Fluid Mechanics and Flight Mechanics

Investigation on windage heating characteristics of labyrinth seals

  • SUN Dan ,
  • LU Jiang ,
  • LIU Yongquan ,
  • ZHAN Peng ,
  • XIN Qi
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  • 1. Liaoning Key Laboratory of Advanced Test Technology for Aerospace Propulsion System, School of Aero-Engine, Shenyang Aerospace University, Shenyang 110136, China;
    2. AECC Shenyang Engine Design and Research Institute, Shenyang 110015, China;
    3. AECC Key Laboratory for Power Transmission Technology of Aero-Engine, Shenyang 110015, China

Received date: 2018-05-21

  Revised date: 2018-06-07

  Online published: 2018-07-27

Supported by

National Natural Science Foundation of China (51675351); China Postdoctoral Science Foundation (2018M633572); Program for Higher Education Innovative Talents Support of Liaoning Province (LR2016033)

Abstract

The heat load caused by windage heating of labyrinth seals plays an important role in the cooling system for the blade of aero-engine turbines. In this paper, windage heating characteristics of labyrinth seals are systematically studied using theoretical analysis, numerical calculation and experimental research. The formula for theoretical calculation of windage heating is analyzed and the experiment bench of windage heating characteristics is designed and built. Based on labyrinth seals, a model for numerical solution of RNG(Re-Normalization Group) k-ε turbulent equation on windage heating is established. The effects of pressure ratio and rotational speed on the characteristics of windage heating are investigated. The results of the theoretical calculation, numerical simulation and experimental test are compared to analyze the flow field characteristics, leakage characteristics, and windage heating characteristics, revealing the mechanism of windage heating characteristics of labyrinth seals. The results show that the structure of high and low teeth weakens the air permeability of the labyrinth seal, enhances the dissipation of kinetic energy, and helps reduce the leakage of labyrinth seals. Under the study conditions of this article, the total temperature rise is relatively small when the rotation speed is lower than 2 000 r/min, the total temperature of airflow increases as the rotation speed increases to 2 000 r/min to 6 000 r/min, where the air temperature could maximally rise by approximately 12.87 K. The increase of pressure ratio enhances the convection heat transfer of airflow, and the temperature rise drops by 7 K as the pressure ratio increases from 1.1 to 1.3 with the rotation speed of 6 000 r/min. The main reason for windage heating is that the airflow absorbs the frictional heat generated by the abrasion between the viscous airflow through the sealing gap and the high-speed rotating rotor, and the faster the rotor rotates, the higher the temperature rises. The investigation on windage heating characteristics of labyrinth seals in this paper provides a theoretical basis for the heat load analysis of the airflow in aero-engines.

Cite this article

SUN Dan , LU Jiang , LIU Yongquan , ZHAN Peng , XIN Qi . Investigation on windage heating characteristics of labyrinth seals[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018 , 39(11) : 122348 -122357 . DOI: 10.7527/S1000-6893.2018.22348

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