定容燃烧弹三维湍流场特性及二维观测误差量化分析

郑玮琳; 何振月; 刘瀚; 谢凡; 曾文

doi:10.13224/j.cnki.jasp.20250472

定容燃烧弹三维湍流场特性及二维观测误差量化分析

doi: 10.13224/j.cnki.jasp.20250472

郑玮琳^1,,
何振月¹,
刘瀚¹,
谢凡²,
曾文^1,*, ,

1.
沈阳航空航天大学航空发动机学院，沈阳 110136
2.
中国航空工业集团有限公司沈阳飞机设计研究所，沈阳 110035

基金项目: 国家自然科学基金（52506160）；辽宁省自然科学基金（2025-MS-130）

详细信息

作者简介:
郑玮琳（1989-），女，副教授，博士，主要从事燃烧室流动与反应动力学研究。E-mail：wlzheng@sau.edu.cn

通讯作者:
曾文（1977-），男，教授，博士，主要从事航空发动机燃烧过程与排放物生成的数值研究。E-mail：zengwen928@sohu.com

中图分类号: V231.1
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出版历程
- 收稿日期: 2025-10-16
- 网络出版日期: 2026-03-25

Three-dimensional turbulent field characteristics in a constant-volume combustion chamber and quantification of two-dimensional observation errors

ZHENG Weilin^1
,,
HE Zhenyue¹,
LIU Han¹,
XIE Fan²,
ZENG Wen^{1,*
, ,}

1.
School of Aero-Engine，Shenyang Aerospace University，Shenyang 110136，China
2.
Shenyang Aircraft Design Research Institute，Aviation Industry Corporation of China，Shenyang 110035，China

摘要

摘要:
为了量化定容燃烧弹（CVCC）内三维（3D）湍流场特性与二维（2D）观测结果之间的差异，采用基于滑移网格的大涡模拟（LES）方法，对不同初始压强与风扇转速组合条件下的三维瞬态流场进行数值模拟，分析火焰发展区域的速度分布、湍流强度、湍流积分尺度、流场均匀性及各向同性等关键参数，并与实验数据对比验证。研究目的在于通过定量比较二维与三维湍流流场的特征差异，揭示其差异的形成机理，为提升定容燃烧弹内湍流场调控及燃烧稳定性优化提供理论支撑。研究结果表明：与实验监测面相比，与其正交的两个监测面的湍流强度拟合公式系数的最大相对误差达到17%，湍流尺度拟合公式系数的最大相对误差达到5%，经线尺度与纬线尺度比值与其理论各向同性湍流中的2倍相差较远，表明其各向同性相比实验监测面更差。这一显著差异证实了传统基于二维投影的火焰面观测方法会引入不可忽略的测量误差，凸显了三维流场分析在燃烧诊断中的重要性。
- 定容燃烧弹 /
- 湍流强度 /
- 积分尺度 /
- 均匀性及各向同性 /
- 大涡模拟
Abstract:
In order to quantify the discrepancies between the characteristics of the three-dimensional (3D) turbulent flow field and the two-dimensional (2D) observational results within a constant-volume combustion chamber (CVCC), a numerical study was conducted using the large-eddy simulation (LES) method based on a sliding mesh technique. Simulations were performed for the 3D transient flow fields under various combinations of initial pressure and fan rotational speed. Key parameters in the flame development region, including velocity distribution, turbulence intensity, turbulence integral length scale, flow uniformity, and isotropy, were analyzed and compared with experimental data for validation. The objective of this research is to reveal the underlying mechanisms responsible for the characteristic differences between 2D and 3D turbulent flow fields through quantitative comparison, thereby providing theoretical support for enhancing turbulence control and optimizing combustion stability within CVCCs. The results indicate significant differences between the fully 3D simulated field and the 2D projection typically available from experiments. Compared to the experimentally monitored plane, the maximum relative error in the fitted formula coefficients for turbulence intensity reached 17% on the two orthogonal monitoring planes. Similarly, the maximum relative error for the turbulence length scale coefficients reached 5%. Furthermore, the ratio of the meridional to circumferential length scales deviated substantially from the theoretical value of 2 for isotropic turbulence, indicating a worse degree of isotropy compared to the experimental plane. These significant discrepancies confirm that traditional flame observation methods based on 2D projections introduce non-negligible measurement errors, highlighting the critical importance of 3D flow field analysis in combustion diagnostics.
- constant-volume combustion chamber /
- turbulence intensity /
- integral scale /
- uniformity and isotropy /
- large-eddy simulation

HTML

图 1 计算模型与网格划分

Figure 1. Computational model and mesh generation

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图 2 滑移网格交界面

Figure 2. Sliding mesh interface

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图 3 网格无关性验证

Figure 3. Mesh independence verification

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图 4 时间步长无关性验证

Figure 4. Time step independence verification

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图 5 XY、XZ与YZ三个正交监测面示例图

Figure 5. Schematic of the three orthogonal monitoring planes（XY, XZ, and YZ）

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图 6 X方向与Y方向平均速度随半径的变化规律

Figure 6. Variation of the mean X- and Y-velocity components with radius

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图 7 定容燃烧弹中心监测平面的平均速度分布云图

Figure 7. Contour plot of mean velocity on the central monitoring plane of the constant-volume combustion chamber

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图 8 湍流强度随风扇转速的变化规律

Figure 8. Variation of turbulence intensity with fan rotational speed

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图 9 经线方向与纬线方向积分尺度随风扇转速的变化规律

Figure 9. Variation of the meridional and circumferential integral length scales with fan rotational speed

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图 10 定容燃烧弹中心监测平面X方向均匀性

Figure 10. Uniformity in the X-direction on the central measurement plane of a constant volume combustion chamber

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图 11 定容燃烧弹中心监测平面Y方向均匀性

Figure 11. Uniformity in the Y-direction on the central measurement plane of a constant volume combustion chamber

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图 12 定容燃烧弹中心监测平面各向同性

Figure 12. Isotropy on the central measurement plane of a constant volume combustion chamber

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图 13 均匀性和各向同性直方图

Figure 13. Statistical distribution of flow uniformity and isotropy

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图 14 3个监测面不同初始压强下的湍流强度平均值随风扇转速变化

Figure 14. Variation of the mean turbulence intensity with fan rotational speed for the three monitoring planes under different initial pressures

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图 15 3个监测面不同初始压强下的湍流尺度平均值随风扇转速的变化

Figure 15. Variation of the mean turbulence length scale with fan rotational speed for the three monitoring planes under different initial pressures

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