Large Eddy Simulation of a Low Pressure Turbine Cascade

Ooba, Yoshinori; Kodama, Hidekazu; Arakawa, Chuichi; Matsuo, Yuichi; Fujiwara, Hitoshi; Yamamoto, Makoto

doi:10.2514/6.2003-1213

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…As most of LES of T106 blade concern either the T106A airfoil or the low-speed tests in open literature, it is difficult to compare quantitatively the current results to investigations of other authors. Nevertheless, a discrepancy on the time-average static pressure field on the suction side is observed in Raverdy et al [20], Ooba et al [54], Matsuura and Kato [22] and Funazaki et al [23] by comparison to experimental data or DNS results.…”

Section: Performancesmentioning

confidence: 98%

Numerical investigations of separation-induced transition on high-lift low-pressure turbine using RANS and LES methods

Marty

2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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International audienceAt low Reynolds numbers, laminar-turbulent transition occurs on the suction side of high-lift low-pressure turbine blades. The prediction of this flow is an important step in low-pressure turbine design. Thus the laminar-turbulent transition must be modeled or resolved. The flow around the high-lift low-pressure turbine blade T106C is predicted using RANS simulations, without and with transition model, and Large-Eddy Simulations (LES). Large-eddy simulations are performed in order to predict the laminar separation bubble without any laminar-turbulent transition modeling. Only two Reynolds numbers are investigated with LES and the current study concerns also the validation of the turbulent random flow generation technique of Smirnov et al. [1]. Reynolds number and freestream turbulence effects are studied using the analysis of the unsteady behavior of the separated shear layer and the bubble. The steady flow predicted by RANS simulation with transition model and by the time-averaged LES are in good agreement with isentropic Mach number distribution at midspan, except for the lowest Reynolds number (Re 2is = 80 000). For this last case, the separation and transition points are predicted downstream of the experimental points. The spectral analysis of LES results at different locations allows determining specific frequencies of physical mechanisms. Large-eddy simulations are able to predict laminar separation bubble over the high-lift low-pressure turbine blade T106C as RANS simulation with transition model and to capture the Kelvin-Helmholtz instability which is the cause of the transition mechanism

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Section: Performancesmentioning

confidence: 98%

Numerical investigations of separation-induced transition on high-lift low-pressure turbine using RANS and LES methods

Marty

2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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Large-Eddy Simulation of Compressible Transitional Cascade Flows with and without Incoming Free-Stream Turbulence

Matsuura

Kato

2006

JSME international journal. Ser. B, Fluids and thermal engineer

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Large-eddy simulation of compressible transitional flows in a low-pressure turbine cascade is performed by 6th-order compact difference and 10th-order filtering method. Numerical results without free-stream turbulence and those with about 5% free-stream turbulence are compared. In these simulations, separated flows in the turbine cascade accompanied by laminar-turbulent transition are realized, and the present results closely agree with past experimental measurements in terms of the static pressure distribution around the blade. In the case where no free-stream turbulence is taken into account, the unsteady pressure field essentially differs from that with strong free-stream turbulence. In the case of no free-stream turbulence, pressure waves that propagate from the blade's wake region have appreciable effects on the separated-boundary layer near the trailing edge and on the neighboring blade.

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Large Eddy Simulation of a Low Pressure Turbine Cascade

Cited by 2 publications

References 5 publications

Numerical investigations of separation-induced transition on high-lift low-pressure turbine using RANS and LES methods

Numerical investigations of separation-induced transition on high-lift low-pressure turbine using RANS and LES methods

Large-Eddy Simulation of Compressible Transitional Cascade Flows with and without Incoming Free-Stream Turbulence

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