Numerical investigation on effects of egress flow through different rim seals

Zhang, Qing-cai; Tan, Xiao; Wang, Qinqin; Zhang, Jingzhou

doi:10.1016/j.tsep.2023.101648

Cited by 1 publication

(1 citation statement)

References 24 publications

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“…The results demonstrated that the upper structure of the seal was the dominant characteristic of the secondary flow caused by coolant leakage flow, and the complicated lower structure of the seal can improve the sealing efficiency while leading to a more complex vortex. Several other complicated rim seal geometries have been researched by Wang et al [21], Zhao et al [22], Zhang et al [23] and other scholars; they found that the practical flow and cooling performance of different seal geometries were related to the PF ratio.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations into the Effects of Rim Seal Structure on Endwall Film Cooling and Flow Field Characteristics

Lu,

Liu,

Zhang

et al. 2023

Energies

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During the practical operation of gas turbines, relatively cooled air from the compressor and the rim seal is applied in order to prevent mainstream ingestion into the space between the rotor and stator disc cavities, which can prolong the service life of hot components. On the one hand, the purge flow from the rim seal will inevitably interact with the mainstream and result in secondary flow on the endwall. On the other hand, it can also provide an additional cooling effect. In this paper, four rim seal structures, including an original single-tooth seal (ORI), a double-tooth seal (DS), a single-tooth seal with an adverse direction of the coolant purge flow and mainstream (AS) and a double-tooth seal with an adverse direction of the coolant purge flow and mainstream (ASDS), are experimentally and numerically investigated with mass flow ratios of 0.5%, 1.0% and 1.5%. The flow orientation of the coolant from the rim seal is considered as one of the main factors. The pressure-sensitive paint technique is used to experimentally measure the film cooling effectiveness on the endwall, and flow field analysis is conducted via numerical simulations. The results show that the cooling effect decreases in the cases of DS and ASDS. AS and ASDS can achieve a better film cooling performance, especially under a higher mass flow ratio. Furthermore, the structural changes in the rim seal have little impact on the aerodynamic performance. AS and ASDS can both achieve a better aerodynamic and film cooling performance.

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Section: Introductionmentioning

confidence: 99%