Evolution of emission species in an aero-engine turbine stator

André A.V. Perpignan, Stella Grazia Tomasello, Arvind Gangoli Rao

Research output: Contribution to journalArticleScientificpeer-review

5 Downloads (Pure)

Abstract

Future energy and transport scenarios will still rely on gas turbines for energy conversion and propulsion. Gas turbines will play a major role in energy transition and therefore gas turbine performance should be improved, and their pollutant emissions decreased. Consequently, designers must have accurate performance and emission prediction tools. Usually, pollutant emission prediction is limited to the combustion chamber as the composition at its outlet is considered to be “chemically frozen”. However, this assumption is not necessarily valid, especially with the increasing turbine inlet temperatures and operating pressures that benefit engine performance. In this work, Computational Fluid Dynamics (CFD) and Chemical Reactor Network (CRN) simulations were performed to analyse the progress ofNOx and CO species through the high-pressure turbine stator. Simulations considering turbulence-chemistry interaction were performed and compared with the finite-rate chemistry approach. The results show that progression of some relevant reactions continues to take place within the turbine stator. For an estimated cruise condition, both NO and CO concentrations are predicted to increase along the stator, while for the take-off condition, NO increases and CO decreases within the stator vanes. Reaction rates and concentrations are correlated with the flow structure for the cruise condition, especially in the near-wall flow field and the blade wakes. However, at the higher operating pressure and temperature encountered during take-off, reactions seem to be dependent on the residence time rather than on the flow structures. The inclusion of turbulencechemistry interaction significantly changes the results, while heat transfer on the blade walls is shown to have minor effects.

Original languageEnglish
Article number11
Pages (from-to)1-19
Number of pages19
JournalAerospace
Volume8
Issue number1
DOIs
Publication statusPublished - 2021

Keywords

  • Chemical reactor networks
  • Eddy dissipation concept
  • High pressure turbine
  • NO emissions

Fingerprint Dive into the research topics of 'Evolution of emission species in an aero-engine turbine stator'. Together they form a unique fingerprint.

Cite this