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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of misalignment at 2nd vane endwall on heat transfer with purge flow
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Effect of misalignment at 2nd vane endwall on heat transfer with purge flow

机译：第二叶片端壁未对准对吹扫流动热传递的影响

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摘要

Since the domestic power plants are typically operated at a partial load rather than the design point, the thermal expansion decreases, resulting in misalignment between first stage rotor and second stage stator. In this study, we investigate the heat transfer characteristics of a misalignment under purge flow at the second stage vane endwall through heat/mass transfer experiments using the naphthalene sublimation method and CFD simulations. Experiments are conducted at 4 vanes in a linear cascade with an inlet Reynolds number of 120,000, based on the vane axial chord length. In the absence of purge flow, a high heat transfer occurs in upstream of the vane endwall via horseshoe vortices. When a misalignment occurs, a more severe thermal load is observed as the mainstream attaches to the endwall due to recircu-lation flow upstream of the leading edge. Additionally, two high heat transfer regions are observed when a step-induced vortex occurs in the vane flow path. In case of the purge flow, the mixing of the mainstream and purge flow increases the intensity of the vortex, which increases heat transfer in the region upstream of the both flat and stepped endwall. In conclusion, we have found that the step difference has a crucial effect on thermal damage upstream of the second stage vane endwall as a little misalignment occurrence. The area-averaged heat transfer of the stepped endwall is increased by about 11.4% and 13.7% without and with purge flow, respectively, as compared to that of the flat endwall.
机译：由于国内发电厂通常在部分负载而不是设计点处操作，因此热膨胀减小，导致第一级转子和第二级定子之间的未对准。在这项研究中，我们研究了通过使用萘升华方法和CFD模拟的热/传质实验在第二级叶片端壁的吹扫流动下吹扫流动的传热特性。基于叶片轴向弦长，在带有入口雷诺数为120,000的线性级联的4叶片中进行实验。在没有吹扫流动的情况下，通过马蹄涡流在叶片端壁的上游发生高传热。当发生未对准时，由于前沿上游的循环流动，主流被倾斜地连接到端壁时，观察到更严重的热载荷。另外，当在叶片流动路径中发生阶梯诱导的涡流时，观察到两个高传热区域。在吹扫流动的情况下，主流和吹扫流的混合增加了涡流的强度，这增加了平坦和阶梯式端壁上游的区域中的传热。总之，我们发现阶梯差异对第二阶段叶片端墙上的热损坏的对热损坏的关键影响，作为一点未对准发生。与扁平端壁相比，阶梯式端壁的面积平均传热分别增加了约11.4％和13.7％，而没有吹扫流动。

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