基于滑动弧的航空发动机燃烧室头部喷雾特性  

Spray characteristics of gliding arc discharge combustion dome of areo-engine combustors

作　　者：张磊[1] 于锦禄[1] 陈一 胡长淮 蒋永健 田裕 ZHANG Lei;YU Jinlu;CHEN Yi;HU Changhuai;JIANG Yongjian;TIAN Yu(Aeronautics Engineering College,Air Force Engineering University,Xi'an 710038,China;Army Aviation Research Institute,Beijing 101121,China)

机构地区：[1]空军工程大学航空工程学院,西安710038 [2]陆军航空兵研究所,北京101121

出　　处：《航空学报》2021年第3期269-283,共15页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(91741112,51776223)。

摘　　要：发明了航空发动机燃烧室滑动弧等离子体燃油裂解头部,并开展了燃油喷雾性能实验,实验研究了不同放电电压下滑动弧等离子体对燃油喷雾性能的影响规律。结果表明,实施滑动弧等离子体燃油裂解之后,初次雾化的燃油在高温电子的碰撞下高碳链的燃油分子被打断成低碳链的小分子,燃油的黏性力降低,雾化性能得到提升。随着放电电压的升高,燃油喷雾的雾化锥角增大,SMD平均值减小,不均匀系数下降,燃油喷雾的均匀性得到明显的改善。当入口空气流量为20m^(3)/h,余气系数为0.6时,未施加等离子体的燃油喷雾的雾化锥角为43°,SMD平均值为93.545 6μm,不均匀系数为0.304,当放电电压达到200V时,燃油喷雾的雾化锥角增大到75°,SMD平均值减小为89.690 6μm,不均匀系数下降到0.233。A plasma-enhanced combustion dome is developed based on the gliding arc discharge technology in areo-engine combustors,and the effect of the gliding arc plasma on fuel spray performance at different discharge voltages is studied through fuel spray performance experiments.The application of the gliding arc plasma fuel pyrolysis technology shows that the fuel molecules of high-carbon chains are broken into small molecules of low-carbon chains under the impact of high-temperature electrons,leading to decrease in viscosity and increase in atomization performance of the fuel.With the rise of the discharge voltage,the atomization angle of the fuel increases,the SMD average value of fuel atomization decreases,and the uniformity of fuel atomization is improved.When the inlet air flow is 20 m^(3)/h and the excess air coefficient is 0.6,the atomization cone angle of the fuel spray without applying plasma excitation is 43°,the average SMD 93.545 6μm and the nonuniformity coefficient 0.304.When the discharge voltage reaches 200 V,the atomization cone angle of the fuel spray increases to 75°,the average value of SMD is reduced to 89.690 6μm,and the non-uniformity coefficient drops to 0.233.

关 键 词：滑动弧放电 等离子体 燃油裂解 燃烧室头部 燃油雾化 

分 类 号：V235.1[航空宇航科学与技术—航空宇航推进理论与工程]