A-15 高圧-低圧タービン間の流動現象に関する数値的研究(空力II,一般講演)

概要

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With the high loading of a HP (High Pressure) turbine, it is increasingly necessary to take account of the interaction of the HP turbine and a LP turbine located downstream in a design of these turbines. In this study, complex flow phenomena between the transonic HP turbine and the LP turbine are investigated using three-dimensional unsteady (time accurate) RANS (Reynolds-Averaged Navier-Stokes) simulation. Analysis of the unsteady flow field resulting from the simulation shows that blade trailing edge shock waves interact unsteadily with the LP turbine first vanes. And the analysis shows that a main factor of loss generations within a transition duct is not the shock interactions but a mixing of vortices from HP blades such as wakes, passage vortices and tip-clearance vortices. Meanwhile, within LP turbine first vanes, the analysis shows that a steady effect arising from the upstream HP vanes wakes and an unsteady effect of the HP blades wakes, vortices and the shock waves vary inflow conditions and strengthen secondary flows and result in a loss increase.
社団法人日本ガスタービン学会の論文
2005-09-01