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首页> 外文期刊>Aerospace science and technology >Kriging surrogate model applied in the mechanism study of tip leakage flow control in turbine cascade by multiple DBD plasma actuators
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Kriging surrogate model applied in the mechanism study of tip leakage flow control in turbine cascade by multiple DBD plasma actuators

机译：Kriging替代模型在多级DBD等离子体致动器叶栅叶尖泄漏流动控制机理研究中的应用

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摘要

The dielectric barrier discharge (DBD) plasma actuator, in which electrodes are asymmetric arranged, has already demonstrated its ability in flow control. In the present work, the configuration of multiple plasma actuators is placed at the suction side of the cascade top to realize the tip leakage control. However, massive configurations appear when the number of plasma actuators increases, resulting in the investigation of actuator configuration for tip leakage flow control becomes a challenge. The surrogate modeling approach provides a cheap and efficient method for investigating the effect of multiple plasma actuators on the tip leakage flow control. By constructing an approximation model, tip leakage mass flow rates of all configurations are obtained in the present work. What's more, the flow structures in the tip clearance controlled by the plasma actuators are explained in the process of topological analysis. The results show that the tip leakage mass flow rate is decreasing with the number of active plasma actuators increasing. However, the decreasing would reach its limits in the process of adding plasma actuators. In the analysis of flow topology, single actuator would generate a small vortex at the suction side to cause an obstacle in the tip leakage flow. While the continuous arrangements of plasma actuator is beneficial to generate a larger obstacle in the tip clearance, which resulting in a significant reduction of (m) over dot(CFD) and the promotion of C-p. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：电极不对称排列的介质阻挡放电（DBD）等离子体致动器已经展示了其流量控制能力。在目前的工作中，将多个等离子体致动器的配置放置在叶栅顶部的吸气侧，以实现尖端泄漏控制。然而，当等离子体致动器的数量增加时，出现大量的构造，导致对用于尖端泄漏流量控制的致动器构造的研究成为挑战。替代建模方法提供了一种便宜而有效的方法，用于研究多个等离子体致动器对尖端泄漏流量控制的影响。通过构造一个近似模型，在当前工作中获得了所有构造的尖端泄漏质量流率。此外，在拓扑分析过程中说明了由等离子致动器控制的尖端间隙中的流动结构。结果表明，随着有源等离子体致动器数量的增加，针尖泄漏质量流量减小。但是，在添加等离子致动器的过程中，减少量将达到其极限。在流动拓扑分析中，单个致动器会在吸力侧产生一个小的涡流，从而在尖端泄漏流中造成障碍。尽管等离子体致动器的连续布置有利于在尖端间隙中产生更大的障碍，这导致（m）相对于点（CFD）的显着减小和C-p的提升。 （C）2018 Elsevier Masson SAS。版权所有。

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