Research on blending combustion characteristics of coaxial injector of oxygen/methane engine
Research on blending combustion characteristics of coaxial injector of oxygen/methane engine
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DOI：
10.1016/j.actaastro.2023.11.043
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发表时间：
2023-12
影响因子：
3.5
通讯作者：
Shao-hua Zhu;Yuan-jia Huo;Zhi-xin Zhao;Xiang-geng Wei;Bing Liu
中科院分区：
文献类型：
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作者：
Shao-hua Zhu;Yuan-jia Huo;Zhi-xin Zhao;Xiang-geng Wei;Bing Liu
针对未来可重复使用航天器对氧/甲烷火箭发动机的需求，进行了氧/甲烷同轴喷射器发动机的设计、流动混合和燃烧特性研究。研究了不同燃料-氧动量比下同轴喷射器的流场特性、火焰结构尺寸和放热状态的变化。结果表明：冷流状态下燃料氧动量比的增大增大了主流流对燃烧室内流动的影响，涡度剪切层的长度也增大；随着燃料-氧动量比的增大，火焰的上升距离逐渐减小，在剪切层中稳定火焰所需的甲烷速率是氧气的2倍以上。此时，随着该比值的增大，火焰膨胀角增大，火焰长度减小。在主放热前，回流区的丰富燃烧得到抑制，但对组分分布仍有一定影响。随着燃料氧动量比的增大，高温区起始位置逐渐推进，燃料氧动量比的增大使得主流温度变化明显加剧。在燃料氧动量比0.5 ~ 2范围内，该比值的变化对近壁气体温度分布有显著影响。然而，随着比例的增加，这种变化对气体温度的影响显着减弱。
Aiming at the demand of oxygen/methane rocket engine for future reusable spacecraft, the design of oxygen/methane coaxial injector engine and the study of flow mixing and combustion characteristics were carried out. The flow field characteristics, flame structure size and heat release state changes under different fuel-oxygen momentum ratio of coaxial injector were investigated. The results show that the increase of fuel-oxygen momentum ratio in the cold flow state increases the influence of the mainstream flow on the flow in the combustion chamber, and the length of the vorticity shear layer also increases. With the increase of fuel-oxygen momentum ratio, the flame's lifting distance gradually decreases, the rate of methane needed to stabilize the flame in the shear layer is over twice that of oxygen. At this time, as this ratio increases, the flame expansion angle increases while its length decreases. Rich combustion in the return zone is suppressed, but there is still some impact on component distribution ahead of main heat release. With the increase of fuel-oxygen momentum ratio, the starting position of the high temperature zone gradually advances, and the increase of fuel-oxygen momentum ratio makes the mainstream temperature change significantly intensified. Within a fuel-oxygen momentum ratio range of 0.5–2, the alteration of this ratio has a significant impact on the temperature profile of the gas close to the wall. However, as the ratio increases, the effect of this change on the gas temperature diminishes significantly.