Session: 36-02 Hot Section Deposition

Paper Number: 80013

80013 - Particle Rebound/Deposition Modelling in Engine Hot Sections 

Particle Rebound/Deposition Modelling in Engine Hot Sections

 

Lei-Yong Jiang¹, Patrick Trembath², Prakash Patnaik¹ and Michele Capurro¹

¹Aerospace Research Centre, the National Research Council of Canada

²The Department of National Defence Canada

Corresponding author E-mail: lei-yong.jiang@nrc-cnrc.gc.ca

 

The aircraft engine hot section is most vulnerable and failure prone to environmental particle ingestion, particularly for helicopters.  The field experiences indicated that helicopter service time can be substantially reduced due to particle ingestion.  Therefore an analytical tool to assess this effect has to be developed.  The experimental measurements and numerical modelling of particle rebound/deposition in engine hot sections, involve complicated physical phenomena and has a rich parameter space.

In this paper, the current state of the art in experimental and analytical research on environmental particle ingestion related to engine hot sections was reviewed, with greater emphasis focussed on sand particles.  From these efforts, the available experimental data for model calibration were identified, and a novel particle rebound/deposition model has been developed.  A semi-empirical approach is selected to model sand particles bouncing off metal surfaces, where the coefficients of restitution measured in a temperature range of 297-1323 K are used to calculate particle bounce-back velocity components.  The developed deposition model is based on a non-dimensional parameter group and analysis over more than seventy experimental datasets related to particle deposition in engine hot sections.  Moreover, the metal surface temperature, one of two critical parameters in particle deposition, is also included in the model. 

The developed rebound/deposition model was successfully implemented into the ANSYS CFD Premium solver and checked step by step.  The model is calibrated by two cases: sand [or Arizona road dust (ARD)] particle impingement on a circular plate and Mt. St. Helens volcanic ash (comparable with ARD particles in terms of chemical composition) impinging on a first-stage air-cooled nozzle guide vane (NGV).  For the former case, the calibrated model predicts fairly well the variation of particle capture efficiencies with flow/particle temperatures.  The latter case indicates that the particle capture efficiency at engine operating conditions can be assessed by the developed model.  Due to the lack of experimental data that would permit a full calibration/validation, for the time being it could be only used under limited conditions.  Certainly, the model will be continuously improved as the relevant experimental data appears. 

Presenting Author: Lei-Yong Jiang the National Research Council of Canada

Presenting Author Biography: Dr. Lei-Yong Jiang obtained his Ph.D. degree from Institute for Aerospace Studies University of Toronto in 1995 has been in the combustion and propulsion S&T field over 30 years, with more than 130 publications and adjunct professorships from two Canadian universities. He is member of Combustion Fuels & Emissions Committee and the previous Chair of Coal, Biomass, Hydrogen & Alternative Fuels Committee of International Gas Turbine Institute. His research interests include gas turbine combustion, CFD applications to solve various reacting and non-reacting flow problems, impact of environmental particles to gas turbine engines, laser diagnostics, and experimental combustion.

Authors:

Lei-Yong Jiang the National Research Council of Canada
Patrick Trembath The Department of National Defence Canada
Prakash Patnaik the National Research Council of Canada
Michele Capurro the National Research Council of Canada