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采用滤光成像,摒弃电弧及羽流干扰,实验获得了采用纯氮、纯氢以及氢-氮混合气为推进剂时,低功率电弧加热发动机喷管内壁面的热辐射强度分布。通过辐射强度-温度标定以及图像分析,导出了相应的温度分布。实验结果表明,喷管扩张段内壁面温度最高处位于喉道出口附近。采用不同推进剂时,喷管内壁面温度分布情况有显著区别。
Filtering imaging was used to eliminate the interference of arc and plume. The distribution of thermal radiation intensity on the inner wall of the nozzle of low-power arc-heated engine was experimentally obtained when using pure nitrogen, pure hydrogen and hydrogen-nitrogen mixture as propellant. Through the radiation intensity - temperature calibration and image analysis, the corresponding temperature distribution was derived. The experimental results show that the maximum temperature of the inner wall of the nozzle expansion section is located near the throat outlet. When using different propellants, there is a significant difference between the temperature distribution on the inner wall of the nozzle.