摘要
在空气静止、气压为12 kPa(对应超声速风洞试验段的气压)条件下,研究射频放电等离子体的光谱特性;在马赫数为2的超声速来流中,研究射频放电等离子体激励对激波/边界层干扰非定常性的控制效果.实验结果表明:在相同的激励频率下,随着加载功率的增大,表征电子温度的相对光谱强度增大,而表征振动温度和电子密度的相对光谱强度基本保持不变;保持加载功率不变,随着激励频率的增大,表征电子温度的相对光谱强度先增大后减小,而表征振动温度和电子密度的相对光谱强度没有明显变化.在未施加激励时,激波振荡的主导频率为低频;在施加射频放电等离子体激励后,激波低频振荡减弱,高频振荡增强,激波特征频率从低频转向高频,再附边界层出现高能量漩涡结构.
The spectral characteristics of radio frequency(RF)discharge plasma were studied at a static air pressure of 12 kPa(pressure corresponding to supersonic wind tunnel section).The effect of RF discharge plasma actuation on unsteadiness of shock wave/boundary layer interaction was studied in supersonic air flow with Ma of 2.The experimental results show that,the relative spectral intensity representing electron temperature rises with the increase of loading power at the same actuation frequency,while the relative spectral intensity representing vibration temperature and electron density hardly changes.When the loading power remains unchanged,as the actuation frequency increases,the relative spectral intensity representing electron temperature increases first and then decreases,however,the relative spectral intensity representing vibration temperature and electron density doesn’t change significantly.The dominant frequency of shock wave oscillation is low frequency without plasma actuation.After applying radio frequency discharge plasma actuation,the low-frequency oscillation of shock wave is weakened and the high-frequency oscillation is strengthened;the characteristic frequency of shock wave changes from low frequency to high frequency;high-energy vortex appears in the boundary layer.
作者
蔡帮煌
宋慧敏
郭善广
张海灯
盛佳明
CAI Bang-huang;SONG Hui-min;GUO Shan-guang;ZHANG Hai-deng;SHENG Jia-ming(Science and Technology on Plasma Dynamics Laboratory,Air Force Engineering University,Xi’an 710038,China)
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2020年第9期1839-1848,共10页
Journal of Zhejiang University：Engineering Science
基金
国家“973”重点基础研发规划资助项目(2006CB200303)
国家自然科学基金资助项目(11472306)
陕西省自然科学基础研究计划资助项目(2018JQ1011).
关键词
射频表面放电
等离子体激励
发射光谱
激波/边界层干扰
特征频率
radio frequency surface discharge
plasma actuation
emission spectrum
shock/boundary layer interference
characteristic frequency
