Numerical simulation of influence of equivalence ratio on combustion and NO<sub>x</sub> formation in a DLE combustor

SHEN Yazhou; FU Zhongguang; SHI Li; WANG Ruixin

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Numerical simulation of influence of equivalence ratio on combustion and NO_x formation in a DLE combustor

更新时间：2025-09-28

- Numerical simulation of influence of equivalence ratio on combustion and NO_x formation in a DLE combustor
- Thermal Power Generation Vol. 46, Issue 7, Pages: 46-53(2017)
- 作者机构：
  
  华北电力大学电站设备状态监测与控制教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK473
- Published：2017
- 稿件说明：
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SHEN Yazhou, FU Zhongguang, SHI Li, et al. Numerical simulation of influence of equivalence ratio on combustion and NO_x formation in a DLE combustor[J]. Thermal power generation, 2017, 46(7): 46-53.
DOI：

SHEN Yazhou, FU Zhongguang, SHI Li, et al. Numerical simulation of influence of equivalence ratio on combustion and NO_x formation in a DLE combustor[J]. Thermal power generation, 2017, 46(7): 46-53. DOI：

摘要

采用数值模拟方法研究了干式低排放(DLE)燃烧室的流场结构及不同当量比对燃烧室内燃烧及污染物生成特性的影响。结果表明:中心回流区的高温回流燃气形成稳定的点火源

保证了燃料的着火和稳定燃烧;随着当量比的增大

燃烧室内流场变化较小

整体轴向速度略有增加

回流区范围基本不变;温度场变化较大

高温区明显扩大

整体温度上升

出口截面温度分布出现不对称的现象

下半侧高温区域面积略大于上半侧;出口NO_x排放摩尔分数明显上升

整体NO_x摩尔分数迅速上升

中心回流区附近增幅最为明显;旋流器的导向作用使燃烧室温度和热力型NO_x分布不均;降解当量比对控制DLE燃烧室NO_x排放有利。

Abstract

The influence of flow field structure and equivalence ratio on combustion and pollutant emission characteristics of a dry low emission(DLE) gas turbine combustor is numerically studied. The results show that

the high temperature flow in the central recirculation establishes a firm aerodynamic base for flame stabilization. With an increase in the equivalence ratio

the flow field inside the combustor barely changes. The bulk radical velocity increases slightly

while the range of the recirculation areas barely changes. The temperature field changes greatly. The high temperature area expands significantly

and the bulk temperature rises clearly. The NO_x formation rate and NO_x concentration at the combustor outlet both shows an obvious increase.

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Related Institution

Liaoning Province Key Laboratory of Advanced Testing Technology for Aerospace Propulsion Systems, Shenyang University of Aeronautics and Astronautics

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Department of Aerospace Engineering, Shenyang University of Aeronautics and Astronautics

School of Aero Engine, Shenyang University of Aeronautics and Astronautics

China Aero Engine Gas Turbine Co., Ltd

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Numerical simulation of influence of equivalence ratio on combustion and NOx formation in a DLE combustor

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摘要

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Numerical simulation of influence of equivalence ratio on combustion and NO_x formation in a DLE combustor