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| 非旋空气对分级贫油直喷燃烧室流动和雾化影响的实验研究 |
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莫仪然1,2，蔡延青1,3，刘富强1,2,4，王凯兴1,2,4，刘存喜1,2,4，穆勇1,2,4，徐纲1,2,4
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1.中国科学院工程热物理研究所 轻型动力实验室，北京 100190;2.中国科学院大学 工程科学学院，北京 101499;3.江苏大学 流体机械工程技术研究中心，江苏 镇江 212013;4.中国科学院轻型动力创新研究院，北京 100190
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| 摘要: |
| 针对中心分级贫油直接喷射燃烧室头部，采用粒子图像测速技术、平面激光Mie散射技术以及粒径测量技术，对比研究了非旋流空气与旋流空气四种不同的进气比例对燃烧室流动特性、喷雾特性以及燃油粒径分布特征的影响。研究发现：在常温常压状态，随着非旋流空气比例的增高，中心回流区不断缩小直至消失，预燃级燃油锥角不断减小，雾化受到阻碍，主燃级射流由向主燃级偏转逐渐转为向预燃级偏转，主油破碎效果先恶化后优化。在旋流器压降为1%和2%工况下，非旋流空气对两级燃油雾化均有抑制作用，随着非旋流空气比例的升高，空气对两级燃油雾化的阻碍作用呈现先增强后削弱的趋势，在压降为3.3%工况，非旋流空气比例对燃油雾化的影响较小。结果表明：非旋流空气与旋流空气比例为1∶2时，能够得到较为良好的流场结构、燃油分布和雾化效果，综合性能较好，是最优方案。 |
| 关键词: 燃烧室 旋流 中心分级 贫油直接喷射 雾化特性 |
| DOI：10.13675/j.cnki.tjjs.21120001 |
| 分类号:V231.2 |
| 基金项目:国家科技重大专项（2017-III-0002-0026；J2019-III-0006-0049）；中国科学院青年促进会（2019147）。 |
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| Experimental Study on Effects of Non-Swirling Air on Flow and Atomization in Lean-Direct-Injection Staged Combustor |
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MO Yi-ran1,2, CAI Yan-qing1,3, LIU Fu-qiang1,2,4, WANG Kai-xing1,2,4, LIU Cun-xi1,2,4, MU Yong1,2,4, XU Gang1,2,4
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1.Key Laboratory of Light-Duty Gas-Turbine，Institute of Engineering Thermophysics，Chinese Academy of Sciences， Beijing 100190，China;2.School of Engineering Sciences，University of Chinese Academy of Sciences，Beijing101499，China;3.Research Center of Fluid Machinery Engineering and Technology，Jiangsu University，Zhenjiang 212013，China;4.Innovation Academy for Light-Duty Gas Turbine，CAS，Beijing 100190，China
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| Abstract: |
| In this paper， four different proportions of non-swirling air and swirling air in central staged Lean Direct Injection（LDI）combustor are studied. Particle image velocimetry technology， Mie scattering technology and particle size measurement technology were used to study the effect of those structures on air dynamics， spray characteristics and particle size distribution of fuel. Researches show that， under normal temperature and pressure， with the increase of the proportion of non-swirling air， the central reflux area continues to shrink until it disappears， the cone angle of pilot stage fuel continues to decrease， the atomization effect becomes worse， the main stage jet deflects gradually from the main stage to the pilot stage， and the crushing effect of main fuel deteriorates first and then optimizes. When the pressure drop of the cyclone was 1% and 2%， non-swirling air had inhibitory effect on the fuel atomization of both stages and with the increase of the proportion of non-swirling air， the hindering effect of air on fuel atomization increased and then weakened. When the pressure drop of the cyclone was 3.3%， the proportion of non-swirling air had little effect on fuel atomization. The results show that when the ratio of non-swirling air to swirling air is 1：2， better flow field structure， fuel distribution and atomization effect can be obtained， and the comprehensive performance is better， which is the optimal scheme. |
| Key words: Combustor Swirling air Central staged Lean direct injection Spray characteristics |
