带缘板修型的静盘深腔型复合封严试验

doi:10.7527/S10006893.2021.26719

Abstract

Abstract:

In this study， the composite rim seal with the deep cavity in the static disc and the modified platform was investigated by measuring the CO₂ concentration. An axial and an overlapping rim seal were used as the baseline to compare and analyze the effects of the mainstream Reynolds number （0.75×10⁵-9.4×10⁵）， the sealing flow rate （flow rate ratio 0.2%-2.5%）， and rotating Reynolds number （1.6×10⁵-8.1×10⁵） on the distribution of pressure and the sealing efficiency in the disc cavity. A corresponding numerical study was also carried out to obtain detailed flow characteristics. The results show that the main flow Reynolds number significantly affected the circumferential pressure distribution in the main flow channel. With the increase of the main flow Reynolds number， the pressure in the main flow channel also increased and the gas ingestion intensified. The higher coolant flow rate was beneficial to improvement of the sealing efficiency of the disc cavity by increasing the pressure in the disc cavity， but had less effect on the pressure at the trailing edge of the vane. An improvement in the rotating Reynolds number increased the static pressure in the main flow channel and decreased the sealing efficiency of the disc cavity. Compared with the axial rim seal， the flow structure of the overlapping rim seal cavity was changed by the setting of the high-radius sealing cavity， which effectively blocks the mainstream gas inside the sealing cavity and ensures that the sealing efficiency of the low-radius cavity is above 80%. The composite rim seal structure not only guarantees the sealing efficiency of 85% at the low-radius disc cavity， but also improves the sealing efficiency at the high-radius sealing cavity. At a low sealing flow ratio （0.2%）， the sealing efficiency of the composite rim seal structure is 10% higher than the other two rim seal structures.

Key words: composite rim seal, sealing efficiency, mainstream Reynolds number, rotating Reynolds number, gas ingestion

CLC Number:

V231.3

Qingcai ZHANG, Song LIU, Qinqin WANG, Xiaoming TAN, Jingzhou ZHANG, Wen GUO. Experiment on composite rim seal with deep cavity in static disc and modified platform[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(5): 126719-126719.

Figures/Tables 22

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Experiment on composite rim seal with deep cavity in static disc and modified platform

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