Heat Transfer in Two-Pass Rotating Rectangular Channels (AR=2:1) With Discrete V-Shaped and Discrete Angled Rib Turbulators
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This paper reports the heat transfer coefficients in a two-pass rotating, rectangular channel with ribs, applicable to an internally cooled turbine blade. The channel aspect ratio is 2:1. Five different turbulators are studied: 45 angled ribs, V-shaped ribs, discrete 45 angled ribs, discrete V-shaped ribs, and crossed V-shaped ribs. The ribs are placed on the leading and trailing surfaces. The Reynolds numbers range from 5000 to 40000. The corresponding rotation numbers vary from 0.21 to 0.026 for a fixed rotating speed of 550 rpm. The rib height-to-hydraulic diameter ratio (e/D) is 0.094, the rib pitch-to-height ratio (P/e) is 10, and the inlet coolant-to-wall density ratio (/) is maintained around 0.115. For each case, two channel orientations are studied, 90 and 135 with respect to the plane of rotation. The results show the V-shaped ribs and discrete V-shaped ribs have higher heat transfer enhancement than the 45 angled ribs and discrete 45 angled ribs for both rotating and non-rotating cases.
