Effects of segmented layer suction and micro-vortex generator on a high-load compressor cascade performance

Ma, Shuai; Chu, Wuli; Sun, Ximing; Guo, Zhengtao; Yan, Song

doi:10.1177/0954406220980502

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…The two-equation shear stress transport (SST) k-ω eddy viscosity model was selected to model the effect of turbulent flow. Previous studies of Langtry et al, 31 Kan et al 32 and Ma et al 33 indicated that this turbulence model predicted the corner separation flows in compressor cascades with acceptable accuracy. The γ-θ transition model was introduced to simulate the SS laminar transition phenomenon observed in the previous experiments.…”

Section: Numerical Setupmentioning

confidence: 77%

Vortical characteristics of the corner separation flow in a high-speed compressor cascade

Wang

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In aero-engine compressors, corner separations cause blockage, loss generation, and flow instabilities. The aim of the current study is to gain better knowledge of the vortical structures in corner separation flows and their resultant blockage and loss. Numerical simulations at different incidences have been performed for a high-speed linear compressor cascade. First, vortical structures have been visualized with the help of the Q-criterion and eigenvector method, and those associated with the corner separation have been focused on. It was found that the corner separation occurring on either the pressure surface or suction surface corner region was characterized by a large-scale streamwise vortex, named as the corner separation vortex in this paper. The pressure-side corner separation vortex is observed at a great negative incidence initiated from a focus point on the pressure surface, while the suction-side corner separation vortex observed at all concerned incidences originated from a focus on the endwall near the suction surface. Then, the mechanism by which corner separation vortices resulted in blockage and loss has been uncovered. The results showed that low-momentum fluids inside the core region of corner separation vortices led to the flow blockage and the viscous friction between them, and mainstream was responsible for the entropy generation. One major contributor of low-momentum fluids in the suction-side corner region was an off-wall reversed-flow region which was attributed to the breakdown of the suction-side corner separation vortex. Finally, multi-vortex structures in the leading region of the suction-side corner separation at two high positive incidences have been analyzed. It was found that the horseshoe vortex influenced the formation of the suction-side corner separation vortex, which induced a multi-vortex structure, and prevented the onset location of suction-side corner separation vortex from moving upstream with the increased incidence.

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Section: Numerical Setupmentioning

confidence: 77%

Vortical characteristics of the corner separation flow in a high-speed compressor cascade

Wang

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Studies have revealed that this design can reduce the total pressure loss in a cascade by 11.2% and increase the static pressure by 9.84%. Ma et al [16] proposed a novel segmented suction slot design for blade suction sides and revealed that with increases in the incidence, the corner separation range near the suction side gradually expands along the span and chord directions. Furthermore, the separation point also continues to move forward, and before a stall occurs, this separation range always includes the corner region formed by the end-wall and the blade's trailing edge.…”

Section: Introductionmentioning

confidence: 99%

A New Segmented Suction Slot Design Based on the Performance of Compressor Cascade

Zhao

et al. 2023

International Journal of Aerospace Engineering

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To develop an effective suction slot arrangement, computational fluid dynamics simulation software and a high subsonic compressor cascade were used to simulate different suction slots. Based on the effects of various suction slots on the cascade performance under various operating conditions, a novel segmented suction slot structure Seg3 was proposed. The results of the study revealed that in the vicinity of the operating conditions ( incidence ≤ 4 ° ), a full-blade height suction slot should be installed at least 5% of the chord length downstream of the corner separation point to effectively remove the separation. For small and medium incidences, the best performance was observed for suction slot SS5, which was located at 60% of the chord length downstream of the leading edge. Analyzing the effects of SS5 and Seg3 on the cascade performance revealed that when the incidence was less than 4°, the reductions in the total pressure loss coefficients for ζsuc of SS5 and Seg3 both exceeded 8.2%. When the incidence was 4° or greater, the ζsuc increased slightly for SS5, whereas it decreased for Seg3, and the ζsuc was reduced. For a 3° incidence, for example, Seg3 reduced the ζsuc and passage blockage by 12.74% and 8.41%, respectively, and increased the static pressure rise coefficient by 18.55% from the baseline values. Thus, the segmented suction slot proposed in this paper outperformed conventional full-blade height suction slots.

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“…12. Top view of the blade with plenum and slot.Refers to the literature referenceMa et al (2021), a segmented suction slot is selected in this research.Figure13shows the distribution of the segmented suction slots. The airflow is sucked in the plenum by the five section suction slots, and the airflow out of the plenum has a 1% suction mass-flow ratio.…”

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confidence: 99%

Comparative Study of the Performance Improvement of an Axial Compressor with a Micro-Vortex Generator and a Suction Slot

2023

JAFM

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Flow control methods have been gradually applied to improve the flow field characteristics of axial compressors. However, most of the current research is focused on the cascade, and few studies have taken a compressor as the research object. Therefore, a 3.5-stage transonic axial compressor is adopted to explore the characteristics of different flow control schemes. The effects of the micro-vortex generator (MVG), segmented boundary layer suction (BLS), and combined technology (COM) on the MVG and BLS are compared by the numerical simulation method. The research results are summarized as follows. The excessive accumulated low-energy fluid in the blade passage induces the occurrence of a corner stall in the last stage stator of an axial compressor. At this time, the compressor can still work, but the performance has accelerated deterioration. The flow characteristics are effectively improved when the MVG is introduced, the stall margin improvement ΔSM and the peak efficiency improvement Δηe of the last stage are 2.1% and 1.02%, respectively. Moreover, the BLS shows advantages in removing the three-dimensional reverse flow and decreasing the total pressure loss compared with the MVG, the ΔSM of the last stage is 2.69%, and the Δηe is 1.83%. When the combined technology is applied, it shows a significant advantage in delaying the occurrence of a corner stall, and the stall margin of the last stage is improved by 2.71%. Based on a quantitative analysis method using loss sources, the three flow control schemes show significant advantages in reducing the secondary flow loss sources and the wake loss sources. Above all, the BLS shows significant advantages in reducing the total pressure loss, and the COM shows an advantage in expanding the stable operating range. The research results will provide a reference for studies of flow control methods related to reducing flow losses and widening stability margins.

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Effects of segmented layer suction and micro-vortex generator on a high-load compressor cascade performance

Cited by 3 publications

References 33 publications

Vortical characteristics of the corner separation flow in a high-speed compressor cascade

Vortical characteristics of the corner separation flow in a high-speed compressor cascade

A New Segmented Suction Slot Design Based on the Performance of Compressor Cascade

Comparative Study of the Performance Improvement of an Axial Compressor with a Micro-Vortex Generator and a Suction Slot

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