Heat Transfer and Flow Phenomena in a Swirl Chamber Simulating Turbine Blade Internal Cooling
Heat Transfer and Flow Phenomena in a Swirl Chamber Simulating Turbine Blade Internal Cooling
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DOI：
10.1115/98-gt-466
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发表时间：
1998-06
影响因子：
1.6
通讯作者：
C. R. Hedlung;P. Ligrani;H. Moon;B. Glezer
中科院分区：
文献类型：
--
作者：
C. R. Hedlung;P. Ligrani;H. Moon;B. Glezer
传热和流体力学的结果给出了涡流室的几何模型的内部通道用于冷却的涡轮机叶片的前缘。根据进气道特性，研究的雷诺数包括与应用中相同的数值（18000-19400）。对于传热测量，涡流室的入口和壁之间的绝对空气温度的比率范围从0.62到0.86。利用红外热成像技术结合热电偶、能量平衡、数字图像处理和原位校准程序测量了涡流室表面努塞尔数沿着的空间变化。从流动显示图中可以清楚地看到沿沿着凹面发展的Gortler涡对阵列的结构和流向发展。涡流室的总体结构也从速度、总压、静压的周向分量和涡量的周向分量的时间平均测量中描述。由于Gortler涡对的阵列，表面努塞尔数和时间平均流动特性的重要变化，特别是在两个入口中的每一个附近，努塞尔数最高。当气流从每个入口平流离开时，努塞尔数随之减小，并沿腔室的内表面沿着变得更加均匀。© 1998 ASME
Heat transfer and fluid mechanics results are given for a swirl chamber whose geometry models an internal passage used to cool the leading edge of a turbine blade. The Reynolds numbers investigated, based on inlet duct characteristics, include values which are the same as in the application (18000–19400). The ratio of absolute air temperature between the inlet and wall of the swirl chamber ranges from 0.62 to 0.86 for the heat transfer measurements. Spatial variations of surface Nusselt numbers along swirl chamber surfaces are measured using infrared thermography in conjunction with thermocouples, energy balances, digital image processing, and in situ calibration procedures. The structure and streamwise development of arrays of Gortler vortex pairs, which develop along concave surfaces, are apparent from flow visualizations. Overall swirl chamber structure is also described from time-averaged surveys of the circumferential component of velocity, total pressure, static pressure, and the circumferential component of vorticity. Important variations of surface Nusselt numbers and time-averaged flow characteristics are present due to arrays of Gortler vortex pairs, especially near each of the two inlets, where Nusselt numbers are highest. Nusselt numbers then decrease and become more spatially uniform along the interior surface of the chamber as the flows advect away from each inlet.© 1998 ASME