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首页> 外文会议>ASME turbo expo: turbomachinery technical conference and exposition >THE COUNTERACTIVE FLOW AND HEAT TRANSFER IN A NARROW STRAIGHT CHANNEL WITH SIDEWALL BLEEDING SLOTS
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THE COUNTERACTIVE FLOW AND HEAT TRANSFER IN A NARROW STRAIGHT CHANNEL WITH SIDEWALL BLEEDING SLOTS

机译：带有侧壁流血缝的直通道的逆流和换热。

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In the internal cooling passages of the first stage turbine blade in the modern advanced gas turbines, the dense bleeding holes are arranged in order to supply the cold air for the external film cooling. The fluid extractions dramatically vary the flow field and convective heat transfer in the internal channels. In the current work, the flow and heat transfer in a high aspect ratio channel (AR = 4) with the side wall bleeding slots are investigated. Unlike the traditional single inlet channel, the cooling air is supplied into the channel from two entrances located at the both ends of the long straight channel. Therefore, a counteractive flow pattern is generated. The effects of the flow rate ratio of the two streams (MR = m_2/m_1) on the flow and heat transfer inside the channel are investigated, where m_1 and m_2 are the flow rate of the two streams at the two entrances. The local heat transfer is found to be zigzagging with an increase in the flow rate ratio. Interestingly, once a local flow ratio, MR_x, is defined, which is based on the predicted local flow rate, all the data at different locations are converged to the same trend in the Nu/Nu_0 - MR_x space, where Nu is the measured local Nusselt number normalized with the Dittus-Boelter correlation, Nu_0. Based on the numerical simulations, the detailed flow structure is analyzed and reported. The thermal boundary conditions in the simulations mimic the heating scheme in the experiments, where the channel wall is segmented into a matrix of copper plates which are separated by the insulations. It shows that the segmental heating scheme influences the heat transfer significantly.
机译：在现代先进燃气涡轮机的第一级涡轮机叶片的内部冷却通道中，布置有密集的排气孔，以便为外部膜冷却提供冷空气。流体提取极大地改变了内部通道中的流场和对流传热。在当前工作中，研究了具有侧壁泄放槽的高纵横比通道（AR = 4）中的流动和热传递。与传统的单个进气道不同，冷却空气从位于长直通道两端的两个入口进入通道。因此，产生了反向流动模式。研究了两种流的流率比（MR = m_2 / m_1）对通道内部的流动和传热的影响，其中m_1和m_2是两种流在两个入口的流率。发现局部传热随着流量比的增加而呈锯齿状。有趣的是，一旦基于预测的局部流速定义了局部流速比MR_x，Nu / Nu_0-MR_x空间中不同位置的所有数据都将收敛到相同趋势，其中Nu是测得的局部流速用Dittus-Boelter相关系数Nu_0归一化的努塞尔数。在数值模拟的基础上，对详细的流动结构进行了分析和报告。模拟中的热边界条件模拟了实验中的加热方案，在该方案中，通道壁被分成由绝缘材料隔开的铜板矩阵。结果表明，分段加热方案对传热有显着影响。

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