Heat Transfer in Internal Channel of a Blade:Effects of Rotation in a Trailing Edge Cooling System

查看全文 作　　者：Luca [1]Andrei;Antonio [1]Andreini;Leonardo [1]Bonanni;Bruno [1]Facchini

机构地区：[1]Department of Energy Engineering 'Sergio Stecco',University of Florence

出　　处：《Journal of Thermal Science》索引2012年第21卷第3期,共14页

基　　金：supported by the Italian Ministry of Education,University and Research (MIUR) 摘　　要：The aerothermal performance of a trailing edge (TE) internal cooling system of a high pressure gas turbine blade was evaluated under stationary and rotating conditions.The investigated geometry consists of a 30:1 scaled model reproducing a typical wedge shaped discharge duct with one row of enlarged pedestals.The airflow pattern inside the device simulates a highly loaded rotor blade cooling scheme with a 90 [deg] turning flow from the radial hub inlet to the tangential TE outlet.Two different tip configurations were tested,the first one with a completely closed section,the second one with a 5 holes outlet surfaces discharging at ambient pressure.In order to assess rotation effects,a rotating test rig,composed of a rotating arm holding both the PMMA TE model and the instru-mentation,was purposely developed and manufactured.A thin Inconel heating foil and wide band Thermo-chromic Liquid Crystals are used to perform steady state heat transfer measurements on the blade pres-sure side.A rotary joint ensures the pneumatic connection between the blower and the rotating apparatus;more-over several slip rings are used for both instrumentation power supply and thermocouple connection.A parallel CFD analysis involving steady-state RANS modeling was conducted to allow an insight of the flow field inside the redirecting channel and the interpedestal ducts to better interpret the developing vortical structures.Low-Reynolds grid clustering permits to integrate up to the wall both the momentum and the thermal boundary layer.Calculations were performed by means of an in-house developed pressure based solver exploiting the k-ω SST turbulence model implemented in the framework of the open-source finite volume discretization toolbox OpenFOAM?.Analyzed flow conditions correspond to Reynolds number of 20000 in the hub inlet section and angular speed varies to obtain rotation numbers in the range from 0 to 0.3.The orientation of the rotation axis is orthogonal to the heated surface as to resemble a 90 [deg] blade metal angle.Results are reported in terms of de-tailed heat transfer coefficient 2D maps on the suction side surface as well as spanwise profiles inside the pedestal ducts. 关键词：旋转接头冷却系统刀片通道聚甲基丙烯酸甲酯传热 TE模型流体力学分析

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Heat Transfer in Internal Channel of a Blade:Effects of Rotation in a Trailing Edge Cooling System

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