A marine gas turbine switching device is taken as the research object.When the baffle of the switching device is at 30％opening degree,the flow law and loss mechanism of the switching device under the transition condition of the reversible turbine are studied.The mesh encryption setting is carried out according to the baffle,upper and lower endwalls,the mechanical arm and the rib structure above the baffle.Then the mesh independence verification is carried out.Finally,the numerical simulation study was conducted.It is found that under the transition condition,the loss of forward runner is symmetrical large-scale vortex caused by the gap between the baffles and the recirculation zone formed at the lower wall,and the loss of the backward runner is the local low-energy fluid recirculation zone behind the connecting rod caused by the flow around the mechanical arm.
关键词
可倒车燃气轮机/切换机构/过渡工况/流动结构/损失机理
Key words
reversible gas turbine/switching device/transition working condition/flow structure/loss mechanism
维普
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