摘要
航空发动机工作时,其燃烧室内发生的复杂物理化学变化会导致发动机尾气静电带电。为研究这种静电带电的机理及其变化规律,理论分析了发动机喷流尾气中带电粒子的产生演化过程和影响因素。在讨论对比多种测试原理与传感器方案的基础上,确立了非接触式静电感应测试方法,研制了共轴喇叭状静电传感器和静电监测系统以及相应的自动测试软件。试验研究了某型航空发动机的尾气静电带电现象,获得了大量喷流尾气静电信号,同时验证了所开发测试平台的有效性。研究结果表明:航空发动机正常工作时,喷流尾气中带电粒子总体显正极性,平均体电荷密度随发动机转速和燃烧室温度的升高而增大,最大体电荷密度可达0.077 nC/m3;发动机获得的等效电流为2.26 nA,由此产生的电晕放电频次可达14 kHz。
The complex physical and chemical reactions in the combustion chamber of operating aero-engine induce electrification of aero-engine exhaust. In order to research the mechanism and principle of this phenomenon, we theoreti- cally analyzed the formation and evolution of the charged particles in aero-engine exhaust as well as some influencing factors. Furthermore, aider comparatively analyzing current electrostatic test principles and sensor schemes, we developed a special electrostatic sensor, an electrostatic monitoring system, and the corresponding automatic monitoring program. With these tools, we conducted field tests on a practical engine of aircraft which provided a large amount of exhaust gas electrostatic signal, and verified the proposed measures. The results indicate that the exhaust gas of a working aero-engine is positively charged, and its average volume charge density increases with engine speed and the temperature in combus- tion chamber. The max volume charge density reaches up to 0.077 nC/m3, which corresponds to an equivalent charging current of 2.26 nA, and a corona discharge frequency of 14 kHz caused by aero-engine exhaust electrification.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第9期2678-2684,共7页
High Voltage Engineering
基金
国家自然科学基金(61172035)
国防预研基金(编号略)~~
关键词
航空发动机
尾气静电
静电监测
非接触式测试
静电传感器
动态测量
aero-engine
exhaust electrification
electrostatic monitoring
non-contact testing
electrostatic sensor
dy- namic measurement
