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Effects of Gas-Ingestion Through Turbine Rim Seals on Flow and Heat Transfer in the Wheel-Space

[+] Author Affiliations
Shuqing Tian, Ying Zhang, Wei Su

AVIC Commercial Aircraft Engine Co., Ltd., Shanghai, China

Paper No. GT2014-26635, pp. V05CT16A036; 11 pages
doi:10.1115/GT2014-26635
From:
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 5C: Heat Transfer
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4573-8
  • Copyright © 2014 by ASME

abstract

This paper presents numerical simulations of the gas-ingress into turbine wheel-space through the rim seal. The objective is to reveal the physical mechanism of gas-ingress flow in the wheel-space and its effects on the heat transfer in the cavity. Firstly, the wheel-space without mainstream passage is simulated to get the baseline of the case without ingress, and the windage heat in the cavity is investigated. Secondly, the gas-ingestion is conducted, and its effects on the flow and heat transfer in the wheel-space are studied.

The results reveal that in the absence of ingress into the wheel-space, the windage heating pays an important contribution to the stator/rotor temperatures because of the high rotational speed of the engine. When ingress occurs, the ingested gas mixes with the sealing air at the seal clearance and then inward flows into the wheel-space along the stator wall, and thus leads to the stator wall heated. The rotor wall is relatively less heated by the invaded gas than the stator wall because of the thermal buffering of the sealing air on the rotor wall. The thermal buffer ratio, which is defined as the ratio of the sealing effectiveness on the stator wall to that on the rotor wall, is shown dependent on the sealing flow rate. It is increased as the sealing flow rate increases.

Copyright © 2014 by ASME

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