境界層遷移を伴う圧縮性翼列流れのLES(流体工学,流体機械)

概要

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Large-eddy simulation of compressible transitional flows in a low-pressure turbine cascade is performed by using 6th-order compact difference and 10th-order filtering method. Numerical results without free-stream turbulence and those with about 7% of free-stream turbulence are compared. In these simulations, separated-flows in a 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, unsteady pressure field essentially differs from that with strong free-stream turbulence. In the no free-stream turbulence case, pressure waves which propagate from blade's wake region have noticeable effects on the separated-boundary layer near the trailing-edge, and on the neighboring blade.
2004-12-25