涡轮级间燃烧室内混合与燃烧特性数值研究

杜钊; 郝颜; 龚诚; 周瑜; 江平

doi:10.7638/kqdlxxb-2025.0004

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涡轮级间燃烧室内混合与燃烧特性数值研究

研究论文 | 更新时间：2026-05-28

- 涡轮级间燃烧室内混合与燃烧特性数值研究
- Numerical study on mixing and combustion characteristics in an inter-stage turbine combustor
- 空气动力学学报 2026年44卷第3期页码：44-56
- 作者机构：
  
  1. 中国空气动力研究与发展中心空天技术研究所,绵阳,621000
  2. 南昌航空大学动力与能源学院,南昌,330063
- 作者简介：
  
  杜钊（1998—），男，河北定州人，研究方向：航空航天动力燃烧理论和技术. E-mail：934192446@qq.com
  龚诚*，副研究员，研究方向：航空发动机燃烧理论与技术. E-mail：gongcheng0903@126.com
- 基金信息：
  
  中国空气动力研究与发展中心基础和前沿技术研究基金资助项目（PJD20170176）;江西省研究生创新专项资金项目（YC2023-S728）
- DOI：10.7638/kqdlxxb-2025.0004
  中图分类号： V231.2
- 纸质出版：2026
- 稿件说明：
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杜钊, 郝颜, 龚诚, 等. 涡轮级间燃烧室内混合与燃烧特性数值研究[J]. 空气动力学学报, 2026, 44(3): 44−56.

Du Zhao, Hao Yan, Gong Cheng, et al. Numerical study on mixing and combustion characteristics in an inter-stage turbine combustor[J]. 2026, 44(3): 44-56.
杜钊, 郝颜, 龚诚, 等. 涡轮级间燃烧室内混合与燃烧特性数值研究[J]. 空气动力学学报, 2026, 44(3): 44−56. DOI： 10.7638/kqdlxxb-2025.0004

Du Zhao, Hao Yan, Gong Cheng, et al. Numerical study on mixing and combustion characteristics in an inter-stage turbine combustor[J]. 2026, 44(3): 44-56. DOI： 10.7638/kqdlxxb-2025.0004.

摘要

针对涡轮级间燃烧室内燃料/空气混合与燃烧特性展开数值研究，本文重点探讨喷注方式对混合机理的影响规律及燃烧过程的控制机制。通过引入宏观与微观混合概念，结合ANSYS Fluent软件建立数值模型，采用火焰生成流形模型模拟湍流燃烧过程，并利用输运方程分析燃料在凹腔回流区的驻留时间特性。通过对比4种不同喷注方案（前壁、顶壁、后壁及耦合喷注）对混合效率、燃烧效率及火焰稳定性的影响，发现：喷注方式显著改变燃料在凹腔回流区的驻留时间，其中后壁喷注（方案三）的燃料驻留时间最长（达4 ms以上），有利于火焰稳定；混合过程主要由对流主导的宏观混合决定，而微观混合受湍流脉动影响显著。在补燃区出口下游20 mm处，方案三的综合混合效率达98.5%，而其他方案在同一位置仅为92%～94%。燃烧性能方面，方案三在燃烧室出口处的综合燃烧效率达95.1%，较方案一（93.2%）、方案二（92.8%）和方案四（94.0%）更高，进一步验证了后壁喷注在整体燃烧性能上的优势。燃烧模式以扩散火焰为主，但强湍流导致局部熄火与再燃现象，呈现部分预混特性。凹腔回流区通过高温产物对可燃气体持续强迫点火实现火焰稳定，而燃料主要氧化释热过程发生在凹腔外主流通道。

Abstract

This study conducts a numerical investigation on fuel/air mixing and combustion characteristics in an inter-turbine combustor

with a focus on elucidating the influence mechanisms of fuel injection schemes on mixing dynamics and combustion control strategies. By introducing macro- and micro-mixing concepts

a numerical model is established using ANSYS Fluent software

where the FGM (Flamelet Generated Manifold) method is employed to simulate turbulent combustion processes. Transport equation analysis is implemented to characterize fuel residence time properties in the cavity recirculation zone. Four distinct fuel injection configurations (front-wall

top-wall

rear-wall

and coupled injection schemes) are systematically designed and compared regarding their effects on mixing efficiency

combustion efficiency

and flame stability. Results demonstrate that injection schemes significantly alter fuel residence time in the cavity recirculation zone

with rear-wall injection (Scheme 3) achieving the longest residence time (exceeding 4 ms)

which enhances flame stabilization. The mixing process is predominantly governed by convection-dominated macro-mixing

while micro-mixing shows significant dependence on turbulent fluctuations. At a position 20 mm downstream of the afterburning zone outlet

the comprehensive mixing efficiency of Scheme 3 reached 98.5%

while that of other schemes at the same location was only 92%–94%. In terms of combustion performance

the overall combustion efficiency of Scheme 3 at the combustor outlet reached 95.1%

which is higher than that of Scheme 1 (93.2%)

Scheme 2 (92.8%)

and Scheme 4 (94.0%)

further validating the advantage of its rear-wall injection in overall combustion performance. The combustion regime primarily follows diffusion flame characteristics

but strong turbulence induces local extinction and re-ignition phenomena

exhibiting partially premixed features. The cavity recirculation zone maintains flame stability through sustained forced ignition of combustible gases by high-temperature products

while the primary fuel oxidation and heat release processes occur in the mainstream channel outside the cavity. These findings provide theoretical foundations for optimizing fuel injection strategies and combustion organization design in inter-stage combustors.

关键词

Keywords

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