Heat transfer in trailing edge, wedge-shaped cooling channels under high rotation numbers

Lesley M. Wright*, Yao-Hsien Liu, Je Chin Han, Sanjay Chopra

*Corresponding author for this work

研究成果: Article

38 引文 斯高帕斯(Scopus)

摘要

Heat transfer coefficients are experimentally measured in a rotating cooling channel used to model an internal cooling passage near the trailing edge of a gas turbine blade. The regionally averaged heat transfer coefficients are measured in a wedge-shaped cooling channel (Dh = 2.22 cm, Ac = 7.62 cm2). The Reynolds number of the coolant varies from 10,000 to 40,000. By varying the rotational speed of the channel, the rotation number and buoyancy parameter range from 0 to 1.0 and 0 to 3.5, respectively. Significant variation of the heat transfer coefficients in both the spanwise and streamwise directions is apparent. Spanwise variation is the result of the wedge-shaped design, and streamwise variation is the result of the sharp entrance into the channel and the 180 deg turn at the outlet of the channel. With the channel rotating at 135° with respect to the direction of rotation, the heat transfer coefficients are enhanced on every surface of the channel. Both the nondimensional rotation number and buoyancy parameter have proven to be excellent parameters to quantify the effect of rotation over the extended ranges achieved in this study.

原文English
文章編號071701
期刊Journal of Heat Transfer
130
發行號7
DOIs
出版狀態Published - 1 七月 2008

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