头部  放电模式  光谱特性  振动温度

Key words:  Three-dimensional rotating gliding arc  Plasma  Combustion chamber head  Discharge mode  Spectral characteristics  Vibration temperature

摘要:

目前战斗机和无人机的航空发动机均面临着高空点火性能不足的困难，急需解决该问题以提高发动机性能。设计了一种基于三维旋转滑动弧的航空发动机新型燃烧室头部，该头部可以在保持原有燃烧室结构不变的基础上，实现对燃烧室的点火和助燃。进行了新型燃烧室头部的放电特性实验，分析了稳定电弧滑动（A-G）模式和击穿伴随滑动（B-G）模式两种放电模式的特点。探究了两种放电模式对振动温度的影响，以及空气流量和电压对OH，O₂，O₃，NO四种粒子光谱发射强度的影响。结果表明，B-G模式电弧的放电功率更大，达到84W，放电模式对振动温度的影响取决于空气流量和电压的变化，而光谱发射强度则是A-G模式大于B-G模式。

Abstract:

At present， the aero-engines of fighters and unmanned aerial vehicles are facing the difficulty of insufficient ignition performance at high altitude. It is urgent to solve this problem to improve the engine performance. A new type of combustor head for aero-engine based on three-dimensional rotating gliding arc is designed， which can realize ignition and combustion-supporting of the combustion chamber on the basis of keeping the original combustion chamber structure unchanged. Experiments on the discharge characteristics of the new combustion chamber head were carried out， and two discharge modes， Steady Arc Gliding （A-G） mode and Breakdown Gliding （B-G） mode， were analyzed. The effects of two discharge modes on vibration temperature and the effects of air flow and voltage on the spectral emission intensity of OH， O₂， O₃ and NO particles were studied. The results show that the discharge power of B-G mode arc is higher， reaching 84 W. The influence of discharge mode on vibration temperature depends on the variation of air flow and voltage， while the spectral emission intensity is higher in A-G mode than in B-G mode.