| 摘要: |
| 一种单环腔中心分级低污染燃烧室，由中心的预燃级和外围的主燃级构成，在主预燃级之间存在一定的物理隔离(台阶高度)，为了研究主预燃级之间不同台阶高度对氮氧化物(NOx)排放的影响，在慢车工况参数下，采用单头部矩形试验件进行了污染排放测试试验，并利用Fluent商用软件进行了冷态流场和热态燃烧性能的数值模拟分析。结果表明:台阶高度对NOx排放有很大影响，当台阶高度增大38%，中心回流区表面积增大6.7%，体积增大16.4%，轴向长度有所减小，NOx排放指数升高35.1%。 |
| 关键词: 航空发动机 中心分级燃烧室 台阶高度 数值分析 |
| DOI： |
| 分类号:V231.2 |
| 基金项目: |
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| Effects of Step Height on Low Emission Stirred Swirl Combustor |
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KANG Yao,LIN Yu-zhen,FU Zhen-bo,ZHANG Chi
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(National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics/School of Energy and Power Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100191，China)
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| Abstract: |
| A single annular lean-burn internally-staged combustor consists of pilot stage and main stage.The pilot stage is located in the center-line of the combustion chamber while the main stage surrounds coaxially the pilot stage. There exists a physical isolation called step height between the two stages. The emission tests using a single module rectangular combustor were operated under the idle condition to study the effects of step height on NOx. The commercial software Fluent was used to simulate the cold flow field and combustion performance. The results indicate that step height has a great influence on the emission of NOx. When the step height increases by 38%，the surface and volume of primary center recirculation zone will increase by 6.7% and 16.4%. However，the axial length has a decrease of the small amount and the emission of [EINOx]will increase by 35.1%. |
| Key words: Aero-engine Internally-staged combustor Step height Numerical simulation |
