CUED Publications database

Flow disturbance environment in low pressure turbines

Cui, J and Tucker, PG (2016) Flow disturbance environment in low pressure turbines. In: UNSPECIFIED.

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Flows within the low pressure turbine are under constant disturbance. These disturbances include free stream turbulence, incoming wakes, surface roughness and so on. To achieve higher blade loading, modern blade design features a separation bubble on the suction surface under steady ow conditions. This separation bubble has to be suppressed by the flow disturbance within the real engine. Due to this advanced blade design philosophy, understanding of the disturbance environment within the low pressure turbine becomes increasingly important. Through several eddy resolving simulations, the current paper provides a broad picture of the effect of different disturbances on the ow at the midspan. The free stream turbulence, incoming wakes and surface roughness are found to be effective in suppressing the separation bubble. These disturbances generate streaky structures within the boundary layer. As these streaks travel to the separated region, they trigger earlier transition and then suppress the separation bubble.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div A > Fluid Mechanics
Div A > Turbomachinery
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:19
Last Modified: 07 Sep 2021 02:11
DOI: 10.2514/6.2016-0116