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61.
Relight of jet engines at high altitude is difficult due to the relatively low pressure and temperature of inlet air. The penetration of initial flame kernel affects the ignition probability in the turbine engine combustor greatly. In order to achieve successful ignition at high altitude, a deeper penetration of initial flame kernel should be generated. In this study, a Gliding Arc Plasma Jet Igniter(GAPJI) is designed to induce initial flame kernel with deeper penetration to achieve successful ... 相似文献
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为了加深对激光支持的脉冲等离子体推力器工作过程的认识,本文对有无陶瓷隔离板和不同初始电压下的激光支持的脉冲等离子体推力器进行了实验研究。利用放电伏安特性对比了放电特性参数和性能参数,然后利用结合窄带滤光镜的高速摄影技术揭示了性能差异背后的物理过程变化。结果表明,陶瓷隔离板可以有效避免放电电弧对工质的烧蚀,这可以抑制滞后烧蚀的产生,从而提高推力器的推进性能。对激光烧蚀产生的工质的电离和加速是在多次振荡放电过程中进行,而不像理想电流片模型那样只电离和加速一次。放电通道内工质的电离和加速效果最为显著的时间为放电的第2个半周期。随着初始电压的增加,单位放电能量产生的推进性能先增加后趋于平稳,然后继续增加。单位放电能量产生的推进性能在初始电压高于2050V后得到较大的提高,通过放电等离子体图像推测,这意味着附着等离子体电弧的存在对推力器性能的提高有重要影响。 相似文献
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Tiangang LUO Jiajian ZHU Mingbo SUN Rong FENG Yifu TIAN Qinyuan LI Minggang WAN Yongchao SUN 《中国航空学报》2023,36(7):378-387
The ignition process and flame propagation with ethylene fuel in cavity-stabilized scramjet by a Multi-Channel Gliding Arc(MCGA) at Mach 2.0 were investigated. Effects of equivalence ratios on the MCGA-assisted ignition process and flame propagation of the scramjet were recorded by two high-speed cameras from different view angles. The discharge characteristics of MCGA are also collected synchronously with the high-speed cameras. The distributions of temperature, velocity, and equivalence ratios... 相似文献
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介绍在CAAA的FD04电孤风洞上进行的翼前缘防热材料烧蚀试验结果.试验模型由高温陶瓷制成,后掠角53°,高75 mm,长55 mm,前缘半径2 mm,对称截面半锥角为5°.试验设备包括20 MW电弧加热器、混合室、矩形超声速喷管、试验段、轨道模拟系统及真空系统等.使用的矩形超声速喷管的马赫数为3.6,以3个台阶的轨道模拟翼前缘热环境,试验时间为77.0 s.试验结果表明高温陶瓷具有优良的抗烧蚀性能,两件试验模型在试验过程中均未出现破损现象,试验还得到了翼前缘模型试验过程中的内部温度响应. 相似文献
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