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mo ni tou ping ye pian chong ji leng que de shi yan yan jiu
Pages: 165-175
Year: Issue:  2
Journal: Journal of Engineering Thermophysics

Keyword:  冲击冷却试验件冲击管透平叶片凹面冲击射流Nu数半圆铝块平均换热系数;
Abstract: Presented in this paper are the experimental results of impingement cooling of two aluminuim targets of different sizer with six impingement tubes. The target simulating the leading edge of a turbine airfoil is preheated and cooled by jets of different impingement tubes at various flow rates and distances. The lumped-capacity method is used to determine the cooling rate of the aluminium target and the mean heat transfer coefficients which are in turn correlated in dimensionless parameters. Satisfactory results are obtained when Nu numbers calculated from the recommended expression are compared with those by experiments. The recommended expression is further compared with the correlated formula of Arizona State University by Metzgor and those of University of Cincinnati by Ravuri and Tabakoff together with the experimental data, and it is found that the expression correlated by this paper is more-or less reasonable.
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