| 基于丙酮/CH2O双组分PLIF技术的横向声波激励预混火焰未燃区/预热区特性研究 |
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| 引用本文： | 闫博,孙永超,朱家健,吴戈,万明罡,田轶夫,陈爽,孙明波.基于丙酮/CH2O双组分PLIF技术的横向声波激励预混火焰未燃区/预热区特性研究[J].实验流体力学,2022,36(2):139-145. |
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| 作者姓名： | 闫博 孙永超 朱家健 吴戈 万明罡 田轶夫 陈爽 孙明波 |
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| 作者单位： | 1.国防科技大学 高超声速冲压发动机技术重点实验室，长沙 410073 |
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| 基金项目： | 国家重点研发计划（2020YFA0405700）；国家自然科学基金（51606217，91741205）；湖南省创新型省份建设专项（2019RS2028） |
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| 摘 要： | 热声不稳定问题是航空航天动力装置发展中的难题之一，针对预混燃烧火焰的热声不稳定机理研究是解决实际发动机热声振荡难题的必经之路。采用丙酮/CH2O双组分PLIF同步测量技术对横向声波激励下的预混火焰特性进行了研究，获得了横向声波激励预混燃烧火焰中的未燃区/预热区分布变化情况。实验结果表明:随着激励声波声压级的增大和激励声波频率的减小，未燃区/预热区形貌的变化逐渐增强；同时，随着激励声波相位的变化，未燃区/预热区形貌呈周期性变化。对丙酮PLIF图像进行边界提取，获取了不同声波频率、声压级条件下的未燃区抬举高度、扩散面积。利用丙酮/CH2O双组分PLIF同步测量成功捕捉到典型声波频率、声压级下的火焰形貌演化过程，并分析了该典型工况下的火焰熄灭现象及其机制。
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| 关 键 词： | 丙酮/CH2O双组分PLIF 声波激励 预混燃烧 混合特性 火焰形貌 |
| 收稿时间： | 2021-08-31 |
Investigation of unburned/preheated area characteristics of a premixed flame under transverse acoustic excitation based on acetone and CH2O PLIF technology |
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| Affiliation: | 1.Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China2.China Aerodynamics Research and Development Center, Mianyang 621000, China |
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| Abstract: | The thermoacoustic instability is one of the most difficult problems in the development of aerospace propulsion systems. The research on the thermoacoustic instability mechanism of premixed flame can be useful to realize and solve the thermoacoustic oscillation problems of the practical engines. The characteristics of the premixed flame excited by acoustic wave are investigated by the simultaneous acetone/CH2O planar laser-induced fluorescence（PLIF） technique, and the variation of unburnt zone and preheating zone is acquired. It is shown that the effect of the acoustic wave on the flame is more obvious at lower frequency and higher Sound Pressure Level （SPL）. As the frequency decreases and SPL increases, the change of the flow structure gradually aggravates. It is also found that the morphology of unburned zone/preheating zone changes periodically with the acoustic wave phase. The edge of acetone PLIF images is extracted, and the dependence of the lifting height, diffusion area of the premixed gas on the acoustic wave frequency and the SPL is obtained. The evolution process of the flame morphology under typical acoustic frequency and pressure level is acquired by the simultaneous acetone/CH2O PLIF images. The phenomenon and mechanism of combustion flameout under typical acoustic condition are analyzed. |
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