Heat Transfer in Internal Channel of a Blade: Effects of Rotation in a Trailing Edge Cooling System
文献类型：期刊论文
| 作者 | Luca Andrei; Antonio Andreini; Leonardo Bonanni; Bruno Facchini |
| 刊名 | JOURNAL OF THERMAL SCIENCE
 |
| 出版日期 | 2012 |
| 卷号 | 21期号:3页码:236,249 |
| 关键词 | Heat Transfer Trailing Edge Pedestal Rotation Number Openfoam Cfd Tlc Thermography |
| 英文摘要 | 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 instrumentation, 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 pressure side. A rotary joint ensures the pneumatic connection between the blower and the rotating apparatus; moreover 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 detailed heat transfer coefficient 2D maps on the suction side surface as well as spanwise profiles inside the pedestal ducts. |
| 公开日期 | 2013-01-07 |
| 源URL | [http://ir.etp.ac.cn/handle/311046/51761]  |
| 专题 | 工程热物理研究所_Journal of Thermal Science |
| 推荐引用方式 GB/T 7714 | Luca Andrei,Antonio Andreini,Leonardo Bonanni,et al. Heat Transfer in Internal Channel of a Blade: Effects of Rotation in a Trailing Edge Cooling System[J]. JOURNAL OF THERMAL SCIENCE,2012,21(3):236,249. |
| APA | Luca Andrei,Antonio Andreini,Leonardo Bonanni,&Bruno Facchini.(2012).Heat Transfer in Internal Channel of a Blade: Effects of Rotation in a Trailing Edge Cooling System.JOURNAL OF THERMAL SCIENCE,21(3),236,249. |
| MLA | Luca Andrei,et al."Heat Transfer in Internal Channel of a Blade: Effects of Rotation in a Trailing Edge Cooling System".JOURNAL OF THERMAL SCIENCE 21.3(2012):236,249. |
入库方式： OAI收割
来源：工程热物理研究所
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