Aerothermal Experiments in Turbine Rim Seals

Doctoral Dissertation
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Abstract

Purge flows are necessary for ensuring that hot gasses do not penetrate the thermally sensitive rim seal and disk cavity regions of turbines. The temperature and mass flow rate of the purge air can affect the component life and aerodynamic performance of a turbine stage. Therefore it is of interest to understand the basic mechanisms that govern this complex flow problem. The present work focuses on two turbine rim seal investigations. The first focused on temperature measurements in the rim cavity region of a rotating, high-speed, low-pressure turbine as means to quantify a rim seal’s effectiveness. The seal had a realistic geometry with a small axial overlap between the stationary and rotating components. The purge flow rate was varied from 0 to 1 percent of the core mass flow rate. The results will describe the temperatures as well as the seal’s effectiveness as a function of the purge flow rate, and turbine operating point. The second was a study on the effect of purge flow on the aerodynamic performance of a turbine stage. Exit flow field surveys were taken in both a low pressure turbine stage and a high pressure turbine stage. Also a computational study was done on the low pressure turbine stage to add insight into the effect of purge flow on turbine stage performance. In addition, the computation results provide insight into the effect of purge flow on the low pressure turbine blade passage flow field.

Attributes

Attribute NameValues
URN
  • etd-12082014-113817

Author Lionel Obadiah Pittman Jr.
Advisor Scott Morris
Contributor Aleksandar Jemcov, Committee Member
Contributor John T Schmitz, Committee Member
Contributor Joshua Cameron, Committee Member
Contributor Thomas Corke, Committee Member
Contributor Scott Morris , Committee Chair
Degree Level Doctoral Dissertation
Degree Discipline Aerospace and Mechanical Engineering
Degree Name PhD
Defense Date
  • 2014-11-20

Submission Date 2014-12-08
Country
  • United States of America

Subject
  • low pressure turbine

  • Rim

  • efficiency

  • hpt

  • lpt

  • Experiments

  • Turbine

  • high pressure turbine

  • pressures

  • highly loaded turbine

  • flow angles

  • cfd

  • temperatures

  • computational fluid dynamics

  • flows

  • Aerothermal

  • Seals

  • purge

Publisher
  • University of Notre Dame

Language
  • English

Record Visibility Public
Content License
  • All rights reserved

Departments and Units

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