轮毂波瓣对同轴分级燃烧室燃烧不稳定性的影响

郑维新; 张志浩; 吕光普; 刘潇

doi:10.13224/j.cnki.jasp.20230668

轮毂波瓣对同轴分级燃烧室燃烧不稳定性的影响

doi: 10.13224/j.cnki.jasp.20230668

郑维新^1,,
张志浩²,
吕光普²,
刘潇^2,*, ,

1.
中国联合重型燃气轮机技术有限公司科技管理部，北京 100016
2.
哈尔滨工程大学动力与能源工程学院，哈尔滨 150001

基金项目: 国家自然科学基金（52206137）

详细信息

作者简介:
郑维新（1976-），男，高级工程师，主要从事燃气轮机/航空发动机设计研究。E-mail：zhengweixin1976@163.com

通讯作者:
刘潇（1988-），男，副教授，博士，主要从事燃气轮机低排放燃烧组织方法研究。E-mail：liuxiao_heu@163.com

中图分类号: V231；TK16
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出版历程
- 收稿日期: 2023-09-14
- 网络出版日期: 2024-05-24

Influences of the hub lobes on combustion instabilities in a coaxial staged combustor

1.
Technology Management Department，China United Gas Turbine Technology Company Limited，Beijing 100016，China
2.
College of Power and Energy Engineering，Harbin Engineering University，Harbin 150001，China

摘要

摘要:
针对同轴分级燃烧室，研究了分别向塔式旋流器的主燃1级和主燃2级轮毂添加波瓣结构时的燃烧不稳定性。通过冷态实验对比了不同燃烧室结构下冷态流场之间的差异，再应用大涡模拟方法获得了燃烧室全局释热率脉动频谱以及一个脉动周期内的涡量和释热率等参数云图的变化，借助动力学模态分解分析了不同燃烧室结构下的速度和释热率等模态。向主燃1级轮毂添加波瓣能够降低强漩涡出现的频率，释热率脉动幅值为全局平均释热率的4%，相比原型燃烧室下降了约45%，其释热率模态表现为高频小振幅。而向主燃2级添加波瓣则导致最大涡强度升高，主频为471 Hz的释热率脉动幅值达到了全局平均释热率的30%以上，还出现了周期性回火，不利于燃烧室稳定运行。
- 燃烧室 /
- 同轴分级 /
- 燃烧不稳定 /
- 大涡模拟 /
- 波瓣
Abstract:
In response to the combustion instability of a coaxial staged combustor, the addition of lobe to the first and second main stage combustion hubs of a tower swirlers was studied. The differences in cold velocity field of combustors under different structures were compared through experimental results. The large eddy simulation method was applied to obtain the global heat release rate fluctuation spectrum of the combustor, as well as the vorticity and heat release rate within a pulsation period. Finally, the velocity and heat release rates of different combustors were analyzed using dynamic mode decomposition. Adding lobes to the first main stage hub could reduce the frequency of strong vortices, and the pulsation amplitude of the heat release rate was 4% of the global average heat release rate, about 45% lower than the prototype combustor. The heat release rate mode exhibited high-frequency small amplitude. Adding lobes to the second main stage led to an increase in the maximum vortex intensity. The pulsation amplitude of the heat release rate with a main frequency of 471 Hz reached more than 30% of the global average heat release rate, and periodic flashbacks occurred, which was not conducive to the stable operation of the combustion chamber.
- combustor /
- coaxial staged /
- combustion instabilities /
- large eddy simulation /
- lobes

HTML

图 1 同轴分级模型燃烧室几何结构示意图

Figure 1. Geometric structure of the coaxial staged model combustor

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图 2 三级塔式旋流器轮毂波瓣结构示意图

Figure 2. Hub lobe structure of a three-stage tower swirler

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图 3 实验台供气系统及测量系统示意图

Figure 3. Gas supply system and measurement system for the experimental platform

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图 4 不同结构燃烧室时均速度及矢量场

Figure 4. Time averaged velocity and vector field with different structures

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图 5 不同结构燃烧室时均速度分布

Figure 5. Time-averaged velocity distribution in different combustors

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图 6 不同结构燃烧室瞬时流场结构

Figure 6. Instantaneous flow field structure in different combustors

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图 7 不同燃烧室结构瞬时涡量分布包络线

Figure 7. Envelope lines of instantaneous vorticity distribution in different combustors

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图 8 实验与数值模拟不同轴向位置处轴向速度的对比

Figure 8. Axial velocity of experimental and numerical simulations at different axial positions

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图 9 不同结构燃烧室释热率脉动频谱

Figure 9. Fluctuation spectrum of heat release rate in combustors with different structures

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图 10 不同燃烧室结构下一个周期内的涡量云图分布

Figure 10. Vorticity contours in one period for different combustors

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图 11 不同燃烧室结构下一个周期内的混合分数云图分布

Figure 11. Mixture fraction contours in one period for different combustors

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图 12 不同燃烧室结构下一个周期内的温度云图分布

Figure 12. Temperature contours in one period for different combustors

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图 13 不同燃烧室结构下一个周期内的释热率云图分布

Figure 13. Heat release rate contours in one period for different combustors

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图 14 不同燃烧室结构下速度脉动的前4阶空间模态

Figure 14. The first four spatial modes of velocity pulsation for different combustors

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图 15 不同燃烧室结构下温度脉动的前4阶空间模态

Figure 15. The first four spatial modes of temperature pulsation for different combustors

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图 16 不同燃烧室结构下释热率脉动的前4阶空间模态

Figure 16. The first four spatial modes of heat release rate pulsation for different combustors

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