Heat Transfer Characteristics of an Endwall with Single Row of Oblique Pin Fins

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The effect of a single row of oblique pin fins on the endwall heat transfer is investigated experimentally in the two types of pin fin arrangements. One is the "single row" arrangement, in which all of the pin fins are inclined toward the same direction and the other is the "cross row" arrangement, in which the pin fins are alternately inclined toward the upstream and downstream directions. Pin fins are inclined toward the streamwise direction from θ=-60 degrees (upstreamwise) to +60 degrees (downstreamwise), where θ is an angle between the axis of the pin fin and the normal of the endwall surface. The averaged Nusselt number of the oblique pin fins for the single row arrangement is smaller than that of the perpendicular pin fins, because the endwall heat transfer in the downstream region of the pin fins is not enhanced. In the case of the cross row arrangement of -30≦θ≦+30,the heat transfer shows almost the same value at the perpendicular pin fins. The cross row arrangement of θ=±30 degrees shows about 25% less pressure loss than that of the perpendicular pin fins in spite of having almost the same averaged Nusselt number.
2001-11-15