Unsteady flows of a highly loaded turbine blade with flat endwall and contoured endwall

Chen, Ziyu; Bian, Xiutao; Yuan, Xin

doi:10.1016/j.ast.2021.106989

Cited by 8 publications

(2 citation statements)

References 59 publications

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“…The total number of grid points for the single passage model is over 26 million. A literature survey 16,17 shows that the highly accurate simulation is often conducted on a single passage model and the grid nodes usually range from 20 million to 40 million for a single passage.…”

Section: Numerical Schemementioning

confidence: 99%

DES analysis on effects of variable geometry inlet orifice on a centrifugal compressor

Liu

Zhao

Song

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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A variable geometry inlet configuration can improve the off-design aerodynamic performance of a turbocharger compressor by actively modulating the internal flow field. As the core part of the configuration, the variable geometry orifice is arranged in front of the compressor inducer. Its novelty is to actively regulate the compressor inlet flow area at an off-design point without causing significant impact at the design point. In this paper, the effects of the orifice on compressor performance and internal flow field are investigated using experiments and numerical simulations. The experimental and the numerical results confirm the variable inlet configuration to be a promising method for extending the compressor operation range. The DES calculations reveal incidence angle reduction at inducer inlet, shock wave migration to a lower radius from blade tip, formation of the aft-loaded impeller, reduced difference between jet and wake flows at impeller exit, and turbulent flow enhancement in the diffuser. Based on understanding the orifice’s effects on the centrifugal compressor, a design suggestion is proposed for the variable geometry compressor of this sort.

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Section: Numerical Schemementioning

confidence: 99%

DES analysis on effects of variable geometry inlet orifice on a centrifugal compressor

Liu

Zhao

Song

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…In addition, research on controlling PV has been conducted extensively. In related previous studies, leading-edge fillets/bulbs [16,17], non-axisymmetric endwall contour-ing [18][19][20][21], boundary layer endwall fences [22], and undulated blades [23] were used as passive control devices, whereas steady jet blowing [24], pulsed jet blowing [25], air suction [26], and PAs [27] were used as active flow-control devices.…”

Section: Introductionmentioning

confidence: 99%

Active Flow Control for Passage Vortex Reduction in a Linear Turbine Cascade with Various Tip Clearance Sizes Using a Dielectric Barrier Discharge Plasma Actuator

Matsunuma

Segawa

2023

Aerospace

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In an axial-flow turbine of a jet engine used for aircraft propulsion, the passage vortex (PV) and tip leakage vortex (TLV) generated inside the blade passage deteriorate the aerodynamic performance. In this study, a dielectric barrier discharge plasma actuator (PA) was installed in the upstream endwall of the turbine cascade to suppress the PV. The effects of the presence or absence of tip clearance and the change in the size of the tip clearance on the vortex structure at the exit of the turbine cascade were observed by recording the flow velocity distributions using particle image velocimetry. In the absence of tip clearance, only the PV existed and was completely suppressed by the PA. By contrast, in the presence of tip clearance, a TLV occurred in addition to the PV. When the input voltage to the PA was varied with various tip clearance sizes, the change in the flow fields where the PV and TLV interfered was clarified. With tip clearance, the PV was suppressed as the input voltage increased; however, the TLV increased considerably. At each tip clearance size, changes in the center positions of the PV and TLV were observed at varying input voltages of the PA. With increasing input voltages of the PA, the center position of the PV moved to the pressure surface side of the tip of the adjacent blade, and the center position of the TLV moved toward the middle of the flow passage. With a larger tip clearance, the amount of movement at the center positions of both the PV and TLV increased.

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Design and Application of Turbine Cascade Partitioned Endwall Profiling

Zeng,

Jiang,

Xue

et al. 2024

J. Therm. Sci.

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Unsteady flows of a highly loaded turbine blade with flat endwall and contoured endwall

Cited by 8 publications

References 59 publications

DES analysis on effects of variable geometry inlet orifice on a centrifugal compressor

DES analysis on effects of variable geometry inlet orifice on a centrifugal compressor

Active Flow Control for Passage Vortex Reduction in a Linear Turbine Cascade with Various Tip Clearance Sizes Using a Dielectric Barrier Discharge Plasma Actuator

Design and Application of Turbine Cascade Partitioned Endwall Profiling

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