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| 超燃冲压发动机点火过程10kHz PLIF测量技术 |
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高龙1,2，于欣1,2，彭江波1,2，田野3，曹振1,2，钟富宇3，欧阳浩3，张善春1,2，武国华1,2，袁勋1,2，刘文备1,2
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1.哈尔滨工业大学 航天学院 可调谐激光技术国家重点实验室，黑龙江 哈尔滨 150001;2.哈尔滨工业大学 光电子技术研究所，黑龙江 哈尔滨 150001;3.中国空气动力研究与发展中心 空天技术研究所，四川 绵阳 621000
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| 摘要: |
| 应用自主研制的10kHz OH-PLIF（Planar laser-induced fluorescence）系统实现超燃冲压发动机点火过程的可视化。在直连式脉冲燃烧风洞上开展了超燃冲压发动机自点火、电火花和激光诱导等离子体三种点火方式的火焰结构演变过程OH-PLIF测试，采集了时间间隔为100μs的高分辨率火焰图像，进一步计算得到火焰OH基荧光强度和火焰面积的时间演化特性及火焰质心发展轨迹。研究发现：三种点火方式的初始火核发展时间均小于1ms；点火过程中，火焰均先沿凹腔壁面向下游传播，在斜坡附近转向上游传播，火焰质心运动速度为100~450m/s；相对其它两种点火过程，自点火存在强烈振荡现象。研究表明，高频PLIF技术是发动机点火过程可视化最有潜力的手段之一，是发动机燃烧机理和设计方法研究的重要支撑。 |
| 关键词: 高频PLIF技术 超燃冲压发动机 点火 火焰结构 火焰质心 |
| DOI：10.13675/j.cnki.tjjs.210739 |
| 分类号:V235.21 |
| 基金项目:黑龙江省自然科学基金（LH2021F028）。 |
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| 10kHz PLIF Measurement Technique for Scramjet Ignition |
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GAO Long1,2, YU Xin1,2, PENG Jiang-bo1,2, TIAN Ye3, CAO Zhen1,2, ZHONG Fu-yu3, OUYANG Hao3, ZHANG Shan-chun1,2, WU Guo-hua1,2, YUAN Xun1,2, LIU Wen-bei1,2
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1.National Key Laboratory of Science and Technology on Tunable Laser，School of Astronautics， Harbin Institute of Technology，Harbin 150001，China;2.Institute of Opt-Electronics，Harbin Institute of Technology，Harbin 150001，China;3.Aerospace Technology Institute，China Aerodynamics Research and Development Center，Mianyang 621000，China
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| Abstract: |
| The visualization of scramjet ignition process is realized by using a self-developed 10kHz OH-PLIF （Planar laser-induced fluorescence） system. The OH-PLIF tests on flame structure evolution of three ignition schemes （autoignition， spark ignition and laser-induced plasma ignition） were carried out on a direct-connect supersonic combustion facility. During the experiment， high spatiotemporal resolution OH-PLIF images with a time interval of 100μs were obtained clearly. The time evolution characteristics of flame hydroxyl fluorescence intensity and flame area were obtained by PLIF image sequence. To describe the overall movement characteristics of the flame， the centroid trajectories of flame images were calculated. The study found that the development time of initial flame kernel of each ignition method was less than 1ms. In the ignition process， the flame propagated downstream along the cavity wall， then decelerated near the cavity ramp， and finally returned to the upstream. The velocities of flame centroid ranged from 100 to 450m/s. Compared with the results of spark ignition and laser ignition， the signal of autoignition process exhibited an intense oscillatory behavior. The results show that high-speed PLIF technique is one of the most potential methods of engine ignition process visualization. Moreover， it is an important support for the study of engine combustion mechanism and design. |
| Key words: High-speed PLIF technique Scramjet Ignition Flame structure Flame centroid |
