Heat Transfer in a Rotating Blade-Shaped Two-Pass Channel with a Turning Vane Academic Article uri icon

abstract

  • The effect of adding a tip turning vane on the heat transfer and pressure loss of a blade-shaped two-pass cooling channel was experimentally investigated in this work. In the first passage with an aspect ratio (AR) of [Formula: see text], the coolant traveled radially outward to a 180deg blade-shaped turn. After the turn, the coolant flowed radially inward in the second passage with [Formula: see text]. The cooling channel was positioned such that the first and second passes were angled 50 and 105deg from the direction of rotation, respectively. The turning vane was designed with an oval cross section to connect the midlines of the two passages. A 45deg angled ribbed case (inline, [Formula: see text]) was studied in addition to the smooth surface case. The Reynolds number [Formula: see text] ranged from 10,000 to 45,000in the first pass and 16,000 to 73,000in the second pass. In this study, five rotational speeds (0400rpm) were considered, and the maximum inlet rotation number [Formula: see text] was [Formula: see text]. The results showed that the turning vane decreases both heat transfer and pressure loss in the cooling channel. The average overall heat transfer for the entire channel was reduced 6 and 4% by the turning vane in the smooth and ribbed cases, respectively. However, with the presence of the turning vane, the tip wall heat transfer was increased in the range of 1020% in both the smooth and ribbed cases. The rotational effect on heat transfer was found to be reduced with the presence of the vane. On the other hand, the turning vane provided 10 and 5% pressure loss reductions in the smooth and ribbed cases, respectively.

published proceedings

  • JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER

author list (cited authors)

  • Chen, I., Wright, L. M., Han, J., & Krewinkel, R.

citation count

  • 0

complete list of authors

  • Chen, I-Lun||Wright, Lesley M||Han, Je-Chin||Krewinkel, Robert

publication date

  • January 2023