基于滑动弧的航空发动机燃烧室头部喷雾特性

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20 m³/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 6 μm，不均匀系数为0.304，当放电电压达到200 V时，燃油喷雾的雾化锥角增大到75°，SMD平均值减小为89.690 6 μm，不均匀系数下降到0.233。

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

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 m³/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 6 μm and the non-uniformity 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 6 μm, and the non-uniformity coefficient drops to 0.233.