火焰清理工艺中平行多孔射流非预混燃烧的研究
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摘要
建立了远程控制燃烧试验台,研究了天然气和氧气的非预混燃烧过程,利用间接测温法分析了多孔射流燃烧火焰的温度分布规律.利用Realizable k-ε湍流模型研究平行多孔射流的流场特性,采用平衡化学反应模型研究射流的非预混燃烧过程,数值计算得出的火焰结果与试验数据吻合较好.结果表明:多孔射流的卷吸与合并能够加快气体的混合与燃烧;平行分布的45股射流在喷嘴出口附近趋于形成双孔合并,随着流动发展会发生再合并,最终表现为3股强射流火焰形态.
A remote-controlled combustion test bench was set up to investigate the non-premixed combustion process of natural gas and oxygen,and the temperature distribution of multiple jets combustion flame was analyzed by the indirect temperature measurement. The Realizable k-εturbulence model was used to study the flow field characteristics of parallel multiple jets,and the equilibrium chemical reaction model was used to study the non-premixed combustion process of jet. The numerical results have good agreement with those from the experiments. The results indicateed that the entraining and merging behaviors of multiple jets could promote the combustion action. The parallel 45 jets tend to form dual-jet combinations near the nozzle exit. Interactions and re-combinations of the jets could take place during further flow ing and eventually form 3 strong flames in the dow nstream.
A remote-controlled combustion test bench was set up to investigate the non-premixed combustion process of natural gas and oxygen,and the temperature distribution of multiple jets combustion flame was analyzed by the indirect temperature measurement. The Realizable k-εturbulence model was used to study the flow field characteristics of parallel multiple jets,and the equilibrium chemical reaction model was used to study the non-premixed combustion process of jet. The numerical results have good agreement with those from the experiments. The results indicateed that the entraining and merging behaviors of multiple jets could promote the combustion action. The parallel 45 jets tend to form dual-jet combinations near the nozzle exit. Interactions and re-combinations of the jets could take place during further flow ing and eventually form 3 strong flames in the dow nstream.
引文
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[3]Faghani E,Rogak S N. A phenomenological model of two circular turbulent jets[J]. International Journal of Engine Research,2013,14(3):293-304.
[4]Li Y M,Li B K,Qi F S,et al. Numerical investigation of the interaction of the turbulent dual-jet and acoustic propagation[J]. Chinese Physics B,2017,26(2):294-304.
[5]Li Y M,Li B K,Qi F S,et al. Flow and heat transfer of parallel multiple jets obliquely impinging on a flat surface[J]. Applied Thermal Engineering,2018,133:588-603.
[6]Marsten G F. Measurements in the flow field of a linear array of rectangular nozzles[J]. Journal of Aircraft,1980,17(11):774-780.
[7]Krothapalli A,Baganoff D,Karamcheti K. Development and structure of a rectangular jet in a multiple jet configuration[J]. AIAA Journal,1980,18(8):945-950.
[8]Pani B,Dash R. Three-dimensional single and multiple free jets[J]. Journal of Hydraulic Engineering,1983,109(2):254-269.
[9]Wang J Y,Priestman G H,Wu D D. An analytical solution for incompressible flow through parallel multiple jets[J]. Journal of Fluids Engineering,2001,123(2):407-410.
[10]Showalter M S,Nemchinsky V A,Khan J A. Fundamental study of oxygen scarfing process[J]. American Society of Mechanical Engineers,1996,323(1):233-238.
[11]Frank J H,Barlow R S,Lundquist C. Radiation and nitric oxide formation in turbulent non-premixed jet flames[J].Proceedings of the Combustion Institute,2000,28(1):447-454.
[12]Paul S C,Paul M C,Jones W P. Large eddy simulation of a turbulent non-premixed propane-air reacting flame in a cylindrical combustor[J]. Computers and Fluids,2010,39(10):1832-1847.