上海交通大学学报

上海交通大学学报

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不同流速下双旋流微混扩散燃烧的火焰及流动干涉研究

  

  1. 1.上海交通大学 动力机械及工程教育部重点实验室，上海 200240；

    2.中国联合重型燃气轮机技术有限公司，北京 100016
  • 作者简介:孙雨昂（2004—），本科生，从事能源与动力工程研究。

Flame and Flow Interference in Dual-Swirl Micro-Mixed Diffusion Combustion at Different Flow Velocities

  1. 1. Key Laboratory of Power Machinery and Engineering of the Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China; 2. China United Gas Turbine Technology Co., Ltd., Beijing 100016, China

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摘要： 为研究微混扩散燃烧的级间旋流干涉问题，针对一种新型的双旋流微混扩散燃烧器，本研究采用粒子图像测速（PIV）实验和OH*荧光成像实验对计算流体力学（CFD）模型进行验证，再通过Fluent对该燃烧器在不同流速下的燃烧过程进行仿真模拟。根据计算结果对其旋流火焰、流场的干涉问题进行了详细研究，结果表明：值班级射流与主燃级射流之间存在明显的干涉现象，流速从30 m/s增大到60 m/s会使热态流动干涉的起始位置提前7.8%、火焰干涉的起始位置延迟20.3%；流速的增大会使火焰高度增加，干涉的发生会使火焰张角和中央回流区的颈部宽度增大；流速的增大还会显著影响干涉区的掺混效果，尤其会使得值班级射流的混合均匀性变差。研究表明火焰干涉与流动干涉是相互影响的，并会导致NOx排放的增大。

关键词: 喷嘴通道速度, 双旋流, 火焰/流动干涉, 微混燃烧

Abstract:

In order to study the interstage cyclonic interference problem in micro-mixed diffusion combustion, in this investigation, particle image velocimetry (PIV) experiments and OH* fluorescence imaging experiments were used to verify the computational fluid dynamics (CFD) model. Subsequent simulations of the burner's combustion process at various flow velocities were conducted with Fluent. The calculation results comprehensively analyzed the interference phenomenon between the swirl flame and the flow field. It was observed that significant interference exists between the pilot stage jet and the main stage jet. The increase in flow velocity from 30 m/s to 60 m/s led to an advancement of the interference onset position in the hot state flow by 7.8%, in the cold state flow by 5.2%, and a delay in the interference onset position in the flame by 20.3%. Additionally, the flame height was noted to increase with the flow velocity, and the interference was found to expand the flame angle and the neck width of the central recirculation zone. Furthermore, the increase in flow velocity was identified to substantially impact the mixing effect within the interference zone, particularly deteriorating the mixing uniformity of the pilot stage. Research shows that flame interference and flow interference affect each other and will lead to an increase in NOx emissions.

Key words: Flow velocity, dual-swirl, flame/flow interference; micro-mixed combustion

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