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contributor authorAndreoli, Valeria
contributor authorBraun, James
contributor authorPaniagua, Guillermo
contributor authorDe Maesschalck, Cis
contributor authorBloxham, Matthew
contributor authorCummings, William
contributor authorLangford, Lawrence
date accessioned2019-03-17T09:36:49Z
date available2019-03-17T09:36:49Z
date copyright1/21/2019 12:00:00 AM
date issued2019
identifier issn0889-504X
identifier otherturbo_141_06_061007.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4255571
description abstractOptimal turbine blade tip designs have the potential to enhance aerodynamic performance while reducing the thermal loads on one of the most vulnerable parts of the gas turbine. This paper describes a novel strategy to perform a multi-objective optimization of the tip geometry of a cooled turbine blade. The parameterization strategy generates arbitrary rim shapes around the coolant holes on the blade tip. The tip geometry performance is assessed using steady Reynolds-averaged Navier–Stokes simulations with the k–ω shear stress transport (SST) model for the turbulence closure. The fluid domain is discretized with hexahedral elements, and the entire optimization is performed using identical mesh characteristics in all simulations. This is done to ensure an adequate comparison among all investigated designs. Isothermal walls were imposed at engine-representative levels to compute the convective heat flux for each case. The optimization objectives were a reduction in heat load and an increase in turbine row efficiency. The multi-objective optimization is performed using a differential evolution strategy. Improvements were achieved in both the aerodynamic efficiency and heat load reduction, relative to a conventional squealer tip arrangement. Furthermore, this work demonstrates that the inclusion of over-tip coolant flows impacts the over-tip flow field, and that the rim–coolant interaction can be used to create a synergistic performance enhancement.
publisherThe American Society of Mechanical Engineers (ASME)
titleAerothermal Optimization of Fully Cooled Turbine Blade Tips
typeJournal Paper
journal volume141
journal issue6
journal titleJournal of Turbomachinery
identifier doi10.1115/1.4041961
journal fristpage61007
journal lastpage061007-10
treeJournal of Turbomachinery:;2019:;volume( 141 ):;issue: 006
contenttypeFulltext


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