基于激光吸收光谱技术的PDE管内燃气测试

Exhaust diagnostics in PDE tube based on absorption spectrum technology

脉冲爆轰发动机（PDE）是通过爆轰产生动力的新型发动机。对其工作循环中的燃气变化进行测量,进一步分析PDE的工作状态,能够提高PDE的工作效率。采用波分复用技术,搭建了光纤分布式测量系统,对PDE完整工作循环中管内不同位置处温度和燃气组分H2O浓度进行了测试与分析,结合燃烧转爆轰、爆轰波后燃气喷射、爆轰燃烧废气排空和填充进程各个不同阶段对温度及H2O浓度变化特征及原因进行了分析。实验分析填充系数对PDE稳定爆轰形成的影响。实验结果表明,在填充系数不低于84%时,PDE管内方可出现爆轰。

Pulsed detonation engine（ PDE） exhaust diagnostics in a working cycle is accomplished based on absorption spectrum technology. A distributed optical fiber measurement system is built by using the wavelength division multiplexing technology. The temperature and H2 O concentration during the whole working cycle were tested and analyzed in different positions in the tube. Combined with different stages,such as deflagration to detonation Transition,exhaust injection after detonation,exhaust evacuation and filling process,characteristics and trend of temperature and H2 O concentration curve is analyzed. The influence of PDE fill factor on detonation pressure of PDE was studied. The influence of fill factor on detonation pressure of PDE was also studied. The experimental results show that stable detonation can form under the filling factor of more than 84%.