旋流燃烧器空气流场特性CFD数值模拟.pdf

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1、弄DOI：10．3969／j．issn．1009-9492．2015．O1．006旋流燃烧器空气流场特性CFD数值模拟母杨培凯，庄智勇，陈伟博(1．广东江联能源环保有限公司，广东广州510640；2．华南理工大学机械与汽车工程学院，广东广州510640)摘要：一二次风配风比及其流动特性决定燃烧过程氧气供应，对旋流燃烧器燃烧质量有着决定性的影响。旋流燃烧器内部结构设计、各部件布局、二次风门开度都会影响一二次风配风比及其流动特性。CFD技术因成本低、周期短，能直观全面了解流场分布情况而在燃烧流动领域研究被广泛应用，故采用Fluent对燃烧器

2、空气流场情况进行数值模拟和分析，研究不同二次风门开度下旋流燃烧器空气流场特性。结果表明，压力最大区域主要分布在空气人口处到二次风门间、一次风管人口附近区域，随二次风门开度增大二次风门内部空气流速逐渐增大，整体平均空气压力、空气旋流强度、旋转气流存在区域不断减小，负压区存在于旋流器前端到燃烧器空气出口之间区域，维持火焰稳定，对燃烧器结构设计和实际应用起到重要指导作用。关键词：旋流燃烧器；空气流场；CFD；湍流；数值模拟中图分类号：TP391．77文献标识码：A文章编号：1009—9492(2015101—0023一o6NumericalS

3、imulationofAirFlowofTurbulentBumerBased0nFEAYANGPei—kai，ZHUANGZhi—yong，CHENWei—bo(1．GuangdongJianglianEnergyEnvironmentalProtectionCo．，Ltd．，Guangzhou510640，China；2．SchoolofMechanical＆AutomotiveEngineering，SouthChinaUniversityofTechnology，Guangzhou510640，China)Abstract：Th

4、eprimarytosecondaryairratioandcharacteristicofairflowdeterminetheoxygensupplyduringthecombustionprocessandhaveadecisiveimpactonthecombustionqualityofturbulentbume~．Allthedesignsofinnerstructure，distributionsofeverycomponentandopeningdegreesofsecondaryairdoorinfluencethep

5、rimarytosecondaryairratioandcharacteristicofairflow．CFDtechnologyiswildlyusedintheresearchofcombustionandflowsinceitslowcostandshortcycleandvisualizedacquaintanceofthewholeflowdistribution．Theflowsituationoftheturbulentburnerisnumericalsimulatedandanalyzed．Andthecharacte

6、risticsofairflowatdifferentopeningdegreesofsecondaryairdoorarestudied．Theresultsshowthatarea8fromtheairinlettothesecondaryairdoorandareasneartheinletofprimaryairtubehavethemaximumpressure．Astheopeningdegreeofsecondaryairdoorincreases，theaverageairpressureandswirlinginten

7、sityandregionofswirlingflowdecreasebutthevelocityinsidethesecondaryairdoorincreases．Theareaofnegativepressurewhichstabilizestheflameexistsbetweenswirlerandtheairoutletoftheburner．Theconclusionsplayanimportantroleinguidingthestructuredesignandpracticalapplicationofburners

8、．Keywords：turbulentburner；airflowfield；CFD；turbulence；numericalsimulation0引言气供应不足或不理想，可能是由于总进风量不足将燃料与空气