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An Innovative Pin Fin Design for Turbine Trailing Edge Cooling

机译：涡轮后缘冷却的创新销鳍设计

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Heat transfer and pressure drop measurements have been performed for two gas turbine vane trailing edge cooling designs. An additive manufacturing-enabled design, a circular pin fin with clearance with a center-body (PFC) was compared to a standard circular pin fin (PF) design with identical streamwise (X/D=1) and spanwise (S/D=2) spacing. Test pieces were additively manufactured using Stereolithography (SLA). Heat transfer experiments were conducted in a turbine vane trailing edge in a low speed linear cascade at two different freestream turbulence levels relevant to gas turbines (Tu=6.1% and 14.3%). Infrared (IR) thermography was used to measure the surface temperature of the trailing edge on the suction side of the vane, and overall cooling effectiveness or the non-dimensional metal temperature (Φ) was estimated. Results show that the PFC design has slightly higher (～2.5% for high Tu and ~6% for low Tu) area-averaged overall cooling effectiveness values than the PF design. Higher coolant mass flow rates resulted in higher overall effectiveness values. Higher freestream turbulence showed higher overall effectiveness values. The PFC design has more uniform Φ in the region with the center-body than the PF design in corresponding locations, implying the PFC design would have less thermal stress compared to the PF design. Pressure drop measurements were performed and the designs showed comparable pressure drop. Hence, it is concluded that to have the same heat transfer, the PFC design would require less coolant than the PF design with less thermal stress and no additional pressure drop.
机译：已经对两种燃气轮机叶片后缘冷却设计进行了传热和压降测量。将具有增材制造功能的设计，带有中心体（PFC）间隙的圆形销钉翅片与标准的圆形销钉翅片（PF）设计进行了比较，标准的圆形销钉翅片（PF）在流向（X / D = 1）和跨向（S / D = 2）间距。使用立体光刻法（SLA）附加地制造了测试件。在与燃气轮机相关的两种不同的自由流湍流水平下，在低速线性叶栅的涡轮机叶片后缘中进行传热实验（Tu = 6.1％和14.3％）。使用红外（IR）热像仪测量叶片吸入侧后缘的表面温度，并估算整体冷却效率或无因次金属温度（Φ）。结果表明，PFC设计的面积平均总体冷却效率值比PF设计略高（高Tu时约为2.5％，低Tu时约为6％）。较高的冷却液质量流量导致较高的总体有效性值。较高的自由流湍流显示较高的整体效率值。与PF设计在相应位置相比，PFC设计在中心体区域具有更均匀的Φ，这意味着PFC设计与PF设计相比将具有较小的热应力。进行了压降测量，并且设计显示出相当的压降。因此，可以得出结论，为具有相同的热传递，PFC设计将比PF设计需要更少的冷却剂，并且具有更少的热应力且没有额外的压降。

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