| Citation: | ZHENG Weilin, HE Zhenyue, LIU Han, et al. Three-dimensional turbulent field characteristics in a constant-volume combustion chamber and quantification of two-dimensional observation errors[J]. Journal of Aerospace Power, 2026, 41（X）：20250472 doi: 10.13224/j.cnki.jasp.20250472
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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.
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