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Features of the Vortex Flow Structure around a One Fin Shroud

机译：一个翅片罩周围的涡流结构的特征

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Modern gas turbines have high efficiency. A further increase in their economic efficiency can be achieved, on the one hand, by enhancing the accuracy of the parameter prediction at the design stage and, on the other hand, by the possibility of improving the design for different components of the flow path based on the results of calculating the complicated viscous spatial structure of the flow. One of the tools for enhancing the efficiency of gas turbines is the minimization of the rotor-tip leakage, the rate of which is reduced by shrouding the rotor blades. In particular, using numerical methods and software tools based on the former, one can perform thorough computational analysis of the vortex structure of the flow in the vicinity of the tip shroud and sufficiently accurately determine the rotor-tip leakage rates and other parameters of the stage. Such an approach allows a more accurate assessment of the leakage than semiempirical approaches used in practice. In particular, the assessment by the correlation dependence showed that the leakage rate for the tip shroud design in question with a tip clearance of 5 mm exceeded the leakage rate calculated using the method that considers the specific features of the tip shroud design and the vortex structure of the flow in the vicinity of it by 8.65%. As exemplified by the last-stage rotor blade of a stationary gas turbine, the possibility of controlling the leakage of the main flow through the tip clearance is demonstrated based on results of a numerical experiment.
机译：现代燃气轮机具有高效率。一方面，可以通过在设计阶段提高参数预测的准确性，另一方面可以通过改进基于流道的不同组件的设计来实现其经济效率的进一步提高。计算复杂的流动粘性空间结构的结果。用于提高燃气轮机效率的工具之一是最小化转子尖端泄漏，通过覆盖转子叶片可以降低其泄漏率。特别是，使用基于前者的数值方法和软件工具，可以对叶尖导流罩附近的流动涡流结构进行全面的计算分析，并可以充分准确地确定转子叶尖的泄漏率和该级的其他参数。 。与实践中使用的半经验方法相比，这种方法可以更准确地评估泄漏。尤其是，通过相关性相关性进行的评估表明，所考虑的尖端护罩设计的泄漏率（尖端间隙为5 mm）超过了使用考虑了尖端护罩设计和涡流结构特定特征的方法计算出的泄漏率流量的8.6％。如固定式燃气轮机的末级转子叶片所例示的，基于数值实验的结果证明了控制通过叶尖间隙的主流泄漏的可能性。

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