摘要
对爆轰燃气准确有效地检测可以为探索爆轰形成机理以及提升爆轰发动机工作效率提供数据支撑。提出了基于可调谐半导体激光吸收光谱技术结合双光路互相关算法的气液两相爆轰燃气速度、温度和组份浓度同时在线测量方法，针对口径80 mm无阀式脉冲爆轰发动机设计并搭建了双光路光学测试系统，通过50 kHz高频扫描1343 nm波段H2 O吸收谱线完成对爆轰燃气速度、温度及 H2 O气体浓度的在线诊断。测试结果表明光学测试系统可以实现对瞬态爆轰过程燃气变化特征的细致分析，单个爆轰过程持续时间为85ms，爆轰循环过程中爆轰波速度最高达到1172·183;s-1，爆轰燃气最高温度达到2412K ，爆轰燃气中 H2 O气体浓度维持在0～7％之间；爆轰过程中出现了短暂的速度平台与温度平台。
The effect detection of detonation exhaust can provide measurement data for exploring the formation mechanism of detonation ,the promotion of detonation efficiency and the reduction of fuel waste .Based on tunable diode laser absorption spec-troscopy technique combined with double optical path cross-correlation algorithm ,the article raises the diagnosis method to real-ize the on-line testing of detonation exhaust velocity ,temperature and H2 O gas concentration .The double optical path testing system is designed and set up for the valveless pulse detonation engine with the diameter of 80 mm .By scanning H2 O absorption lines of 1343nm with a high frequency of 50 kHz ,the on-line detection of gas-liquid pulse detonation exhaust is realized .The re-sults show that the optical testing system based on tunable diode laser absorption spectroscopy technique can capture the detailed characteristics of pulse detonation exhaust in the transient process of detonation .The duration of single detonation is 85 ms un-der laboratory conditions ,among which supersonic injection time is 5.7 ms and subsonic injection time is 19.3 ms .The valveless pulse detonation engine used can work under frequency of 11 Hz .The velocity of detonation overflowing the detonation tube is 1 172 m ＆#183; s-1 ,the maximum temperature of detonation exhaust near the nozzle is 2 412 K .There is a transitory platform in the velocity curve as well as the temperature curve .H2 O gas concentration changes between 0-7% during detonation under experi-mental conditions .The research can provide measurement data for the detonation process diagnosis and analysis ,which is of sig-nificance to advance the detonation mechanism research and promote the research of pulse detonation engine control technology .
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2014年第3期582-586,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(11372141)
国家自然科学青年科学基金项目(11002074)
高等学校博士学科点专项科研基金项目(20113219120045)
中央高校基本科研业务费专项(30920130112007)资助
关键词
光谱吸收率
洛伦兹线型拟合
互相关算法
Absorption spectrum
Lorentz fitting
Cross-correlation algorithm
