Experimental study of the effects of heating methods on combustion characteristics in a supersonic combustor
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摘要: 采用电阻加热燃烧室直连式试验台和甲烷燃烧加热燃烧室直连式试验台，开展了来流加热方式对煤油燃料超声速燃烧室燃烧性能的影响研究。在对比试验中，燃烧室入口纯净空气来流和污染空气来流均保持总温840K、总压820kPa和马赫数2.0的条件。利用高速摄像技术拍摄了煤油燃烧可见光图像，经分析处理得到了煤油燃烧火焰向主流的传播角度。对比试验结果显示：与电阻加热试验来流相比，甲烷燃烧加热来流的燃烧室壁面压力峰值下降了3.1%~6.9%，煤油燃烧可见光火焰向主流的传播角度缩小了7.1%~12.4%。Abstract: Aiming to study the effects of vitiation species on combustion characteristics, comparative tests are conducted in a kerosene fueled supersonic combustor using an electrical heating facility and a methane combustion heating facility. For both clean and vitiated air, the total pressure and total temperature of the combustor entrance in every test are fixed at 820 kPa and 840K, and the Mach number is about 2.0. In comparative tests, combustion luminosities images are obtained using a high speed camera. Based on these images, the kerosene combustion flame-spreading angles are acquired. Experimental results indicate that, compared with the clean air, the combustor peak wall pressure decreases by 3.1%~6.9% with the methane combustion heated airflow, and the flame spreading angle decreases by 7.1%~12.4%.
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Key words:
- vitiation species /
- scramjet /
- combustion characteristic /
- flame spreading angle
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图 5 电阻加热和甲烷燃烧加热方式燃烧室冷流壁面压力对比
Figure 5. Comparison of wall pressure distribution along combustor in clean air and methane heated air (ERK=0)
图 7 甲烷燃烧加热方式燃烧室壁面压力分布
Figure 7. Combustor wall pressure distribution with vitiated air
图 10 不同试验来流时火焰基底位置对比
Figure 10. Flame base location under clean air and vitiated air condition
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