预燃式等离子体射流点火器工作特性实验研究

为解决发动机点火包线小于飞行包线的实际问题,提供等离子体点火技术在航空发动机中的工程应用新思路,论文设计了一种预燃式等离子体射流点火器,实验研究了放电特性和射流特性。结果表明,预燃式等离子体射流点火器与空气等离子体射流点火器相比,在提升射流能量降低电源功率方面有着较大的优势,电流相同时通入甲烷在较大流量时可减小驱动电源功率,总流量为44L/min时,减幅可达14.99%；同时预燃式等离子体射流较空气等离子体射流稳定,且射流长度增加,扩大了点火面积,有利于点火。

Experimental Investigation on Working Characteristics of Pre-Combustion Plasma Jet Ignitor

In order to solve the practical problem that the ignition envelope of the engine is narrower than the flight envelope and provide a new approach for the engineering application of plasma ignition technology in the aeroengine, a kind of pre-combustion plasma jet ignitor was designed. The discharge characteristics and jet characteristics were investigated experimentally. The results show that compared with the air plasma jet ignitor, the pre-combustion plasma jet ignitor has a greater advantage in improving the jet energy and reducing the power supply. When the current is the same, the driving power can be reduced when methane is introduced in a large flow rate. When the total flow rate is 44L/min, the reduction can reach 14.99%. At the same time, the pre-combustion plasma jet is more stable than the air plasma jet, and the increase of jet length enlarges ignition area, which is beneficial to ignition.