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首页> 外文会议>ASME Turbo Expo: Turbomachinery Technical Conference and Exposition >A COMPUTATIONAL TECHNIQUE TO EVALUATE THE RELATIVE INFLUENCE OF INTERNAL AND EXTERNAL COOLING ON OVERALL EFFECTIVENESS
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A COMPUTATIONAL TECHNIQUE TO EVALUATE THE RELATIVE INFLUENCE OF INTERNAL AND EXTERNAL COOLING ON OVERALL EFFECTIVENESS

机译：评估内部和外部冷却对整体效能的相对影响的计算技术

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Gas turbine hot gas path components are protected via coolant that travels through internal passageways before being ejected as external film cooling. Modern computational approaches facilitate simulation of the conjugate heat transfer that takes place within turbine components, allowing prediction of the actual metal temperature, usually nondimensionalized in the form of the overall effectiveness. Efforts aimed at improving cooling are often focused on either only the internal cooling or the film cooling; however, the common coolant flow means the internal and external cooling schemes are inextricably linked and the coolant holes themselves provide another convective path for heat transfer to the coolant. The relative influence of internal cooling, external cooling, and convection through the film cooling holes on overall effectiveness is not well understood. Computational fluid dynamics (CFD) simulations were performed in order to isolate each cooling mechanism, and thereby determine their relative contributions to overall effectiveness. The conjugate CFD model was a flat plate with five staggered rows of shaped film cooling holes. Unique boundary conditions were used to isolate the cooling mechanisms. The internal cooling was modeled with and without heat transfer on the internal surface in order to isolate the effects of plenum cooling. Convection through the coolant holes was isolated by making the inside of the film cooling holes adiabatic. This was done in order to evaluate the influence of the internal cooling provided by the cooling holes themselves. The effect of film cooling was removed through the novel use of an outlet boundary condition at the exit of each hole that allowed unaltered internal coolant flow without external coolant ejection.
机译：燃气涡轮机热气路径部件通过冷却剂保护，冷却剂在被喷射为外部膜冷却之前通过内部通道进行。现代计算方法便于模拟涡轮机部件中发生的共轭传热，允许预测实际金属温度，通常以整体有效性的形式流出。旨在改善冷却的努力通常集中在内部冷却或薄膜冷却方面;然而，普通的冷却剂流量意味着内部和外部冷却方案是不可缩放的连接，并且冷却剂孔本身提供另一个对流的传热到冷却剂的对流路径。内部冷却，外部冷却和对流通过薄膜冷却孔对整体有效性的相对影响尚不清楚。进行计算流体动力学（CFD）模拟以隔离每个冷却机制，从而确定其对整体效率的相对贡献。共轭CFD模型是平板，具有五排成型薄膜冷却孔。使用独特的边界条件来隔离冷却机构。内部冷却用内表面上的传热模拟，以分离压力气体冷却的影响。通过使薄膜冷却孔的内部绝热来分离通过冷却液的对流。这是为了评估冷却孔本身提供的内部冷却的影响。通过新颖的使用在每个孔的出口处的出口边界条件的新用途除去薄膜冷却的效果，其允许没有外部冷却剂喷射的未改变的内部冷却剂流动。

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