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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical modeling of hot gas ingestion into the rotor-stator disk cavities of a subscale 1.5-stage axial gas turbine
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Numerical modeling of hot gas ingestion into the rotor-stator disk cavities of a subscale 1.5-stage axial gas turbine

机译：小型1.5级轴流式燃气轮机转子-定子盘腔内热气吸入的数值模拟

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摘要

Both steady and unsteady Reynolds Averaged Navier-Stokes (RANS) techniques coupled with thek-εandk-ω(SST)turbulence models are utilized to study the flow characteristics and hot gas ingestion through rim seal in a subscale 1.5-stage axial gas turbine. A scalar transport equation is solved for a tracer gas to represent the coolant flow interaction with the main stream flow. To validate the numerical methodology, radial pressure and sealing effectiveness distributions are compared with the experimental data. Thek-ω(SST)turbulence model has the capability to predict secondary flow characteristics, reattachment and separation, thus leading to better agreement with the experimental data. Both radial and circumferential pressure distributions are analyzed to get deeper insight into rotationally and externally induced ingress mechanisms. The circumferential pressure peak-to-trough amplitude is significantly attenuated in the cavity region compared to annulus region. Finally, different purge flow rates and rotational speeds are examined. Results indicate that as purge flow rate increases, the static pressure in the disk cavity region raises remarkably and consequently the sealing effectiveness improves. Averaged sealing effectiveness in the rim cavity decreases linearly with the rotational speed. To visualize different mechanisms of ingestion, streamline and flow field are shown.
机译：稳态和非稳态雷诺平均Navier-Stokes（RANS）技术与thek-εandk-ω（SST）湍流模型相结合，用于研究1.5级以下轴流式燃气轮机的流动特性和通过轮辋密封的热气吸入。求解示踪气体的标量传输方程，以表示冷却剂流与主流的相互作用。为了验证数值方法，将径向压力和密封效果分布与实验数据进行了比较。 k-ω（SST）湍流模型具有预测二次流动特性，重新附着和分离的能力，因此可以更好地与实验数据吻合。分析径向和圆周压力分布，以更深入地了解旋转和外部引起的进入机制。与环形区域相比，空腔区域中的圆周压力峰谷幅度显着衰减。最后，检查不同的吹扫流速和转速。结果表明，随着吹扫流量的增加，碟形腔区域中的静压显着提高，因此密封效果得到改善。轮辋腔中的平均密封效率随转速线性降低。为了可视化摄取的不同机制，显示了流线和流场。

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