Analysis and improvement of flow field quality in high-load planar cascade wind tunnel

CAI Ming; WANG Limin; GAO Limin; JING Lina; WANG Lei

doi:10.7638/kqdlxxb-2023.0214

ACTA AERODYNAMICA SINICA > 2025 > 43(1): 44-52. > DOI: 10.7638/kqdlxxb-2023.0214

CAI M, WANG L M, GAO L M, et al. Analysis and improvement of flow field quality in high-load planar cascade wind tunnel[J]. Acta Aerodynamica Sinica, 2025, 43(1): 44−52. DOI: 10.7638/kqdlxxb-2023.0214

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Analysis and improvement of flow field quality in high-load planar cascade wind tunnel

CAI Ming^{1, 2,},
WANG Limin¹,
GAO Limin^2, ,,
JING Lina¹,
WANG Lei²

1.
AVIC The First Aircraft Institute, Xi’an　710089, China
2.
School of Power and Energy, Northwestern Polytechnical University, Xi’an　710072, China

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Received Date: November 19, 2023
Revised Date: January 07, 2024
Accepted Date: February 01, 2024
Available Online: November 25, 2024
Published Date: November 19, 2024

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Abstract

Abstract

High-quality flow fields in cascade wind tunnels are crucial to evaluate the aerodynamic performance of compressor cascades. This study examines the impact of different inflow conditions on the flow field quality in a planar cascade wind tunnel, utilizing a high-load compressor cascade. A suction scheme tailored to the wind tunnel’s upper end-wall is developed, and its effects on the flow field quality is investigated. The results indicate that the inflow inhomogeneity and inaccuracy of incidence angle persist across the cascade’s operational range. Notably, the measured incidence angles of the cascade passage exceed the assigned values by 2°～3°. The flow field quality deteriorates with increasing cascade load (increasing inlet Mach number and incidence angle). The incidence angle affects the inhomogeneity of the inlet Mach number and flow angle, while the inlet Mach number primarily affects the former. The upper end-wall suction can effectively improve the flow field quality at high incidence angles with appropriate suction pressure amplitudes. Under the critical suction pressure that yields the optimal flow field quality, the upstream flow field homogeneity is restored, and the difference between the measured and assigned incidence angles is reduced to 0.5°～0.9°. Both the two-dimensionality and the periodicity of the total pressure loss of the cascade are improved, but the periodicity of the outlet flow angle of the cascade remains essentially unchanged. This research provides valuable insights into improving flow field quality in cascade wind tunnels, particularly under high-load conditions.
- planar cascade wind tunnel,
- cascade test,
- compressor cascade,
- flow filed quality,
- end-wall suction

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References

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